Radiology Practice

20 learning units • 10 questions per unit • 200 explained questions

Module 06 — CT, Windows & Cross-Sectional Anatomy

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Question 01 • Single best answer

What does CT reconstruct from X-ray measurements?

A. Only a surface photograph B. Only a Doppler waveform C. Only a map of radioisotope uptake D. Cross-sectional images

Question 02 • Single best answer

What is the approximate CT value of water?

A. Minus one thousand Hounsfield units B. Always the same as cortical bone C. A value determined only by heart rate D. Zero Hounsfield units

Question 03 • Single best answer

Which material typically has a negative CT attenuation value?

A. Fat B. Dense cortical bone C. Metal D. Concentrated iodinated contrast

Question 04 • Single best answer

What is partial-volume averaging?

A. Mixing tissue contributions within a voxel B. A new form of intravenous contrast C. The absence of all reconstruction D. A measurement of pulse rate

Question 05 • Single best answer

What does window level chiefly select?

A. The patient’s radiation exposure directly B. The number of contrast injections C. The scan table height alone D. The center of the displayed attenuation range

Question 06 • Single best answer

Does changing from soft-tissue to lung windows require a new radiation exposure?

A. Yes, every window requires rescanning B. No, it changes display of acquired data C. Only if the image is digital D. Always for an adult

Question 07 • Single best answer

Why does contrast phase matter?

A. All tissues enhance identically at every time B. It affects only the printed report C. Enhancement changes over time after injection D. It removes the need for clinical information

Question 08 • Single best answer

Can a routine enhanced chest CT always replace a CT pulmonary angiogram?

A. Yes, any injected contrast is equivalent B. Yes, if the chest is fully covered C. Only if a radiograph is also obtained D. No, pulmonary arterial timing and technique are specific

Question 09 • Single best answer

How are axial CT images conventionally displayed?

A. Always as if viewed from above the head B. As if viewed from the patient’s feet C. Without any left-right orientation D. Only in the sagittal plane

Question 10 • Single best answer

Why review multiple adjacent CT sections?

A. To increase the patient’s dose B. To confirm anatomy and continuity of findings C. To make every lesion malignant D. To avoid using any reformats