CAMRT Fluoroscopy and Interventional Radiography

Question 1

What is the primary characteristic that distinguishes fluoroscopy from conventional radiography?

Accepted Answer

It provides real-time, continuous X-ray imaging

Answer

It uses a lower kVp than conventional radiography

Answer

It requires significantly higher mAs than static imaging

Answer

It eliminates the need for radiation protection measures

Question 2

In a conventional image intensifier, what is the correct sequence of conversions that produces a visible fluoroscopic image?

Accepted Answer

X-rays → input phosphor (light) → photocathode (electrons) → output phosphor (light) → TV camera

Answer

X-rays → electrons → light → TV camera

Answer

X-rays → photocathode → input phosphor → electrons → TV camera

Answer

X-rays → TV camera → phosphor → electrons

Question 3

What is the typical entrance skin dose rate range during standard fluoroscopy?

Accepted Answer

1–10 mGy/min

Answer

0.01–0.1 mGy/min

Answer

50–100 mGy/min

Answer

500–1000 mGy/min

Question 4

What is the function of the 'last image hold' (LIH) feature in fluoroscopic equipment?

Accepted Answer

It displays the most recently acquired fluoroscopic frame as a static image without ongoing radiation

Answer

It permanently archives all fluoroscopic frames to PACS

Answer

It reduces the image refresh rate to lower dose during dynamic runs

Answer

It automatically records a cine loop of the entire procedure

Question 5

What is the primary purpose of the automatic brightness control (ABC) system in a fluoroscopic unit?

Accepted Answer

To automatically adjust kVp and/or mA to maintain consistent image brightness as attenuation changes

Answer

To adjust room ambient lighting for optimal monitor viewing conditions

Answer

To control the speed at which the image intensifier rotates during the study

Answer

To set the black-and-white contrast ratio on the display monitor

Question 6

During a barium swallow examination, why are multiple projections (AP, lateral, oblique) obtained rather than a single view?

Accepted Answer

To comprehensively evaluate esophageal anatomy and function from all angles and detect lesions that may be obscured in one view

Answer

To reduce total radiation dose by spreading exposure over multiple positions

Answer

Because a single lateral view is insufficient for contrast media flow

Answer

To comply with mandatory CAMRT positioning protocols

Question 7

At what cumulative fluoroscopic time does most current guidance recommend that the operator be alerted to monitor for potential high skin dose?

Accepted Answer

5 minutes

Answer

1 minute

Answer

30 minutes

Answer

60 minutes