1. 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.
2. Which of the following organs or tissues has the highest attenuation
on a CT scan?
A. Bone
B. Fat
C. Liver
D. Air
Answer: A) Bone
Rationale: Bone has a high attenuation on a CT scan because it absorbs
more X-rays compared to other tissues. This results in it appearing
white or bright on the scan images.
,3. Which type of CT scanner utilizes multiple rows of detectors for data
acquisition?
A. Single-detector CT
B. Multi-detector CT (MDCT)
C. Positron emission tomography (PET)
D. Helical CT
Answer: B) Multi-detector CT (MDCT)
Rationale: Multi-detector CT (MDCT) uses multiple rows of detectors
to capture data, which increases the speed of scanning and improves
image resolution compared to single-detector systems.
4. What does the term "multiplanar reconstruction" (MPR) refer to in
CT imaging?
A. Using multiple scans from different machines
B. Reconstructing the image into different planes (axial, sagittal,
coronal)
C. Using multiple contrast agents for enhanced imaging
D. Combining data from CT and MRI scans
Answer: B) Reconstructing the image into different planes (axial,
sagittal, coronal)
Rationale: MPR refers to the ability to reconstruct CT data into
various planes (such as axial, sagittal, or coronal) for better
visualization of structures and abnormalities.
, 5. Which of the following is a characteristic feature of a "fatty liver" on
a CT scan?
A. Increased attenuation due to the presence of fat
B. Decreased attenuation because of the low density of fat
C. High contrast between the liver and surrounding tissues
D. No visible changes in attenuation when compared to normal liver
tissue
Answer: B) Decreased attenuation because of the low density of fat
Rationale: Fatty liver appears less dense on a CT scan, which leads to a
decreased attenuation. It often appears darker than normal liver tissue,
as fat has lower attenuation values than other soft tissues.
6. Which structure is most likely to be visible with a CT scan due to its
high contrast relative to surrounding tissues?
A. Brain tissue
B. Fat
C. Bone
D. Lung tissue
Answer: C) Bone
Rationale: Bone has a high density and attenuates X-rays more than
soft tissues, making it appear white (high contrast) on a CT scan.
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.
2. Which of the following organs or tissues has the highest attenuation
on a CT scan?
A. Bone
B. Fat
C. Liver
D. Air
Answer: A) Bone
Rationale: Bone has a high attenuation on a CT scan because it absorbs
more X-rays compared to other tissues. This results in it appearing
white or bright on the scan images.
,3. Which type of CT scanner utilizes multiple rows of detectors for data
acquisition?
A. Single-detector CT
B. Multi-detector CT (MDCT)
C. Positron emission tomography (PET)
D. Helical CT
Answer: B) Multi-detector CT (MDCT)
Rationale: Multi-detector CT (MDCT) uses multiple rows of detectors
to capture data, which increases the speed of scanning and improves
image resolution compared to single-detector systems.
4. What does the term "multiplanar reconstruction" (MPR) refer to in
CT imaging?
A. Using multiple scans from different machines
B. Reconstructing the image into different planes (axial, sagittal,
coronal)
C. Using multiple contrast agents for enhanced imaging
D. Combining data from CT and MRI scans
Answer: B) Reconstructing the image into different planes (axial,
sagittal, coronal)
Rationale: MPR refers to the ability to reconstruct CT data into
various planes (such as axial, sagittal, or coronal) for better
visualization of structures and abnormalities.
, 5. Which of the following is a characteristic feature of a "fatty liver" on
a CT scan?
A. Increased attenuation due to the presence of fat
B. Decreased attenuation because of the low density of fat
C. High contrast between the liver and surrounding tissues
D. No visible changes in attenuation when compared to normal liver
tissue
Answer: B) Decreased attenuation because of the low density of fat
Rationale: Fatty liver appears less dense on a CT scan, which leads to a
decreased attenuation. It often appears darker than normal liver tissue,
as fat has lower attenuation values than other soft tissues.
6. Which structure is most likely to be visible with a CT scan due to its
high contrast relative to surrounding tissues?
A. Brain tissue
B. Fat
C. Bone
D. Lung tissue
Answer: C) Bone
Rationale: Bone has a high density and attenuates X-rays more than
soft tissues, making it appear white (high contrast) on a CT scan.
