CT Review Essentials


Which of the following scientists were instrumental in the initial development of CT.
1. Alan Cormack
2. Raymond Damadian
3. Geodfrey Hounsfield
4. Paul Lauterbur

A. Only 2 and 4 are correct
B. Only 1, 2, and 3 are correct
C. All are correct
D. Only 4 is correct
E. Only 1 and 3 are correct


E. Only 1 and 3 are correct


Computed tomograpy (CT) results in a/an
A. curvilinear image
B. linear image
C. analog image
D. image in time
E. digital image


E. digital image


The principal advantage of CT over projection radiography is
A. speed of image acquisition
B. spatial resolution
C. temporal resolution
D. energy resolution
E. contrast resolution


E. contrast resolution


Which of the following terms does not fit?
A. axial
B. slice
C. volume
D. tomos
E. section


C. volume


Computed tomography is otherwise identified as
A. volumetric tomography
B. temporal tomography
C. emission tomography
D. transmission tomography
E. reflection tomography


D. transmission tomography


When compared to projection radiography, conventional tomography shows
A. improved contrast resolution
B. better spatial resolution
C. relaxed quality control
D. reduced patient dose
E. less operator involvement


A. improved contrast resolution


Which of the following involves emission of a signal from a patient?
A. projection radiography
B. magnetic resonance imaging
C. diagnostic ultrasound
D. spiral CT
E. CT


B. magnetic resonance imaging


The data acquisition in CT results in a/an
A. transverse image
B. oblique image
C. sagittal image
D. volume image
E. coronal image


A. transverse image


Which of the following scientists received the Nobel Prize for their work leading to CT?
1. Alan Cormack
2. Raymond Damadian
3. Geodfrey Hounsfield
4. Paul Lauterbur

A. Only 2 and 4 are correct
B. All are correct
C. Only 4 is correct
D. Only 1 and 3 are correct
E. Only 1, 2, and 3 are correct


D. Only 1 and 3 are correct


Which of the following are characteristic limitation of CT?
1. spatial resolution
2. artifact generation
3. z-axis resolution
4. patient dose

A. Only 1, 2, and 3 are correct
B. All are correct
C. Only 2 and 4 are correct
D. Only 4 is correct
E. Only 1 and 3 are correct


B. all are correct


A characteristic feature of a projection radiograph is
A. lengthy data acquisition
B. poor spatial resolution
C. tissue superimposition
D. excessive patient dose
E. difficult quality control requirements


C. tissue superimposition


which of the following finds application in bone mineral assay for evaluation of osteoporosis?
A. CT
B. conventional tomography
C. projection radiography
D. radioisotope emission tomography
E. fluoroscopy


A. CT


Which of the following involves emission of a signal from a patient?
A. diagnostic ultrasound
B. projection radiography
C. spiral CT
D. radioisotope imaging
E. CT


D. radioisotope imaging


Compared to projection radiography, conventional tomography results in improved contrast resolution because
A. the x-ray beam is selectively filtered
B. precise beam collimation is employed
C. out of plane tissue are blurred
D. imaging time is reduced
E. tissues are superimposed


C. out of plane tissue are blurred


Computed tomography results in improved contrast resolution because
A. KVp is significantly increased
B. digital techniques are employed
C. tissues are superimposed
D. precise beam collimation is employed
E. tissue superimposition is reduced


D. precise beam collimation is employed


The mathematics of back projection applied to image reconstruction in CT is credited to
A. Alan Cormack
B. Perry Sprawls
C. Frank Lauterbur
D. Raymond Damadian
E. Geodfrey Houndsfield


A. Alan Cormack


Place the following in chronological order.
1. CT
2. electron beam CT (EBCT)
3. multisection computed tomography
4. spiral CT

A. 1, 3, 4, 2
B. 1, 4, 2, 3
C. 1, 2, 4, 3
D. 1, 3, 2, 4
E. 1, 2, 3, 4


C. 1, 2, 4, 3


The term "projection," when applied to CT, refers to
A. the size of the x-ray beam projected on the patient
B. the mathematics of image reconstruction
C. the shape of the x-ray beam projected on the patient
D. speed of image acquisition
E. a data set representing x-ray attenuation in the patient


E. a data set representing x-ray attenuation in the patient


Compared to projection radiography, conventional tomography will improve
1. contrast resolution
2. patient dose
3. superimposition of tissues
4. spatial resolution


b. patient dose


Which of the following image modalities are likely to have less scatter radiation affecting the image?
A. projection of radiography
B. fluoroscopy
C. radioisotope emission tomography
D. conventional tomography
E. CT


E. CT


What is the principal cause of reduced contrast in projection radiography?
A. leakage radiation
B. scatter radiation
C. useful beam radiation
D. kVp
E. collimation


