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1) CT x-ray tube arcing can occur because of ___________ the x-ray tube 1. impourities in the oil outside 2. tungsten gas inside 3. tungsten solids in the oil inside

1. 1 only
2. 1 & 2
3. 2 only
4. 2 & 3

Reveal answer 2) Collimation:

1. is accomplished by electrically blocking x-rays
2. affects the scan time
3. limits the low energy x-ray photons and passes the high energy photons
4. is accomplished by physically blocking x-rays

Reveal answer 3) ______________ allows helical data to be converted into planar raw data

1. Retrospective reconstruction
2. Interpolation
3. Cone beam reconstruction
4. Convolution

Reveal answer 4) Tube arcing might cause ____________ on the images.

1. star-like artifacts at the edges
2. an increased appearance of noise
3. shading and inaccurate CT numbers
4. an appearance of a circle or ring

Reveal answer 5) Which of the following is common to both a localizer scan and a conventional, serial CT scan?

1. they both produce digital images
2. the patient table moves at a constant velocity
3. they both produce cross-sectional images
4. the x-ray tube makes complete 360° rotations

Reveal answer 6) If an algorithm to correct for the cupping artifact is applied too aggressively to the data for a head image, the _____________ of the image would be too bright. 1. top and bottom 2. center 3. edges

1. 1 only
2. 2 only
3. 3 only
4. 1 & 3

Reveal answer 7) Which of the following is TRUE regarding multi-row detector CT scanners? 1. the size of the detector arrays along the z-direction may be different. 2. the attenuation information from adjacent detector arrays may be added together to generate thicker slices 3. all of the detector arrays may or may not be used.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 8) If an image matrix has 360 rows and 360 columns, how many pixels are there in the image?

1. 21,600
2. 129,600
3. 259,200
4. 379,800

Reveal answer 9) Which of the following provides the best bone window setting for the pelvis?

1. WW 2000, WL 350
2. WW 140, WL 60
3. WW 100, WL -200
4. WW 1000, WL 200

Reveal answer 10) On a single-row detector scanner, collimation: 1. controls the slice thickness 2. minimizes the x-ray dose to the patient. 3. reduces the detection of scatter radiation.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 11) The main purpose of the detector is to:

1. provide additional collimation in order to reduce scatter
2. limit the x-ray dose to the patient
3. capture x-ray photons and convert them to a measurable signal
4. amplify the measured signal

Reveal answer 12) Which of the following is a reason for inserting a tampon in the vagina for CT exams of the female pelvis?

1. provides a high intensity on the image
2. eliminates the need for IV contrast injection
3. eliminates the need for oral contrast media
4. helps visualize the vaginal canal

Reveal answer 13) Which of the following is NOT an indication of a herniated disk? 1. deformity of the posterior border of the disk 2. displacement of epidural fat 3. hypertrophy of the inferior articulating process and lamina

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 14) If an algorithm to correct for the cupping artifact is applied too aggressively to the data for a head image, the _____________ of the image would be too bright. 1. top and bottom 2. center 3. edges

1. 1 only
2. 2 only
3. 3 only
4. 1 & 3

Reveal answer 15) ____________ in the image is a possible manifestation of patient motion. 1. ghosting 2. blurring 3. streaks

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 16) The slip ring on continuous rotation CT scanners:

1. 2. allows the exam to commence more rapidly
2. 3. eliminates the need for the reversal of gantry frame rotation
3. 1 only
4. 1, 2, & 3

Reveal answer 17) Tube interscan delay time refers to:

1. the time between the end of one scan and the state of the next scan during which the tube will cool
2. a quality assurance test performed daily by the technologist
3. the time required for the tube to make a complete 360* revolution about the gantry
4. the length of time required for the production of photons to begin after applying the voltage to the tube

Reveal answer 18) CT is commonly referred to as all of the following names EXCEPT:

1. computerized axial tomography
2. digital subtraction angiography
3. CAT-scan
4. computed tomography

Reveal answer 19) A(n) _____________ artifact is a streak artifact which arises from a high spatial frequency interface between tissues with a great difference in density

1. tube arcing
2. edge gradient
3. cone beam
4. ring

Reveal answer 20) In order for an x-ray photon to be measured it must: 1. enter the detector chamber 2. be absorbed by the detector material 3. be converted to a measurable event.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 21) CT images can be directly scanned in planes other than transverse by: 1. orienting the patient's body part so that it is not perpendicular to the x-ray beam 2. tilting the gantry 3. changing the angle that the x-ray beam leaves the tube.

1. 1 only
2. 1 & 2
3. 2 & 3
4. 1, 2 & 3

Reveal answer 22) A(n) _____________ artifact is a streak artifact which arises from a high spatial frequency interface between tissues with a great difference in density

1. tube arcing
2. edge gradient
3. cone beam
4. ring

Reveal answer 23) Which of the following is TRUE regarding solid state detectors? 1. x-ray photons cause the detectors to generate a flash of light 2. they are the detector type used on most CT scanners today 3. they can be used in both third-generation and fourth-generation CT systems

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 24) Which of the following will have the least likelihood of producing edge gradient artifacts?

1. thin slices with full scan
2. thick slices with partial scan
3. thin slices with partial scan
4. thick slice with full scan

Reveal answer 25) Which of the following strategies will minimize metal artifacts? 1. remove as much metal from the patient as possible 2. orient slices such that the metal is avoided if possible 3. inspect the localizer for any metal on the patient and remove any metal or avoid imaging it as much as possible

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 26) On a third-generation single-row detector scanner, if there are 715 detectors and there are 900 projections in a full rotation, how many samples of attenuation data are collected for the raw data of a single slice if the scan calls for an overscan of 400° rotation?

1. 286,000
2. 643,000
3. 715,000
4. 845,000

Reveal answer 27) The actual attenuation data measured by the detectors from all projections during a scan is contained in CT _______________ data 1. image 2. convolved 3. raw

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 28) The enormous heat that builds up in the CT tube is caused by the:

1. intensity of the x-rays emitted from the tube
2. electron beam between the cathode and the anode in the tube
3. x-ray filter in the tube which absorbs the lower energy photons before they can enter the patient
4. collision of the electron beam with the tungsten target on the tube anode

Reveal answer 29) Which of the following is a component NOT normally located in the gantry of a modern CT system?

