CT is able to differentiate between tissues with similar densities compared with conventional radiography because of
a. digital magnification.
b. the use of a computer for data processing.
c. improved contrast resolution.
d. axial slices. correct answers c. improved contrast resolution
CT pr...
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CT is able to differentiate between tissues with similar densities compared with conventional
radiography because of
a. digital magnification.
b. the use of a computer for data processing.
c. improved contrast resolution.
d. axial slices. correct answers c. improved contrast resolution
CT provides enhanced contrast resolution as compared with conventional radiography due to
a. less radiation.
b. shorter exposure times.
c. a decrease in the amount of scattered radiation.
d. longer SID. correct answers c. a decrease in the amount of scattered radiation
First-generation scanners used a process known as
a. translate/rotate.
b. rotate/rotate.
c. rotate-only.
d. translate/translate. correct answers a. translate/rotate
First-generation scanners had scan times of
a. 30 seconds.
b. 1 to 2 minutes.
c. 3 to 5 minutes.
d. 5 to 10 minutes. correct answers c. 3 to 5 minutes
Which generation of CT scanners emitted a fan-shaped beam?
a. First generation
b. Second generation
c. Fifth generation
d. Sixth generation correct answers b. second generation
Which generation of CT scanners significantly improved image quality with an increased
number of detectors arranged in a curved detector array?
a. Third generation
b. Fourth generation
c. Fifth generation
d. Sixth generation correct answers a. third generation
Third generation scanners reduced scan times to _____ resulting in decreased motion artifact.
a. 1 to 2 minutes
b. 1 to 2 seconds
c. 0.35 seconds to 1 second
d. 0.25 seconds to 1 second correct answers c. 9.35 seconds to 1 second
Which of the following generation of CT scanners provide a higher patient dose per scan?
a. First generation
b. Second generation
c. Third generation
, d. Fourth generation correct answers d. fourth generation
Which generation of CT scanners uses a dual-energy source (two x-ray tubes)?
a. Third generation
b. Fourth generation
c. Fifth generation
d. Sixth generations correct answers d. sixth generation
Which generation of CT scanners is most widely used today?
a. Third generation
b. Fourth generation
c. Fifth generation
d. Sixth generation correct answers a. third generation
A single square or picture element within the matrix is called a
a. pixel.
b. voxel.
c. matrix.
d. scan profile. correct answers a. pixel
An array of numbers arranged in a grid of rows and columns is called a
a. pixel.
b. voxel.
c. matrix.
d. scan profile. correct answers c. matrix
The slice thickness provides a pixel an added dimension, this is called a
a. pixel.
b. voxel.
c. matrix.
d. scan profile. correct answers b. voxel
What is the formula for calculating voxel volume?
a. Voxel x slice thickness
b. Matrix x slice thickness
c. Pixel x slice thickness
d. Matrix/pixel correct answers c. pixel x slice thickness
Which of the following determines the amount of data to be displayed on the monitor?
a. Scan profile
b. Matrix
c. Voxel volume
d. Field of view correct answers d. field of view
The reference material for CT is _____ and is related to the _____ of the tissue.
a. water; field of view
b. water; linear attenuation coefficient
c. muscle; gray level
d. bone; mass attenuation correct answers b. water, linear attenuation coefficient
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