ARRT CT Physics

Question 1

What does CT stand for in medical imaging?

Accepted Answer

Computed Tomography

Answer

Cardiac Testing

Answer

Clinical Therapy

Answer

Central Treatment

Question 2

What is the primary advantage of CT over conventional X-ray?

Accepted Answer

CT provides cross-sectional images with superior soft tissue contrast

Answer

CT uses no radiation

Answer

CT is cheaper

Answer

CT takes less time

Question 3

What is the purpose of contrast media in CT scans?

Accepted Answer

To enhance the visibility of specific structures and pathology

Answer

To reduce radiation dose

Answer

To speed up the scan

Answer

To make the patient comfortable

Question 4

What is the ALARA principle in radiation safety?

Accepted Answer

As Low As Reasonably Achievable — minimize radiation exposure

Answer

Always Lock And Restrict Access

Answer

Automated Limiting Adjustment for Radiation Applications

Answer

All Labs And Rooms Assessed

Question 5

What is a Hounsfield unit?

Accepted Answer

A quantitative measurement of tissue density on CT images

Answer

A unit of radiation dose

Answer

A measure of scan speed

Answer

A unit of image resolution

Question 6

What is the window level and window width on CT images?

Accepted Answer

Settings that control the brightness and contrast of displayed images

Answer

Physical measurements of the CT scanner

Answer

Patient positioning parameters

Answer

Scan speed controls