1. pre-patient collimators
2. solid-state detectors
3. array processor
4. x-ray tube

Reveal answer 30) Which of the following would eliminate a ring artifact?

1. recalibration of the detector elements
2. removal of metal
3. decreased matrix
4. increased mAs

Reveal answer 31) the mA determines the:

1. quantity of x-ray photons
2. coefficient of attenuation
3. slice thickness
4. energy level of the x-ray photons

Reveal answer 32) Scatter radiation is caused by:

1. miscalibrated detector
2. x-rays generated spontaneously in the ambient atmosphere
3. deflections from the original trajectory of an x-ray photons through the patient
4. improper patient positioning

Reveal answer 33) Multi-planar reconstructions are performed on which of the following? 1. image data 2. raw data 3. attenuation profiles

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 34) ______________ may have to be edited out from the data set to get a diagnostic MIP of a CTA exam.

1. Iodinated contrast media
2. Vessels of interest
3. Air
4. Bones

Reveal answer 35) In which direction are streaks from the edge gradient effect oriented?

1. radially outward from the center of the image
2. parallel to the direction of the sharp density difference interface
3. perpendicular to the direction of the sharp density difference interface
4. in a herringbone pattern across the image

Reveal answer 36) A(n) _____________ artifact is a streak artifact which arises from a high spatial frequency interface between tissues with a great difference in density

1. tube arcing
2. edge gradient
3. cone beam
4. ring

Reveal answer 37) Which of the following is TRUE regarding multi-row detector CT scanners?

1. 2. the attenuation information from adjacent detector arrays may be added together to generate thicker slices
2. 3. all of the detector arrays may or may not be used
3. 1 only
4. 1, 2 & 3

Reveal answer 38) Which of the following may occur during the interscan delay of a conventional, or serial, CT scan performed on a continuous rotation scanner? 1. the table position is incremented 2. the tube continues to rotate in the same direction as during the scan 3. the tube assembly makes a 360° rotation

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 39) Which of the following would eliminate a ring artifact?

1. recalibration of the detector elements
2. removal of metal
3. decreased matrix
4. increased mAs

Reveal answer 40) Which of the following window settings provides the best tissue differentiation within the liver?

1. WW 100, WL -200
2. WW 140, WL 60
3. WW 1000, WL 200
4. WW 2500, WL 350

Reveal answer 41) On a single-row detector scanner, collimation:

1. 2. minimizes the x-ray dose to the patient
2. 3. reduces the detection of scatter radiation
3. 1 only
4. 1, 2 & 3

Reveal answer 42) An increase in _________________ does NOT occur in the resulting images when applying a sharp, or high-pass reconstruction filter during the image reconstruction of CT raw data. 1. contrast resolution 2. edge enhancement 3. the appearance of noise

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 43) MDCT scanners capable of collecting 64 slices in a single rotation do NOT:

1. perform conventional CT scans
2. perform helical CT scans
3. use filtered back projection as their method of image reconstruction
4. perform localizer scans

Reveal answer 44) A variation in which of the following will affect the hardening of an x-ray beam? 1. tissue density 2. tissue thickness 3. kVp

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 45) For CT exams of the chest, the patient is usually positioned:

1. prone with arms at sides
2. prone with arms raised over the head
3. decubitus with arms raised over the head
4. supine with arms raised over the head

Reveal answer 46) ________________ yields an image that appears 3D but also shows anatomical details above and below the 3D surface

1. SSD
2. VR
3. MIP
4. Multi-planar reconstruction

Reveal answer 47) The CT x-ray tube rotates around the patient to: 1. keep the tube cool 2. generate projection views at different angles 3. minimize the x-ray dose administered to the patient

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 48) Which of the following FALSE regarding CT systems?

1. 2. they cannot generate a straight coronal or sagittal image
2. 3. they have no moving parts
3. 1 only
4. 1, 2 & 3

Reveal answer 49) ________________ yields an image that appears 3D but also shows anatomical details above and below the 3D surface.

1. SSD
2. VR
3. MIP
4. Multi-planar reconstruction

Reveal answer 50) For a CT scan of the spleen which of the following is typically used?

1. only IV contrast media
2. only oral contrast media
3. both oral and IV contrast media
4. no contrast media is used

Reveal answer 51) Which of the following may occur during the interscan delay of a conventional, or serial, CT scan performed on a continuous rotation scanner? 1. the table position is incremented 2. the tube continues to rotate in the same direction as during the scan 3. the tube assembly makes a 360° rotation

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 52) In a ___________________, the highest pixel values from a stack of CTA images are projected along many "rays".

1. SSD
2. MIP
3. PR
4. VR

Reveal answer 53) A smooth, or low-pass, reconstruction filter is typically NOT selected for a(n) ________________ exam

1. pituitary
2. kidneys
3. liver
4. internal auditory canals

Reveal answer 54) Which of the following does NOT affect the quantity of x-rays that completely penetrates the patient? 1. the distance that the x-ray photons must travel on their course through the patient's body. 2. the molecular composition of the tissues through which the x-ray photons pass. 3. the type of detector material used

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 55) A pixel is a:

1. bright artifact on a film
2. single 3D volume element within a volume of anatomical data
3. single 2D picture element within an image plane
4. range of gray levels on a CT image

Reveal answer 56) Which of the following would decrease the effects of beam hardening artifacts? 1. increased kVp 2. increased mAs 3. increased scan time

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 57) Scatter radiation is caused by:

1. miscalibrated detector
2. x-rays generated spontaneously in the ambient atmosphere
3. deflections from the original trajectory of an x-ray photons through the patient
4. improper patient positioning

Reveal answer 58) CTA images come from a ___________________ scan 1. conventional, or serial 2. helical 3. localizer

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 59) ______________ allows helical data to be converted into planar raw data.

1. Retrospective reconstruction
2. Interpolation
3. Cone beam reconstruction
4. Convolution

Reveal answer 60) Which of the following is TRUE regarding solid state detectors?