B. scatter radiation


The first CT image was demonstrated by
A. Frank Lauterbur
B. Raymond Damadian
C. Alan Cormack
D. Larry Rothenberg
E. Geodfrey Hounsfield


E. Geodfrey Hounsfield


The Principal advantage of CT over conventional tomography is
A. speed of image acquisition
B. improved contrast resolution
C. improved spatial resolution
D. reduced patient dose
c. fewer artifacts


B. improved contrast resolution


Which of the following imaging modalities appeared first?
A. emission imaging with radioisotopes
B. spiral CT
C. projection radiography
D. electron beam CT (EBCT)
E. diagnostic ultrasound


C. projection radiography


Image presentation in conventional tomography is
A. coronal
B. sagittal
C. volumetric
D. axial
E. transverse


D. axial


When compared to projection radiography, conventional tomography shows
A. better spatial resolution
B. less operator involvement
C. less tissue superimposition
D. relaxed quality control
E. reduced patient dose


C. less tissue superimposition


Compared to CT, film/screen radiography will give
1. better spatial resolution
2. lower entrance surface dose for a single image
3. lower tube heating for a single image
4. better low contrast resolution

A. Only 1 and 3 are correct
B. All are correct
C. Only 1, 2, and 3 are correct
D. Only 2 and 4 are correct
E. Only 4 is correct


C. Only 1, 2, and 3 are correct


Which of the following is a characteristic of a first-generation CT Imager?
A. pencil beam
B. detector array
C. rotate geometry
D. fan beam
E. slip ring technology


A. pencil beam


Which of the following CT imagers is often referred to as the heart scan?
A. third generation
B. electron beam
C. second generation
D. fourth generation
E. spiral


B. spiral


Which of the following is a particular characteristic of fourth-generation CT imagers?
A. fan x-ray beam geometry
B. 1 s imaging time
C. multielement detector array
D. rotate-translate motion
E. fixed detector array


E. fixed detector array


Which of the following CT imagers has no mechanical moving parts in the gantry?
A. electron beam
B. third generation
C. second generation
D. spiral
E. fourth generation


A. electron beam


Which of the following is characteristic of a first-generation CT imager?
A. slip ring technology
B. rotate beam
C. fan beam
D. detector array
E. five minute imaging time


E. five minute imaging time


6. Which of the following features led to the development of the spiral CT imager?
A. electronic slip rings
B. megaheat unit x-ray tubes
C. high-frequency generator
D. molybdenum/rhodium targeted x-ray tubes
E. fast reconstruction algorithms


A. electronic slip rings


Ring artifacts are characteristic of
A. third-generation CT
B. fourth-generation CT
C. second-generation CT
D. first-generation CT
E. spiral CT


A. third-generation CT


Which of the following is characteristic of a second-generation CT imager?
A. pencil-shaped x-ray beam
B. translate-rotate motion
C. single image projection per translation
D. able to image head only, not body
E. five minute imaging time


B. translate-rotate motion


The principal advantage to electron beam CT (EBCT) is
A. removal of ring artifacts
B. one second imaging time
C. subsecond imaging time
D. large volume imaging
E. imaging without x-rays


C. subsecond imaging time


During spiral CT, the motion of the patient couch is
A. stationary
B. advanced step wise
C. continuously advanced
D. alternating advance retreat
E. rotating


C. continuously advanced


Which of the following is characteristic of a second-generation CT imager?
A. thirty second imaging time
B. single image projection per translation
C. pencil-shaped x-ray beam
D. able to image head only , not body
E. five minute imaging time


A. thirty second imaging time


Which of following the are characteristic of a first-generation CT imager?
1. pencil beam
2. single detector
3. translate-rotate motion
4. no body imaging

A. only 2 and 4 are correct
B. only 4 is correct
C. all are correct
D. only 1 and 3 are correct
E. only 1,2, and 3 are correct


C. all are correct


Current design of electron CT (EBCT) allows for simultaneous production of
A. eight slices
B. sixteen slices
C. a single slice
D. four slices
E. two slices


D. four slices


Which of the following is characteristic of a second-generation CT imager?
1. fan-shaped x-ray beam
2. detector array
3. translate-rotate motion
4. capable of imaging head and body

A. Only 2 and 4 are correct
B. Only 1 and 3 are correct
C. Only 4 is correct
D. All are correct
E. Only 1,2, and 3 are correct


D. All are correct


X-radiation produced by an electron beam CT (EBCT) imager is emitted from a/an
A. rotating tungsten
B. fixed tungsten semicircular ring
C. electron plasma
D. electron tungsten plasma
E. rotating semicircular tungsten ring


B. fixed tungsten semicircular ring