Computed Tomography Test CT Radiation Safety and Dosimetry 2

Question 1

The DLP (Dose Length Product) in CT is calculated by multiplying CTDI_vol by which parameter?

Accepted Answer

Scan length

Answer

Slice thickness

Answer

Rotation time

Answer

Pitch factor

Question 2

Which of the following best describes the dose profile of a helical CT scan with a pitch greater than 1?

Accepted Answer

Gaps exist between dose profiles from successive rotations

Answer

Overlapping dose profiles occur

Answer

Dose is uniformly distributed

Answer

Patient dose is eliminated

Question 3

In CT, which body region is most sensitive to radiation-induced cancer risk?

Accepted Answer

Bone marrow and gonads

Answer

Brain

Answer

Extremities

Answer

Skin

Question 4

What is the recommended lead apron shielding thickness to protect gonads from scattered CT radiation?

Accepted Answer

0.5 mm lead equivalent

Answer

0.1 mm lead equivalent

Answer

2.0 mm lead equivalent

Answer

No shielding is needed

Question 5

Which population group requires the most careful dose optimization in CT due to higher radiation sensitivity?

Accepted Answer

Pediatric patients

Answer

Elderly patients

Answer

Athletic adults

Answer

Male patients

Question 6

What does the size-specific dose estimate (SSDE) correct for compared to CTDIvol?

Accepted Answer

Patient body size and diameter

Answer

Scanner manufacturer differences

Answer

Contrast agent type

Answer

Scan protocol complexity