Computed Tomography Test CT Radiation Safety and Dosimetry 3

Question 1

Which CT technique reduces dose by acquiring fewer projections and reconstructing with iterative algorithms?

Accepted Answer

Low-dose CT with iterative reconstruction

Answer

High-pitch spiral CT

Answer

Dual-energy CT

Answer

Sequential CT

Question 2

The term 'Z-axis dose profile' in CT refers to dose distribution along which direction?

Accepted Answer

Patient cranio-caudal (head-to-foot) axis

Answer

Left-to-right axis

Answer

Anterior-to-posterior axis

Answer

Rotational axis of the gantry

Question 3

What effect does increasing CT tube voltage (kVp) have on patient dose?

Accepted Answer

Increases dose due to higher photon energy and greater beam penetration

Answer

Decreases dose by reducing scan time

Answer

Has no effect on patient dose

Answer

Reduces dose by hardening the beam

Question 4

In CT fluoroscopy-guided procedures, which group is at highest risk for radiation injury?

Accepted Answer

The interventionalist's hands if placed in the beam

Answer

The patient's eyes

Answer

Technologists monitoring from the control room

Answer

Other patients in adjacent rooms

Question 5

Which regulatory body in the United States sets occupational radiation dose limits for CT technologists?

Accepted Answer

Nuclear Regulatory Commission (NRC)

Answer

FDA

Answer

Joint Commission

Answer

ACR

Question 6

What is the primary shielding material used in CT scanning room walls?

Accepted Answer

Lead or lead-equivalent concrete

Answer

Steel

Answer

Aluminum

Answer

Fiberglass