Radiography Exam Fluoroscopy and Interventional Procedures

Question 1

What is the primary function of the image intensifier in a fluoroscopic system?

Accepted Answer

To amplify and convert X-ray energy into a brightened visible image, reducing patient dose

Answer

To increase kVp automatically during exposure

Answer

To collimate the X-ray beam to the area of interest

Answer

To process and store digital images in PACS

Question 2

Per FDA regulations (21 CFR 1020.32), what is the maximum air kerma rate at the reference point for standard fluoroscopic systems?

Accepted Answer

88 mGy/min

Answer

50 mGy/min

Answer

120 mGy/min

Answer

25 mGy/min

Question 3

What is the primary advantage of pulsed fluoroscopy over continuous fluoroscopy?

Accepted Answer

Reduced patient radiation dose

Answer

Higher spatial resolution

Answer

Increased frame rate per second

Answer

Better contrast visualization at low kVp

Question 4

What does the 'last image hold' (LIH) feature do in a fluoroscopic system?

Accepted Answer

Displays the final fluoroscopic frame as a static image after the beam is turned off

Answer

Records all fluoroscopic images automatically throughout the procedure

Answer

Holds the X-ray beam at a fixed intensity while the foot pedal is depressed

Answer

Stores the highest quality image of the exam for permanent record

Question 5

What is the primary purpose of automatic brightness control (ABC) in fluoroscopy?

Accepted Answer

To automatically adjust technical factors to maintain consistent image brightness as beam penetration changes

Answer

To increase the frame rate of image acquisition

Answer

To reduce the physical size of the image intensifier

Answer

To automatically store images at preset time intervals

Question 6

What is the minimum source-to-skin distance (SSD) required for fixed fluoroscopic equipment per FDA regulations?

Accepted Answer

38 cm (15 inches)

Answer

20 cm (8 inches)

Answer

30 cm (12 inches)

Answer

45 cm (18 inches)

Question 7

What is the primary purpose of spot imaging during a fluoroscopic examination?

Accepted Answer

To record selected high-quality static images of specific anatomy or pathology for documentation

Answer

To periodically calibrate the image intensifier

Answer

To provide continuous real-time imaging of patient movement

Answer

To measure entrance skin dose at a specific point