Chapter 21 Computed Tomography Bushong: Radiologic Science for Technologists
MULTIPLE CHOICE
1. Each sweep of the source-detector around the body during CT is called a _ .
a. rotation
b. reconstruction
c. translation
d. projection
ANS: C
Each sweep of the source-detector around the body during CT is called a translation.
2. Each CT projection records variations in .
a. density and contrast
b. motion and noise
c. spatial resolution and contrast resolution
d. mass density and effective atomic number
ANS: D
Each CT projection records variations in mass density and effective atomic number.
3. Each CT projection is .
a. displayed on the monitor
b. stored on the computer
c. printed on film
d. saved on a disk
, ANS: B
Each CT projection is stored on the computer.
4. The cross-sectional anatomy is translated into during CT reconstruction. a. an
intensity profile
b. attenuation patterns
c. a matrix of values
d. effective atomic numbers
ANS: C
The cross-sectional anatomy is translated into a matrix of values during CT
reconstruction.
5. The first generation of computed tomography used detector(s). a. one
b. two
c. three
d. four
ANS: A
The first generation of computed tomography used one detector.
6. The principal drawback of the first-generation CT scanner was the
. a. high patient dose
b. long scanning time
c. translate-rotate assembly
d. degree of rotation
, ANS: B
The principal drawback of the first-generation CT scanner was the long scanning time.
7. The second-generation CT scanners had the disadvantage of increased
. a. beam scatter
b. scanning time
c. ring artifacts
d. number of translations
ANS: A
The second-generation CT scanners had the disadvantage of increased beam scatter.
8. The reduction in was the principal advantage of the second-
generation CT scanners.
a. image noise
b. patient dose
c. scanning time
d. scatter radiation
ANS: C
The reduction in scanning time was the principal advantage of the second-
generation CT scanners.
9. The third generation of CT scanners allowed for further reduction in
. a. scanning time
b. scattered radiation
MULTIPLE CHOICE
1. Each sweep of the source-detector around the body during CT is called a _ .
a. rotation
b. reconstruction
c. translation
d. projection
ANS: C
Each sweep of the source-detector around the body during CT is called a translation.
2. Each CT projection records variations in .
a. density and contrast
b. motion and noise
c. spatial resolution and contrast resolution
d. mass density and effective atomic number
ANS: D
Each CT projection records variations in mass density and effective atomic number.
3. Each CT projection is .
a. displayed on the monitor
b. stored on the computer
c. printed on film
d. saved on a disk
, ANS: B
Each CT projection is stored on the computer.
4. The cross-sectional anatomy is translated into during CT reconstruction. a. an
intensity profile
b. attenuation patterns
c. a matrix of values
d. effective atomic numbers
ANS: C
The cross-sectional anatomy is translated into a matrix of values during CT
reconstruction.
5. The first generation of computed tomography used detector(s). a. one
b. two
c. three
d. four
ANS: A
The first generation of computed tomography used one detector.
6. The principal drawback of the first-generation CT scanner was the
. a. high patient dose
b. long scanning time
c. translate-rotate assembly
d. degree of rotation
, ANS: B
The principal drawback of the first-generation CT scanner was the long scanning time.
7. The second-generation CT scanners had the disadvantage of increased
. a. beam scatter
b. scanning time
c. ring artifacts
d. number of translations
ANS: A
The second-generation CT scanners had the disadvantage of increased beam scatter.
8. The reduction in was the principal advantage of the second-
generation CT scanners.
a. image noise
b. patient dose
c. scanning time
d. scatter radiation
ANS: C
The reduction in scanning time was the principal advantage of the second-
generation CT scanners.
9. The third generation of CT scanners allowed for further reduction in
. a. scanning time
b. scattered radiation
