1. 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.
2. What is the primary principle behind computed tomography (CT)
imaging?
A. Electromagnetic waves
B. X-rays and computer processing
C. Ultrasound and frequency waves
D. Nuclear magnetic resonance
Answer: B) X-rays and computer processing
Rationale: CT imaging works by using X-rays to create cross-sectional
images of the body. A computer processes the X-ray data to generate
detailed images of tissues and organs.
,3. What type of scan would most likely be ordered for the evaluation of
lung cancer?
A. Abdominal CT
B. Thoracic CT with contrast
C. Brain CT
D. CT cystography
Answer: B) Thoracic CT with contrast
Rationale: A thoracic CT with contrast is commonly used to evaluate
lung cancer, as it provides detailed images of the lungs, surrounding
tissues, and lymph nodes to assess for cancerous growths.
4. What does "pitch" refer to in helical CT scanning?
A. The speed at which the scanner rotates
B. The thickness of each slice taken during the scan
C. The ratio of table movement to slice thickness
D. The contrast material used in the scan
Answer: C) The ratio of table movement to slice thickness
Rationale: "Pitch" in helical CT refers to the table movement per slice
thickness, influencing scan speed and image quality. A higher pitch
means faster scanning but potentially lower image quality.
, 5. What is the term used to describe a CT scan image in which both the
brain and skull are visible without requiring any post-processing?
A. Multi-phase imaging
B. High-resolution imaging
C. Soft tissue imaging
D. Bone window setting
Answer: D) Bone window setting
Rationale: A "bone window" setting is used in CT imaging to visualize
dense structures like the skull and bones more clearly, allowing the
brain and skull to be distinctly visible without needing further
enhancement.
6. In CT imaging, what does "beam hardening" refer to?
A. The increase in X-ray intensity as it passes through tissues
B. The softening of images due to motion artifacts
C. The distortion of an image due to a dense object, such as bone
D. The loss of contrast in low-density areas
Answer: C) The distortion of an image due to a dense object, such as
bone
Rationale: Beam hardening occurs when X-rays pass through dense
materials like bone, resulting in a reduction of lower-energy X-rays and
creating streaks or artifacts in the final image.
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.
2. What is the primary principle behind computed tomography (CT)
imaging?
A. Electromagnetic waves
B. X-rays and computer processing
C. Ultrasound and frequency waves
D. Nuclear magnetic resonance
Answer: B) X-rays and computer processing
Rationale: CT imaging works by using X-rays to create cross-sectional
images of the body. A computer processes the X-ray data to generate
detailed images of tissues and organs.
,3. What type of scan would most likely be ordered for the evaluation of
lung cancer?
A. Abdominal CT
B. Thoracic CT with contrast
C. Brain CT
D. CT cystography
Answer: B) Thoracic CT with contrast
Rationale: A thoracic CT with contrast is commonly used to evaluate
lung cancer, as it provides detailed images of the lungs, surrounding
tissues, and lymph nodes to assess for cancerous growths.
4. What does "pitch" refer to in helical CT scanning?
A. The speed at which the scanner rotates
B. The thickness of each slice taken during the scan
C. The ratio of table movement to slice thickness
D. The contrast material used in the scan
Answer: C) The ratio of table movement to slice thickness
Rationale: "Pitch" in helical CT refers to the table movement per slice
thickness, influencing scan speed and image quality. A higher pitch
means faster scanning but potentially lower image quality.
, 5. What is the term used to describe a CT scan image in which both the
brain and skull are visible without requiring any post-processing?
A. Multi-phase imaging
B. High-resolution imaging
C. Soft tissue imaging
D. Bone window setting
Answer: D) Bone window setting
Rationale: A "bone window" setting is used in CT imaging to visualize
dense structures like the skull and bones more clearly, allowing the
brain and skull to be distinctly visible without needing further
enhancement.
6. In CT imaging, what does "beam hardening" refer to?
A. The increase in X-ray intensity as it passes through tissues
B. The softening of images due to motion artifacts
C. The distortion of an image due to a dense object, such as bone
D. The loss of contrast in low-density areas
Answer: C) The distortion of an image due to a dense object, such as
bone
Rationale: Beam hardening occurs when X-rays pass through dense
materials like bone, resulting in a reduction of lower-energy X-rays and
creating streaks or artifacts in the final image.
