ARRT Contrast Media

Question 1

What does CT stand for in medical imaging?

Accepted Answer

Computed Tomography

Answer

CT (Computed Tomography) uses X-ray technology and computer processing to create detailed cross-sectional images of the body.

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 provides detailed cross-sectional images with much better soft tissue contrast resolution than conventional X-rays, allowing visualization of subtle differences between tissues.

Question 3

What is the purpose of contrast media in CT scans?

Accepted Answer

To enhance the visibility of specific structures and pathology

Answer

Contrast media (dye) enhances the visibility of blood vessels, organs, and abnormalities by changing how X-rays interact with specific tissues.

Question 4

What is the ALARA principle in radiation safety?

Accepted Answer

As Low As Reasonably Achievable — minimize radiation exposure

Answer

ALARA means keeping radiation doses as low as reasonably achievable while still obtaining diagnostic-quality images, balancing benefit against risk.

Question 5

What is a Hounsfield unit?

Accepted Answer

A quantitative measurement of tissue density on CT images

Answer

Hounsfield units (HU) measure tissue density on CT, with water at 0 HU, air at -1000 HU, and dense bone at +1000 HU or higher.

(ARRT) American Registry of Radiologic Technologists Computed Tomography Certification Practice Test

(ARRT) American Registry of Radiologic Technologists Computed Tomography Certification Practice Test

ARRT Contrast Media