1. 2. they are the detector type used on most CT scanners today
2. 3. they can be used in both third-generation and fourth-generation CT systems
3. 1 only
4. 1, 2 & 3

Reveal answer 61) Increased _______________ will increase the likelihood that a given x-ray will penetrate a material. 1. kV 2. mA 3. exposure time

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 62) Which of the following would eliminate a ring artifact?

1. recalibration of the detector elements
2. removal of metal
3. decreased matrix
4. increased mAs

Reveal answer 63) Which of the following is the typical orientation for a localizer in a chest exam?

1. AP
2. transverse
3. lateral
4. oblique

Reveal answer 64) Which of the following may occur if the patient's arms are placed at their sides during a chest exam if the scan field-of view is 33cm? 1. beam hardening 2. out-of-field artifact 3. cone beam artifact

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 65) The number of electrons that flow from the cathode to the anode in the tube is controlled by the:

1. anode target
2. collimation
3. mA
4. kV

Reveal answer 66) ____________ in the image is a possible manifestation of patient motion. 1. ghosting 2. blurring 3. streaks

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 67) _________________ made helical imaging possible.

1. multi-row detector scanners
2. the introduction of second-generation technology
3. the introduction of fourth-generation technology
4. continuous rotation scanners

Reveal answer 68) Which of the following may be a result of partial volume averaging? 1. decreased sharpness of edges 2. inaccurate CT numbers 3. ghosting of tissue boundaries

1. 1 only
2. 2 only
3. 1 & 2
4. 3 only

Reveal answer 69) Which of the following may occur if the patient's arms are placed at their sides during a chest exam if the scan field-of view is 33cm? 1. beam hardening 2. out-of-field artifact 3. cone beam artifact

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 70) ________________ scanner design was the first to acquire four slices in a single rotation.

1. second - generation
2. third-generation
3. multi-row detector
4. continuous rotation

Reveal answer 71) Which type(s) of storage media may hold CT image data? 1. internal hard disk 2. CD 3. re-writable optical disk

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 72) What is the most common type of film used for recording CT images?

1. thermal
2. double emulsion
3. single emulsion
4. paper

Reveal answer 73) The patent table:

1. may move continuously during the scan
2. can never be positioned automatically by software due to safety precautions
3. remains stationary throughout the patient exam once it is initially positioned
4. only moves after each slice is completed

Reveal answer 74) Which system component converts the projection attenuation data into the proper digital form for the array processor?

1. detector
2. photodiode
3. analog-to-digital converter
4. host computer

Reveal answer 75) Tube arcing might cause ____________ on the images.

1. star-like artifacts at the edges
2. an increased appearance of noise
3. shading and inaccurate CT numbers
4. an appearance of a circle or ring

Reveal answer 76) For CT exams of the chest, the patient is usually positioned:

1. prone with arms at sides
2. prone with arms raised over the head
3. decubitus with arms raised over the head
4. supine with arms raised over the head

Reveal answer 77) A variation in which of the following will affect the hardening of an x-ray beam? 1. tissue density 2. tissue thickness 3. kVp

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 78) The service angineer should be notified about which of the following? 1. frequent bad streaks on the inferior slices of head scans 2. a consistent circle on the images 3. frequent bad streaks throughout the entire image

1. 1 only
2. 2 only
3. 3 only
4. 2 & 3

Reveal answer 79) Which of the following is a reason for inserting a tampon in the vagina for CT exams of the female pelvis?

1. provides a high intensity on the image
2. eliminates the need for IV contrast injection
3. eliminates the need for oral contrast media
4. helps visualize the vaginal canal

Reveal answer 80) From which of the following can the most diagnostic multi-planar reconstructions be generated? 1. stacked transverse images from a helical scan 2. stacked transverse images from a conventional, serial scan. 3. stacked localizer images

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 81) Which of the following strategies minimizes beam hardening artifact from dense contrast media? 1. the contrast solution can be diluted 2. the scan can be performed with a slight delay 3. the scan can be performed in the opposite direction

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 82) For which of the following studies in the chest is IV contrast typically used? 1. chest masses 2. hilar masses 3. cardiac masses

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 83) What control does the operator have over the x-rays in a CT exam?

1. the temperature and color of the x-rays can be tuned
2. the energy level and the quantity of x-rays can be selected
3. the volume and tone of the x-rays can be dialed
4. the phase and frequency of the x-rays can be adjusted

Reveal answer 84) CT x-ray tube arcing can occur because of ___________ the x-ray tube 1. impourities in the oil outside 2. tungsten gas inside 3. tungsten solids in the oil inside

1. 1 only
2. 1 & 2
3. 2 only
4. 2 & 3

Reveal answer 85) In which direction are streaks from the edge gradient effect oriented?

1. radially outward from the center of the image
2. parallel to the direction of the sharp density difference interface
3. perpendicular to the direction of the sharp density difference interface
4. in a herringbone pattern across the image

Reveal answer 86) CTA images come from a ___________________ scan. 1. conventional, or serial 2. helical 3. localizer

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 87) What is the primary reason to have a patient phonate the letter "e" during a CT exam of the larynx?

1. it closes the pyriform sinuses
2. it demonstrates vocal cord mobility
3. it distends the laryngeal ventricles
4. it provides definition of the epiglottis

Reveal answer 88) Increased _______________ will increase the likelihood that a given x-ray will penetrate a material

1. 1. kV
2. 2. mA
3. 3. exposure time
4. 1 only

Reveal answer 89) What does convolution do to the image quality when it is added to the back projection reconstruction process?

1. normalizes the attenuation coefficients to ensure tissues are displayed with correct CT numbers
2. increases the number of projections thereby reducing streaking artifacts
3. improves contrast resolution by reducing scatter radiation
4. enhances important characteristics of attenuation profiles thus reducing streak and star artifacts.

Reveal answer 90) The result of the bifurcation of the abdominal aorta is the left and right ___________ arteries.

1. femoral
2. common iliac
3. popliteal
4. quadriceps

Reveal answer 91) Which of the following are NOT commonly used on today's commercially available CT scanners?

