CT EXAM EVALUATION QUESTIONS WITH ANSWERS
GRADED A+ 2025/2026
Which of the following statements about multislice CT is true?
Select one:
a. Higher-resolution multislice spiral CT results in low patient radiation dose.
b. Larger detector size results in better spatial resolution.
c. Narrower slice scanning results in better contrast resolution at the same mA.
d. The simplest approach to multislice scanning is the use of eight detector arrays, each
of equal width.
e. Wider multislices allow imaging of a greater tissue volume. - e. Wider multislices
allow imaging of a greater tissue volume.
A principal advantage of reconstruction in any z-axis position is:
Select one:
a. Image acquisition during a single breath-hold.
b. Improved contrast resolution.
c. Improved spatial resolution.
d. Larger volume of tissue imaged.
e. Reduction of partial volume. - e. Reduction of partial volume.
During a 360-degree x-ray rotation, the patient couch moves 15 mm during each
revolution. Slice thickness is 10 mm. What is the slice pitch?
Select one:
a. 0.66
b. 1.25
c. 1.5
d. 1.66
e. 2.0 - c. 1.5
TEST QUESTION
CT x-ray tubes produce a massive amount of heat as compared to conventional
radiographic tubes.
Select one:
True
False - True
A series of tissue density values that evolved for CT measurements is called _____
units.
Select one:
a. Hounsfield
b. SI
c. Attenuation
d. All of the above - a. Hounsfield
,CT is able to differentiate between tissues with similar densities compared with
conventional radiography due to:
Select one:
a. digital magnification
b. the use of a computer for data processing
c. improved contrast resolution
d. axial slices - c. improved contrast resolution
TEST QUESTION
Which of the following technique developments made spiral CT possible?
Select one:
a. Dose-efficiency detectors
b. High-frequency generators
c. Interpolation algorithms
d. Slip rings
e. Volume imaging - d. Slip rings
Noise on a CT image can be reduced by:
Select one:
a. Increasing kVp
b. Increasing mAs
c. Increasing matrix size
d. Reducing image time
e. Reducing pixel size - b. Increasing mAs
TEST QUESTION
Slice thickness can also be expressed as which of the following?
Select one:
a. Dose profile
b. Low-contrast resolution
c. Resolution profile
d. Sensitivity profile
e. Spatial profile - d. Sensitivity profile
The thickness of section in CT depends primarily on:
Select one:
a. kVp
b. mAs
c. Matrix size
d. Predetector collimation
e. Prepatient collimation - d. Predetector collimation
A _____ artifact is caused by motion when performing CT examinations.
Select one:
a. beam-hardening
b. ring
, c. star
d. streak - d. streak
Dose in CT is considered to be:
Select one:
a. independent of size
b. size dependent
c. related to the CT numbers
d. similar to a chest examination - b. size dependent
A Hounsfield unit:
Select one:
a. Has a value from -100 to +100.
b. Has a value from -500 to +500.
c. Is the numerical value of a pixel.
d. Is the numerical value of anode heat generated.
e. Is the volume of a voxel expressed in mm3. - c. Is the numerical value of a pixel.
During spiral CT examination of a supine patient, the z-axis:
Select one:
a. Is the anterior-posterior axis.
b. Is the lateral axis, left to right.
c. Is the lateral axis, right to left.
d. Is the long axis of the body.
e. Varies with the examination. - d. Is the long axis of the body.
Streak artifacts on a CT image are usually due to:
Select one:
a. Beam Hardening
b. Bone/soft tissue interface
c. Bowel gas
d. Detector imbalance
e. Metal clips - e. Metal clips
TEST QUESTION
The primary advantage to the helical scanner is that a full 360-degree set of data is
acquired for each section.
Select one:
True
False - False
Motion on a CT image is a function of exposure time.
Select one:
True
False - True
GRADED A+ 2025/2026
Which of the following statements about multislice CT is true?
Select one:
a. Higher-resolution multislice spiral CT results in low patient radiation dose.
b. Larger detector size results in better spatial resolution.
c. Narrower slice scanning results in better contrast resolution at the same mA.
d. The simplest approach to multislice scanning is the use of eight detector arrays, each
of equal width.
e. Wider multislices allow imaging of a greater tissue volume. - e. Wider multislices
allow imaging of a greater tissue volume.
A principal advantage of reconstruction in any z-axis position is:
Select one:
a. Image acquisition during a single breath-hold.
b. Improved contrast resolution.
c. Improved spatial resolution.
d. Larger volume of tissue imaged.
e. Reduction of partial volume. - e. Reduction of partial volume.
During a 360-degree x-ray rotation, the patient couch moves 15 mm during each
revolution. Slice thickness is 10 mm. What is the slice pitch?
Select one:
a. 0.66
b. 1.25
c. 1.5
d. 1.66
e. 2.0 - c. 1.5
TEST QUESTION
CT x-ray tubes produce a massive amount of heat as compared to conventional
radiographic tubes.
Select one:
True
False - True
A series of tissue density values that evolved for CT measurements is called _____
units.
Select one:
a. Hounsfield
b. SI
c. Attenuation
d. All of the above - a. Hounsfield
,CT is able to differentiate between tissues with similar densities compared with
conventional radiography due to:
Select one:
a. digital magnification
b. the use of a computer for data processing
c. improved contrast resolution
d. axial slices - c. improved contrast resolution
TEST QUESTION
Which of the following technique developments made spiral CT possible?
Select one:
a. Dose-efficiency detectors
b. High-frequency generators
c. Interpolation algorithms
d. Slip rings
e. Volume imaging - d. Slip rings
Noise on a CT image can be reduced by:
Select one:
a. Increasing kVp
b. Increasing mAs
c. Increasing matrix size
d. Reducing image time
e. Reducing pixel size - b. Increasing mAs
TEST QUESTION
Slice thickness can also be expressed as which of the following?
Select one:
a. Dose profile
b. Low-contrast resolution
c. Resolution profile
d. Sensitivity profile
e. Spatial profile - d. Sensitivity profile
The thickness of section in CT depends primarily on:
Select one:
a. kVp
b. mAs
c. Matrix size
d. Predetector collimation
e. Prepatient collimation - d. Predetector collimation
A _____ artifact is caused by motion when performing CT examinations.
Select one:
a. beam-hardening
b. ring
, c. star
d. streak - d. streak
Dose in CT is considered to be:
Select one:
a. independent of size
b. size dependent
c. related to the CT numbers
d. similar to a chest examination - b. size dependent
A Hounsfield unit:
Select one:
a. Has a value from -100 to +100.
b. Has a value from -500 to +500.
c. Is the numerical value of a pixel.
d. Is the numerical value of anode heat generated.
e. Is the volume of a voxel expressed in mm3. - c. Is the numerical value of a pixel.
During spiral CT examination of a supine patient, the z-axis:
Select one:
a. Is the anterior-posterior axis.
b. Is the lateral axis, left to right.
c. Is the lateral axis, right to left.
d. Is the long axis of the body.
e. Varies with the examination. - d. Is the long axis of the body.
Streak artifacts on a CT image are usually due to:
Select one:
a. Beam Hardening
b. Bone/soft tissue interface
c. Bowel gas
d. Detector imbalance
e. Metal clips - e. Metal clips
TEST QUESTION
The primary advantage to the helical scanner is that a full 360-degree set of data is
acquired for each section.
Select one:
True
False - False
Motion on a CT image is a function of exposure time.
Select one:
True
False - True
