ARRT Fluoroscopy and Special Procedures

Question 1

What is the primary advantage of fluoroscopy over static radiography?

Accepted Answer

It allows real-time dynamic visualization of structures and motion

Answer

Fluoroscopy provides continuous real-time imaging, allowing the radiologist to observe dynamic processes such as swallowing, bowel peristalsis, and contrast flow.

Question 2

During a barium swallow examination, which position best demonstrates a posterior esophageal impression or defect?

Accepted Answer

RAO projection

Answer

The RAO (right anterior oblique) position places the esophagus between the spine and the heart, providing an unobstructed view of the esophageal lumen.

Question 3

Which type of contrast agent is routinely used for a double-contrast barium enema?

Accepted Answer

Low-density barium sulfate with air

Answer

Double-contrast barium enema uses low-density (thin) barium to coat the mucosal surface combined with air insufflation to distend the colon and reveal fine mucosal detail.

Question 4

Which fluoroscopic technique most effectively reduces patient entrance skin dose during a procedure?

Accepted Answer

Increasing the kVp and using last image hold instead of continuous fluoroscopy

Answer

Higher kVp reduces dose per image, and using last image hold (LIH) eliminates unnecessary continuous fluoroscopy, significantly reducing cumulative skin exposure.

Question 5

What is the primary function of the image intensifier (II) in a fluoroscopic unit?

Accepted Answer

To convert X-ray energy to a bright visible light image for viewing

Answer

The image intensifier converts X-ray photons into electrons, accelerates them, and reconverts them to a bright visible-light image, enabling real-time observation at low dose rates.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT Fluoroscopy and Special Procedures