1. 1. xenon detectors
2. 2. fourth-generation technology
3. 3. continuous rotation technology
4. 1 only

Reveal answer 92) Which of the following could allow for a reduction of partial volume artifact while not increasing the appearance of noise in the image?

1. increasing slice thickness while decreasing kVp
2. decreasing slice thickness while decreasing mAs
3. increasing slice thickness while increasing mAs
4. decreasing slice thickness while increasing mAs

Reveal answer 93) Which of the following may be a result of partial volume averaging? 1. decreased sharpness of edges 2. inaccurate CT numbers 3. ghosting of tissue boundaries

1. 1 only
2. 2 only
3. 1 & 2
4. 3 only

Reveal answer 94) Which of the following statements is FALSE regarding occurences after an x-ray photon penetrates the detector aperture? 1. the photon can pass through the detector unmeasured. 2. the photon is converted completely into an electron 3. the measured signal is enhanced by an amplifier

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 95) On a CT image of the brain a cupping artifact would appear brighter:

1. at the anterior and posterior aspects of the brain
2. at the periphery of the brain
3. immediately around dense structures
4. in the center of the brain

Reveal answer 96) CT x-ray tube arcing can occur because of ___________ the x-ray tube 1. impourities in the oil outside 2. tungsten gas inside 3. tungsten solids in the oil inside

1. 1 only
2. 1 & 2
3. 2 only
4. 2 & 3

Reveal answer 97) Which of the following is a technique used to minimize artifacts from patient motion in exams of the chest? 1. suspended respiration 2. shortened scan time 3. patient immobilization devices

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 98) Typically, what mAs is used in routine CT exams of the abdomen?

1. 100 to 200
2. 200 to 300
3. 300 to 400
4. 400 to 500

Reveal answer 99) The enormous heat that builds up in the CT tube is caused by the:

1. intensity of the x-rays emitted from the tube
2. electron beam between the cathode and the anode in the tube
3. x-ray filter in the tube which absorbs the lower energy photons before they can enter the patient
4. collision of the electron beam with the tungsten target on the tube anode

Reveal answer 100) MIP images:

1. are most frequently used for visualizing air-filled spaces
2. can NOT be run in a cine loop
3. are most accurate when a large volume of interest is selected
4. do NOT demonstrate detail beneath the brightest pixel

Reveal answer 101) Which of the following are NOT commonly used on today's commercially available CT scanners? 1. xenon detectors 2. fourth-generation technology 3. continuous rotation technology

1. 1 only
2. 1 & 2
3. 2 & 3
4. 1, 2, & 3

Reveal answer 102) X-ray photons are produced by a fast-moving electron:

1. 2. passing close to an atomic nucleus
2. 3. colliding with an electron within an atom and ejecting it
3. 1 only
4. 1, 2 & 3

Reveal answer 103) Which of the following could allow for a reduction of partial volume artifact while not increasing the appearance of noise in the image?

1. increasing slice thickness while decreasing kVp
2. decreasing slice thickness while decreasing mAs
3. increasing slice thickness while increasing mAs
4. decreasing slice thickness while increasing mAs

Reveal answer 104) In a ___________________, the highest pixel values from a stack of CTA images are projected along many "rays"

1. SSD
2. MIP
3. PR
4. VR

Reveal answer 105) Which of the following is NOT a function of the PACS system?

1. reconstruction of the image from the raw data
2. long term data storage
3. digital distribution of images
4. image display for the radiologists

Reveal answer 106) For a CT scan of the spleen which of the following is typically used?

1. only IV contrast media
2. only oral contrast media
3. both oral and IV contrast media
4. no contrast media is used

Reveal answer 107) The number of electrons that flow from the cathode to the anode in the tube is controlled by the:

1. anode target
2. collimation
3. mA
4. kV

Reveal answer 108) Which of the following statements is FALSE regarding 3D SSD?

1. helical image data is well suited for 3D SSD because there is minimal misregistration or gaps
2. the volume data, from which 3D SSD is generated, is created by combining transverse, sagittal, and coronal reconstructions
3. the tissue surface may be selected by using a threshold value equal to the tissue's CT number
4. patient motion during the scan is detrimental to the quality of the 3D images

Reveal answer 109) MDCT scanners capable of collecting 64 slices in a single rotation do NOT:

1. perform conventional CT scans
2. perform helical CT scans
3. use filtered back projection as their method of image reconstruction
4. perform localizer scans

Reveal answer 110) The x-ray beam used in CT scanning is __________________ the patient's tissues. 1. reflected off of 2. attenuated by 3. generated by

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 111) A variation in which of the following will affect the hardening of an x-ray beam? 1. tissue density 2. tissue thickness 3. kVp

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 112) Which of the following is typical scan delay after the initiation of injection of contrast media for studies of the liver?

1. 15 to 25 seconds
2. 65 to 75 seconds
3. 85 to 95 seconds
4. a few minutes

Reveal answer 113) The result of the bifurcation of the abdominal aorta is the left and right ___________ arteries.

1. femoral
2. common iliac
3. popliteal
4. quadriceps

Reveal answer 114) Collimation:

1. is accomplished by electrically blocking x-rays
2. affects the scan time
3. limits the low energy x-ray photons and passes the high energy photons
4. is accomplished by physically blocking x-rays.

Reveal answer 115) Which of the following window settings provides the best tissue differentiation of the soft tissues of the supratentorium?

1. window width = 1000, window level = 200
2. window width = 300, window level = 60
3. window width = 2500, window level = 350
4. window width = 100, window level = 30

Reveal answer 116) How would the artifact from a faulty detector element appear on a localizer image?

1. a line perpendicular to the long axis of the patient table
2. it depends on the orientation in which the localizer image is performed
3. a circle in the center of the image
4. a line parallel to the long axis of the patient table

Reveal answer 117) the mA determines the:

1. quantity of x-ray photons
2. coefficient of attenuation
3. slice thickness
4. energy level of the x-ray photons

Reveal answer 118) Which of the following is TRUE as the slice thickness is decreased?

