1. What is the most appropriate CT imaging modality to assess for
pulmonary embolism?
A. Abdominal CT
B. Cardiac CT
C. CT pulmonary angiography (CTPA)
D. Brain CT
Answer: C) CT pulmonary angiography (CTPA)
Rationale: CT pulmonary angiography (CTPA) is the gold standard for
diagnosing pulmonary embolism. It uses contrast to highlight the
pulmonary arteries and detect blockages caused by emboli.
2. Which of the following conditions would most benefit from a CT
urography scan?
A. Coronary artery disease
B. Kidney stones
C. Brain tumor
D. Pulmonary embolism
Answer: B) Kidney stones
Rationale: CT urography is an imaging technique used to evaluate the
kidneys, ureters, and bladder, often for conditions like kidney stones,
hematuria, and urinary tract abnormalities.
,3. In CT imaging, what is the term for the unit of measurement used to
quantify the attenuation of X-rays?
A. Gray
B. Sievert
C. Hounsfield unit
D. Decibel
Answer: C) Hounsfield unit
Rationale: The Hounsfield unit (HU) is used to measure the attenuation
of X-rays by different tissues. Water is assigned a value of 0 HU, and
air has a value of -1000 HU, with various tissues and substances falling
between these values.
4. What is the primary risk factor for the development of contrast-
induced nephropathy (CIN)?
A. High blood pressure
B. Age under 30
C. Pre-existing kidney disease
D. Regular physical exercise
Answer: C) Pre-existing kidney disease
Rationale: Contrast-induced nephropathy (CIN) is more common in
patients with pre-existing kidney dysfunction, as their kidneys are less
able to filter the contrast agent effectively.
, 5. What is the typical appearance of a lung with emphysema on a CT
scan?
A. Increased attenuation with white areas
B. Decreased attenuation with dark areas
C. Sharp boundary between lung and surrounding tissues
D. Nodules within the lung parenchyma
Answer: B) Decreased attenuation with dark areas
Rationale: In emphysema, the lung tissue is destroyed, leading to areas
of decreased density, which appear dark on a CT scan due to reduced
tissue attenuation.
6. Which of the following is a common clinical indication for using CT
angiography (CTA)?
A. Evaluation of bone fractures
B. Visualization of soft tissue tumors
C. Assessment of blood vessel abnormalities such as aneurysms
D. Detection of abdominal calcifications
Answer: C) Assessment of blood vessel abnormalities such as
aneurysms
Rationale: CT angiography (CTA) is specifically used to visualize blood
vessels and assess conditions like aneurysms, blockages, or other
vascular abnormalities by using contrast material.
pulmonary embolism?
A. Abdominal CT
B. Cardiac CT
C. CT pulmonary angiography (CTPA)
D. Brain CT
Answer: C) CT pulmonary angiography (CTPA)
Rationale: CT pulmonary angiography (CTPA) is the gold standard for
diagnosing pulmonary embolism. It uses contrast to highlight the
pulmonary arteries and detect blockages caused by emboli.
2. Which of the following conditions would most benefit from a CT
urography scan?
A. Coronary artery disease
B. Kidney stones
C. Brain tumor
D. Pulmonary embolism
Answer: B) Kidney stones
Rationale: CT urography is an imaging technique used to evaluate the
kidneys, ureters, and bladder, often for conditions like kidney stones,
hematuria, and urinary tract abnormalities.
,3. In CT imaging, what is the term for the unit of measurement used to
quantify the attenuation of X-rays?
A. Gray
B. Sievert
C. Hounsfield unit
D. Decibel
Answer: C) Hounsfield unit
Rationale: The Hounsfield unit (HU) is used to measure the attenuation
of X-rays by different tissues. Water is assigned a value of 0 HU, and
air has a value of -1000 HU, with various tissues and substances falling
between these values.
4. What is the primary risk factor for the development of contrast-
induced nephropathy (CIN)?
A. High blood pressure
B. Age under 30
C. Pre-existing kidney disease
D. Regular physical exercise
Answer: C) Pre-existing kidney disease
Rationale: Contrast-induced nephropathy (CIN) is more common in
patients with pre-existing kidney dysfunction, as their kidneys are less
able to filter the contrast agent effectively.
, 5. What is the typical appearance of a lung with emphysema on a CT
scan?
A. Increased attenuation with white areas
B. Decreased attenuation with dark areas
C. Sharp boundary between lung and surrounding tissues
D. Nodules within the lung parenchyma
Answer: B) Decreased attenuation with dark areas
Rationale: In emphysema, the lung tissue is destroyed, leading to areas
of decreased density, which appear dark on a CT scan due to reduced
tissue attenuation.
6. Which of the following is a common clinical indication for using CT
angiography (CTA)?
A. Evaluation of bone fractures
B. Visualization of soft tissue tumors
C. Assessment of blood vessel abnormalities such as aneurysms
D. Detection of abdominal calcifications
Answer: C) Assessment of blood vessel abnormalities such as
aneurysms
Rationale: CT angiography (CTA) is specifically used to visualize blood
vessels and assess conditions like aneurysms, blockages, or other
vascular abnormalities by using contrast material.
