1. What is the primary disadvantage of CT imaging when compared to
MRI?
A. CT scans are more expensive than MRIs
B. CT imaging cannot visualize soft tissues as well as MRI
C. CT scanning takes longer than MRI
D. CT imaging cannot be used for abdominal scans
Answer: B) CT imaging cannot visualize soft tissues as well as MRI
Rationale: MRI generally provides better soft tissue contrast than CT,
making it more suitable for imaging the brain, spinal cord, and muscles,
whereas CT is better for detecting bone and calcified structures.
2. Which of the following factors can influence the radiation dose in a
CT scan?
A. Slice thickness
B. Scan time
C. Patient size
D. All of the above
Answer: D) All of the above
Rationale: Radiation dose in CT scans can be influenced by multiple
factors, including slice thickness, scan time, and patient size. Adjusting
these parameters helps to balance image quality and minimize dose.
,3. What is the purpose of using a contrast agent in a CT scan?
A. To reduce the exposure to radiation
B. To make the blood vessels and certain organs more visible
C. To enhance the scanning process and reduce artifacts
D. To correct for motion during the scan
Answer: B) To make the blood vessels and certain organs more visible
Rationale: Contrast agents, typically iodine-based, are used in CT scans
to improve the visibility of blood vessels, soft tissues, and organs,
enhancing the ability to detect abnormalities.
4. Which of the following factors has the greatest influence on the
quality of a CT image?
A. The amount of contrast used
B. The number of X-ray tubes in the scanner
C. The slice thickness and reconstruction algorithms
D. The patient's body position
Answer: C) The slice thickness and reconstruction algorithms
Rationale: The quality of CT images is highly dependent on the slice
thickness and the algorithms used for reconstruction. Thinner slices
often provide higher image resolution, and advanced algorithms
improve clarity and detail.
, 5. Which of the following is an example of an artifact commonly seen in
CT imaging?
A. Decreased contrast resolution
B. Motion artifact due to patient movement
C. Increased slice thickness
D. Improved tissue differentiation
Answer: B) Motion artifact due to patient movement
Rationale: Motion artifacts are common in CT imaging when the
patient moves during the scan. This can result in blurred or distorted
images, especially in fast-moving organs like the heart and lungs.
6. What is the primary function of the gantry in a CT scanner?
A. To rotate the X-ray tube and detectors around the patient
B. To hold the patient in position during scanning
C. To control the computer system that processes images
D. To store contrast agents for injection
Answer: A) To rotate the X-ray tube and detectors around the patient
Rationale: The gantry is the part of the CT scanner that houses the X-
ray tube and detectors. It rotates around the patient to capture cross-
sectional images from different angles.
7. Which structure is most likely to be visible with a CT scan due to its
high contrast relative to surrounding tissues?
MRI?
A. CT scans are more expensive than MRIs
B. CT imaging cannot visualize soft tissues as well as MRI
C. CT scanning takes longer than MRI
D. CT imaging cannot be used for abdominal scans
Answer: B) CT imaging cannot visualize soft tissues as well as MRI
Rationale: MRI generally provides better soft tissue contrast than CT,
making it more suitable for imaging the brain, spinal cord, and muscles,
whereas CT is better for detecting bone and calcified structures.
2. Which of the following factors can influence the radiation dose in a
CT scan?
A. Slice thickness
B. Scan time
C. Patient size
D. All of the above
Answer: D) All of the above
Rationale: Radiation dose in CT scans can be influenced by multiple
factors, including slice thickness, scan time, and patient size. Adjusting
these parameters helps to balance image quality and minimize dose.
,3. What is the purpose of using a contrast agent in a CT scan?
A. To reduce the exposure to radiation
B. To make the blood vessels and certain organs more visible
C. To enhance the scanning process and reduce artifacts
D. To correct for motion during the scan
Answer: B) To make the blood vessels and certain organs more visible
Rationale: Contrast agents, typically iodine-based, are used in CT scans
to improve the visibility of blood vessels, soft tissues, and organs,
enhancing the ability to detect abnormalities.
4. Which of the following factors has the greatest influence on the
quality of a CT image?
A. The amount of contrast used
B. The number of X-ray tubes in the scanner
C. The slice thickness and reconstruction algorithms
D. The patient's body position
Answer: C) The slice thickness and reconstruction algorithms
Rationale: The quality of CT images is highly dependent on the slice
thickness and the algorithms used for reconstruction. Thinner slices
often provide higher image resolution, and advanced algorithms
improve clarity and detail.
, 5. Which of the following is an example of an artifact commonly seen in
CT imaging?
A. Decreased contrast resolution
B. Motion artifact due to patient movement
C. Increased slice thickness
D. Improved tissue differentiation
Answer: B) Motion artifact due to patient movement
Rationale: Motion artifacts are common in CT imaging when the
patient moves during the scan. This can result in blurred or distorted
images, especially in fast-moving organs like the heart and lungs.
6. What is the primary function of the gantry in a CT scanner?
A. To rotate the X-ray tube and detectors around the patient
B. To hold the patient in position during scanning
C. To control the computer system that processes images
D. To store contrast agents for injection
Answer: A) To rotate the X-ray tube and detectors around the patient
Rationale: The gantry is the part of the CT scanner that houses the X-
ray tube and detectors. It rotates around the patient to capture cross-
sectional images from different angles.
7. Which structure is most likely to be visible with a CT scan due to its
high contrast relative to surrounding tissues?