1. partial volume artifacts increase while edge gradient artifacts decrease
2. partial volume artifacts and edge gradient artifacts decrease
3. partial volume artifacts decrease while edge gradient artifacts increase
4. partial volume artifacts and ege gradient artifacts increase

Reveal answer 119) Which of the following strategies would NOT help us differentiate possible pathology from a partial volume artifact? 1. inspection of adjacent slices 2. collect additional thinner slices through suspicious region 3. rescan and decrease pitch (without changing slice thickness)

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 120) Which of the following structures is NOT part of the GI tract?

1. esophagus
2. stomach
3. duodenum
4. spleen

Reveal answer 121) Which of the following is typical scan delay after the initiation of injection of contrast media for studies of the liver?

1. 15 to 25 seconds
2. 65 to 75 seconds
3. 85 to 95 seconds
4. a few minutes

Reveal answer 122) The slip ring on continuous rotation CT scanners: 1. prevents the high voltage cable from winding up 2. allows the exam to commence more rapidly 3. eliminates the need for the reversal of gantry frame rotation.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2, & 3

Reveal answer 123) Which of the following is NOT a function of the PACS system?

1. reconstruction of the image from the raw data
2. long term data storage
3. digital distribution of images
4. image display for the radiologists

Reveal answer 124) Which of the following strategies will minimize metal artifacts? 1. remove as much metal from the patient as possible 2. orient slices such that the metal is avoided if possible 3. inspect the localizer for any metal on the patient and remove any metal or avoid imaging it as much as possible

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 125) On a CT image of the brain a cupping artifact would appear brighter:

1. at the anterior and posterior aspects of the brain
2. at the periphery of the brain
3. immediately around dense structures
4. in the center of the brain

Reveal answer 126) In which technique are tissues other than the surface of a structure excluded by setting a threshold value and eliminating pixels above or below that threshold?

1. volume rendering
2. multi-planar reconstruction
3. maximum intensity projection
4. 3D shaded Surface Display

Reveal answer 127) Which of the following window settings provides the best tissue differentiation within the liver?

1. WW 100, WL -200
2. WW 140, WL 60
3. WW 1000, WL 200
4. WW 2500, WL 350

Reveal answer 128) A helical scan performed on a 64 slice MDCT scanner is reconstructed with:

1. back projection
2. simple reconstruction because it is a single projection scan
3. no reconstruction filter
4. cone beam reconstruction

Reveal answer 129) The x-ray beam used in CT scanning is __________________ the patient's tissues 1. reflected off of 2. attenuated by 3. generated by

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 130) What control does the operator have over the x-rays in a CT exam?

1. the temperature and color of the x-rays can be tuned
2. the energy level and the quantity of x-rays can be selected
3. the volume and tone of the x-rays can be dialed
4. the phase and frequency of the x-rays can be adjusted.

Reveal answer 131) Which of the following would decrease the effects of beam hardening artifacts? 1. increased kVp 2. increased mAs 3. increased scan time

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 132) ______________________ is the mathematical process used by single-row detector scanners to reconstruct CT images from raw data.

1. Weighted averaging
2. Filtered back projection
3. the Fourier transform
4. Integration of the area under the curve

Reveal answer 133) A CT system manufacturer has a scanner in which the focal spot of the x-ray beam can move to two, slightly separated, distinct locations. What benefit does the dual focal spot provide compared to an identical scanner possessing a single focal spot? 1. the number of projections is doubled 2. the number of rays in a single projection is doubled 3. the patient dose is halved

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 134) Which of the following statements is TRUE concerning the lobes of the liver? 1. the left lobe is more anterior than the right lobe 2. the left lobe is more anterior than the caudate lobe 3. the caudate lobe is more medial than the right lobe

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 135) Which of the following statements is FALSE regarding occurences after an x-ray photon penetrates the detector aperture?

1. 2. the photon is converted completely into an electron
2. 3. the measured signal is enhanced by an amplifier
3. 1 only
4. 2 only

Reveal answer 136) The ________________ move(s) during a helical scan on a third-generation scanner. 1. x-ray tube 2. patient table 3. detector elements

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 137) Which of the following is a reconstruction technique applied to the raw data after the primary reconstruction has already been accomplished?

1. maximum intensity projection
2. volume rendering
3. retrospective reconstruction
4. multi-planar reconstruction

Reveal answer 138) Multi-planar reconstructions are performed on which of the following? 1. image data 2. raw data 3. attenuation profiles

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 139) Which of the following is TRUE as the slice thickness is decreased?

1. partial volume artifacts increase while edge gradient artifacts decrease
2. partial volume artifacts and edge gradient artifacts decrease
3. partial volume artifacts decrease while edge gradient artifacts increase
4. partial volume artifacts and ege gradient artifacts increase

Reveal answer 140) Which of the following will have the least likelihood of producing edge gradient artifacts?

1. thin slices with full scan
2. thick slices with partial scan
3. thin slices with partial scan
4. thick slice with full scan

Reveal answer 141) For a routine CT exam of the pelvis, what gantry tilt is used?

1. 20°
2. -20°
3. 10°
4. no tilt is used

Reveal answer 142) Which of the following provides the best bone window setting for the pelvis?

1. WW 2000, WL 350
2. WW 140, WL 60
3. WW 100, WL -200
4. WW 1000, WL 200

Reveal answer 143) X-rays are used in CT because:

1. they are easily produced by the high frequency generator
2. they are less harmful than the heating effects of microwave radiation
3. they penetrate the body according to specific attenuation characteristics of each tissue
4. the FDA imposes no limit on the dose to the patient.

Reveal answer 144) Which of the following strategies will minimize metal artifacts? 1. remove as much metal from the patient as possible 2. orient slices such that the metal is avoided if possible 3. inspect the localizer for any metal on the patient and remove any metal or avoid imaging it as much as possible

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 145) Most of the commands from the technologist are received by the:

1. array processor
2. operator's console
3. host computer
4. amplifier

Reveal answer 146) In order for an x-ray photon to be measured it must:

1. 2. be absorbed by the detector material
2. 3. be converted to a measurable event
3. 1 only
4. 1, 2 & 3

Reveal answer 147) A helical scan performed on a 64 slice MDCT scanner is reconstructed with:

1. back projection
2. simple reconstruction because it is a single projection scan
3. no reconstruction filter
4. cone beam reconstruction

Reveal answer 148) Which of the following is TRUE regarding the slice thickness of an image reconstructed from a helical scan? 1. on a multi-row detector scanner, the thickness is equal to the beam collimation 2. on a single-row detector scanner, the thickness is equal to the beam collimation 3. on a single-row detector scanner, the thickness can be varied retrospectively

1. 1 only
2. 2 only
3. 2 & 3
4. 1, 2 & 3

Reveal answer 149) Which of the following may be a result of partial volume averaging? 1. decreased sharpness of edges 2. inaccurate CT numbers 3. ghosting of tissue boundaries

1. 1 only
2. 2 only
3. 1 & 2
4. 3 only

Reveal answer 150) Which of the following is a technique used to minimize artifacts from patient motion in exams of the chest? 1. suspended respiration 2. shortened scan time 3. patient immobilization devices

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 151) Which of the following is NOT contained within the mediastinum?

1. esophagus
2. heart
3. bronchi
4. lungs

Reveal answer 152) Tube arcing might cause ____________ on the images

1. star-like artifacts at the edges
2. an increased appearance of noise
3. shading and inaccurate CT numbers
4. an appearance of a circle or ring

Reveal answer 153) Which of the following statements is TRUE? 1. kV is the voltage potential between the tube cathode and anode while mA ultimately controls the filament current and, thus, the temperature of the cathode filament 2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray photons emitted from the tube. 3. although the kV and the mA affect the operation of the CT x-ray tube, the two parameters have no bearing on the image quality.

1. 1 only
2. 2 only
3. 1 & 2
4. 2 & 3

Reveal answer 154) X-rays are produced whenever fast-moving electrons collide with any form of matter because: 1.the electron splits into two x-ray photons of equal energy upon impact with the matter. 2. the electron loses kinetic energy which is converted into the emission of an x-ray photon 3. the electron converts the electron it collides with into an x-ray photon

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 155) For which of the following studies in the chest is IV contrast typically used? 1. chest masses 2. hilar masses 3. cardiac masses

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 156) The CT x-ray tube rotates around the patient to:

1. 2. generate projection views at different angles
2. 3. minimize the x-ray dose administered to the patient
3. 1 only
4. 2 only

Reveal answer 157) How would the artifact from a faulty detector element appear on a localizer image?

1. a line perpendicular to the long axis of the patient table
2. it depends on the orientation in which the localizer image is performed
3. a circle in the center of the image
4. a line parallel to the long axis of the patient table

Reveal answer 158) Using a __________________ reconstruction filter would decrease the appearance of noise in a CT image. 1. no 2. a sharp 3. a smooth

1. 1 only
2. 2 only
3. 2 & 3
4. 3 only

Reveal answer 159) If an algorithm to correct for the cupping artifact is applied too aggressively to the data for a head image, the _____________ of the image would be too bright 1. top and bottom 2. center 3. edges

1. 1 only
2. 2 only
3. 3 only
4. 1 & 3

Reveal answer 160) Which of the following are typical start and end locations for CT scans of the pelvis?

1. from the xyphoid process through the iliac crest
2. from the sternal notch through the iliac crest
3. from the iliac crest through the symphysis pubis
4. from the sternal notch through the symphysis pubis

Reveal answer 161) Which of the following is the typical orientation for a localizer in a chest exam?

1. AP
2. transverse
3. lateral
4. oblique

Reveal answer 162) Most of the commands from the technologist are received by the:

1. array processor
2. operator's console
3. host computer
4. amplifier

Reveal answer 163) The patent table:

1. may move continuously during the scan
2. can never be positioned automatically by software due to safety precautions
3. remains stationary throughout the patient exam once it is initially positioned
4. only moves after each slice is completed.

Reveal answer 164) Which of the following strategies would NOT help us differentiate possible pathology from a partial volume artifact? 1. inspection of adjacent slices 2. collect additional thinner slices through suspicious region 3. rescan and decrease pitch (without changing slice thickness)

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 165) A __________________ scan uses only a single projection. 1. conventional, or serial 2. helical 3. localizer

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 166) Typically, what mAs is used in routine CT exams of the abdomen?

1. 100 to 200
2. 200 to 300
3. 300 to 400
4. 400 to 500

Reveal answer 167) On a CTA exam of lower extremity vasculature to assess atherosclerosis, coverage should extend from the ______________ to the _______________

1. abdominal aorta, ankles
2. abdominal aorta, iliac arteries
3. iliac arteries, femoral arteries
4. iliac arteries, popliteal arteries

Reveal answer 168) Which of the following statements is TRUE?

1. 2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray photons emitted from the tube
2. 3. although the kV and the mA affect the operation of the CT x-ray tube, the two parameters have no bearing on the image quality
3. 1 only
4. 1 & 2

Reveal answer 169) Which of the following statements is FALSE regarding the collection of CT data?

1. long scan times are more desirable because they average out motion artifacts
2. the reconstruction process used to create the image occurs in the array processor
3. to collect the complete set of CT data, x-rays must be passed through the body at many different angles
4. the detectors measure x-rays which completely penetrate the patient.

Reveal answer 170) Which of the following strategies minimizes beam hardening artifact from dense contrast media? 1. the contrast solution can be diluted 2. the scan can be performed with a slight delay 3. the scan can be performed in the opposite direction

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 171) X-rays are produced whenever fast-moving electrons collide with any form of matter because:

1. 2. the electron loses kinetic energy which is converted into the emission of an x-ray photon
2. 3. the electron converts the electron it collides with into an x-ray photon
3. 1 only
4. 2 only

Reveal answer 172) Tube interscan delay time refers to:

1. the time between the end of one scan and the state of the next scan during which the tube will cool
2. a quality assurance test performed daily by the technologist
3. the time required for the tube to make a complete 360* revolution about the gantry
4. the length of time required for the production of photons to begin after applying the voltage to the tube.

Reveal answer 173) Which of the following statements is TRUE? 1. the amplified electrical signal obtained from the detectors must be digitized 2. digital CT images are numerical representations of cross-sectional anatomy 3. digital signals may be formed by sampling analog signals at discrete time intervals

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 174) MIP images:

1. are most frequently used for visualizing air-filled spaces
2. can NOT be run in a cine loop
3. are most accurate when a large volume of interest is selected
4. do NOT demonstrate detail beneath the brightest pixel

Reveal answer 175) How would the artifact from a faulty detector element appear on a localizer image?

1. a line perpendicular to the long axis of the patient table
2. it depends on the orientation in which the localizer image is performed
3. a circle in the center of the image
4. a line parallel to the long axis of the patient table

Reveal answer 176) The ________________ move(s) during a helical scan on a third-generation scanner 1. x-ray tube 2. patient table 3. detector elements

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 177) CT is commonly referred to as all of the following names EXCEPT:

1. computerized axial tomography
2. digital subtraction angiography
3. CAT-scan
4. computed tomography

Reveal answer 178) Bremsstrahlung radiation does NOT include which type of electron activity?

1. 2. collision between an incoming electron and an electron in an inner shell of the target atom
2. 3. slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom
3. 1 only
4. 2 only

Reveal answer 179) The cathode filament:

1. helps determine the size of the focal spot
2. lights up the tube so it can be serviced by an engineer
3. releases the x-ray photons
4. focuses x-rays onto the anode target

Reveal answer 180) Which of the following FALSE regarding CT systems? 1.they are limited to non-oblique transverse scanning 2. they cannot generate a straight coronal or sagittal image. 3. they have no moving parts

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 181) Which of the following could allow for a reduction of partial volume artifact while not increasing the appearance of noise in the image?

1. increasing slice thickness while decreasing kVp
2. decreasing slice thickness while decreasing mAs
3. increasing slice thickness while increasing mAs
4. decreasing slice thickness while increasing mAs

Reveal answer 182) Which of the following strategies minimizes beam hardening artifact from dense contrast media? 1. the contrast solution can be diluted 2. the scan can be performed with a slight delay 3. the scan can be performed in the opposite direction

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 183) Which of the following is a reconstruction technique applied to the raw data after the primary reconstruction has already been accomplished?

1. maximum intensity projection
2. volume rendering
3. retrospective reconstruction
4. multi-planar reconstruction

Reveal answer 184) Which of the following may occur if the patient's arms are placed at their sides during a chest exam if the scan field-of view is 33cm? 1. beam hardening 2. out-of-field artifact 3. cone beam artifact

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 185) ____________ in the image is a possible manifestation of patient motion 1. ghosting 2. blurring 3. streaks

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 186) Which of the following CT scanner designs does NOT use an x-ray tube?

1. first-generation CT
2. PET/CT
3. electron beam CT
4. MDCT

Reveal answer 187) The operator's console may include:

1. 2. keyboard
2. 3. graphic input device
3. 1 only
4. 1, 2 & 3

Reveal answer 188) Which of the following statements is FALSE regarding the collection of CT data?

1. long scan times are more desirable because they average out motion artifacts
2. the reconstruction process used to create the image occurs in the array processor
3. to collect the complete set of CT data, x-rays must be passed through the body at many different angles
4. the detectors measure x-rays which completely penetrate the patient

Reveal answer 189) Which technology do multi-row detector scanners employ?

1. second-generation
2. third-generation
3. fourth-generation
4. first-generation

Reveal answer 190) A retrospective reconstruction, in which the reconstruction field-of-view is varied, uses:

1. a reconstructed image in the sagittal plane
2. CT raw data
3. more photons
4. CT image data

Reveal answer 191) A kernel is a:

1. component in the c-ray tube
2. post-processing filter applied to image data
3. type of detector
4. filter applied to the CT raw data

Reveal answer 192) ________________ scanner design was the first to acquire four slices in a single rotation

1. second - generation
2. third-generation
3. multi-row detector
4. continuous rotation

Reveal answer 193) Which of the following does NOT affect the quantity of x-rays that completely penetrates the patient?

1. 2. the molecular composition of the tissues through which the x-ray photons pass
2. 3. the type of detector material used
3. 1 only
4. 3 only

Reveal answer 194) 3D shaded surface displays are performed on CT: 1.image data 2. raw data 3. attenuation profiles

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 195) Which of the following structures is NOT part of the GI tract?

1. esophagus
2. stomach
3. duodenum
4. spleen

Reveal answer 196) _________________ made helical imaging possible

1. multi-row detector scanners
2. the introduction of second-generation technology
3. the introduction of fourth-generation technology
4. continuous rotation scanners

Reveal answer 197) Which of the following CT scanner designs does NOT use an x-ray tube?

1. first-generation CT
2. PET/CT
3. electron beam CT
4. MDCT

Reveal answer 198) Which of the following is NOT a part of the CT tube?

1. tungsten target
2. collimator
3. rotating anode
4. filament

Reveal answer 199) A CT system manufacturer has a scanner in which the focal spot of the x-ray beam can move to two, slightly separated, distinct locations. What benefit does the dual focal spot provide compared to an identical scanner possessing a single focal spot? 1. the number of projections is doubled 2. the number of rays in a single projection is doubled 3. the patient dose is halved

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 200) Which of the following utilizes convolution? 1. 3D SSD 2. Fourier transform 3. filtered back projection

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 201) Bremsstrahlung radiation does NOT include which type of electron activity? 1. collision between an incoming electron and the nucleus of the target atom. 2. collision between an incoming electron and an electron in an inner shell of the target atom. 3. slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 202) Which of the following strategies would NOT help us differentiate possible pathology from a partial volume artifact? 1. inspection of adjacent slices 2. collect additional thinner slices through suspicious region 3. rescan and decrease pitch (without changing slice thickness)

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 203) In which direction are streaks from the edge gradient effect oriented?

1. radially outward from the center of the image
2. parallel to the direction of the sharp density difference interface
3. perpendicular to the direction of the sharp density difference interface
4. in a herringbone pattern across the image

Reveal answer 204) The main purpose of the detector is to:

1. provide additional collimation in order to reduce scatter
2. limit the x-ray dose to the patient
3. capture x-ray photons and convert them to a measurable signal
4. amplify the measured signal

Reveal answer 205) Which system component converts the projection attenuation data into the proper digital form for the array processor?

1. detector
2. photodiode
3. analog-to-digital converter
4. host computer

Reveal answer 206) Which of the following is NOT an advantage of a helical study compared to a conventional, serial CT study?

1. minimal anatomical misregistration sometimes caused by inconsistent breath-holding
2. shorter total exam time
3. can retrospectively reconstruct a slice at any arbitrary position
4. offers the best image quality for a brain exam

Reveal answer 207) Which technology do multi-row detector scanners employ?

1. second-generation
2. third-generation
3. fourth-generation
4. first-generation

Reveal answer 208) Which of the following is TRUE as the slice thickness is decreased?

1. partial volume artifacts increase while edge gradient artifacts decrease
2. partial volume artifacts and edge gradient artifacts decrease
3. partial volume artifacts decrease while edge gradient artifacts increase
4. partial volume artifacts and ege gradient artifacts increase

Reveal answer 209) The ___________________ determines the intensity of the laser beam in a laser camera 1. intensifying grid 2. pixel values in the image data 3. magnifying power of the lens

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 210) The cathode filament:

1. helps determine the size of the focal spot
2. lights up the tube so it can be serviced by an engineer
3. releases the x-ray photons
4. focuses x-rays onto the anode target

Reveal answer 211) What does convolution do to the image quality when it is added to the back projection reconstruction process?

1. normalizes the attenuation coefficients to ensure tissues are displayed with correct CT numbers
2. increases the number of projections thereby reducing streaking artifacts
3. improves contrast resolution by reducing scatter radiation
4. enhances important characteristics of attenuation profiles thus reducing streak and star artifacts

Reveal answer 212) What is the most common type of film used for recording CT images?

1. thermal
2. double emulsion
3. single emulsion
4. paper

Reveal answer 213) CT images can be directly scanned in planes other than transverse by:

1. 2. tilting the gantry
2. 3. changing the angle that the x-ray beam leaves the tube
3. 1 only
4. 1 & 2

Reveal answer 214) Which of the following is NOT contained within the mediastinum?

1. esophagus
2. heart
3. bronchi
4. lungs

Reveal answer 215) For a routine CT exam of the pelvis, what gantry tilt is used?

1. 20°
2. -20°
3. 10°
4. no tilt is used

Reveal answer 216) The pencil thin section of the x-ray fan beam that strikes a single detector is called a:

1. line
2. projection
3. view
4. ray

Reveal answer 217) Which of the following is NOT a part of the CT tube?

1. tungsten target
2. collimator
3. rotating anode
4. filament

Reveal answer 218) The service angineer should be notified about which of the following? 1. frequent bad streaks on the inferior slices of head scans 2. a consistent circle on the images 3. frequent bad streaks throughout the entire image

1. 1 only
2. 2 only
3. 3 only
4. 2 & 3

Reveal answer 219) On a CT image of the brain a cupping artifact would appear brighter:

1. at the anterior and posterior aspects of the brain
2. at the periphery of the brain
3. immediately around dense structures
4. in the center of the brain

Reveal answer 220) The service angineer should be notified about which of the following? 1. frequent bad streaks on the inferior slices of head scans 2. a consistent circle on the images 3. frequent bad streaks throughout the entire image

1. 1 only
2. 2 only
3. 3 only
4. 2 & 3

Reveal answer 221) Which of the following will have the least likelihood of producing edge gradient artifacts?

1. thin slices with full scan
2. thick slices with partial scan
3. thin slices with partial scan
4. thick slice with full scan

Reveal answer 222) X-ray photons are produced by a fast-moving electron: 1. colliding with an atomic nucleus 2. passing close to an atomic nucleus 3. colliding with an electron within an atom and ejecting it.

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 223) The operator's console may include: 1. monitor 2. keyboard 3. graphic input device

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 224) A smooth, or low-pass, reconstruction filter is typically NOT selected for a(n) ________________ exam.

1. pituitary
2. kidneys
3. liver
4. internal auditory canals

Reveal answer 225) If an image matrix has 360 rows and 360 columns, how many pixels are there in the image?

1. 21,600
2. 129,600
3. 259,200
4. 379,800

Reveal answer 226) On a third-generation single-row detector scanner, if there are 715 detectors and there are 900 projections in a full rotation, how many samples of attenuation data are collected for the raw data of a single slice if the scan calls for an overscan of 400° rotation?

1. 286,000
2. 643,000
3. 715,000
4. 845,000

Reveal answer 227) Which of the following are typical start and end locations for CT scans of the pelvis?

1. from the xyphoid process through the iliac crest
2. from the sternal notch through the iliac crest
3. from the iliac crest through the symphysis pubis
4. from the sternal notch through the symphysis pubis

Reveal answer 228) Which of the following combinations of scanning parameters is best for evaluating abnormalities within the petrous pyramids of the temporal bones?

1. sharp algorithm, window width = 2500, 0.5 to 3mm slices
2. standard algorithm, window width = 2500, 4 to 8mm slices
3. standard algorithm, window width = 300, 0.5 to 3mm slices
4. soft algorithm, window width = 300, 0.5 to 3mm slices

Reveal answer 229) Which of the following would decrease the effects of beam hardening artifacts? 1. increased kVp 2. increased mAs 3. increased scan time

1. 1 only
2. 1 & 2
3. 2 only
4. 3 only

Reveal answer 230) Which of the following is a component NOT normally located in the gantry of a modern CT system?

1. pre-patient collimators
2. solid-state detectors
3. array processor
4. x-ray tube

Reveal answer 231) The ___________________ determines the intensity of the laser beam in a laser camera. 1. intensifying grid 2. pixel values in the image data 3. magnifying power of the lens

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer 232) Which of the following statements is TRUE concerning the lobes of the liver? 1. the left lobe is more anterior than the right lobe 2. the left lobe is more anterior than the caudate lobe 3. the caudate lobe is more medial than the right lobe

1. 1 only
2. 2 only
3. 3 only
4. 1, 2 & 3

Reveal answer

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