VIR Radiation Safety & Protection 2

Question 1

Where should the primary monitoring dosimeter badge be worn when a lead apron is used in the VIR suite?

Accepted Answer

At the collar level, outside the lead apron

Answer

At the waist, underneath the lead apron

Answer

On the wrist of the dominant hand

Answer

On the forehead beneath the surgical cap

Question 2

The lead equivalency of a standard full wrap-around lead apron used in interventional radiology is typically:

Accepted Answer

0.5 mm Pb equivalent

Answer

0.1 mm Pb equivalent

Answer

0.25 mm Pb equivalent

Answer

1.0 mm Pb equivalent

Question 3

Which action most effectively reduces patient entrance skin dose during fluoroscopy?

Accepted Answer

Placing the image receptor close to the patient

Answer

Keeping the image receptor as far from the patient as possible

Answer

Using maximum kVp throughout the procedure

Answer

Increasing the source-to-skin distance while moving the detector away

Question 4

Pulsed fluoroscopy reduces radiation dose compared to continuous fluoroscopy primarily because:

Accepted Answer

Radiation is only emitted during discrete pulses rather than continuously

Answer

It reduces tube voltage (kVp) during each pulse

Answer

It automatically collimates the beam to a smaller field

Answer

It increases the source-to-patient distance

Question 5

The recommended annual occupational dose limit for the lens of the eye according to NCRP Report 116 is:

Accepted Answer

150 mSv (15 rem)

Answer

15 mSv (1.5 rem)

Answer

50 mSv (5 rem)

Answer

500 mSv (50 rem)

Question 6

Which practice most effectively reduces scatter radiation dose to the VIR operator's hands during procedures?

Accepted Answer

Using long instruments to maintain maximum distance from the X-ray beam

Answer

Wearing lead gloves at all times during imaging

Answer

Increasing the fluoroscopy frame rate to shorten total procedure time

Answer

Switching from fluoroscopy to DSA for all imaging

Question 7

The 'last image hold' (LIH) feature on fluoroscopy equipment is designed to:

Accepted Answer

Retain the final fluoroscopic frame on the monitor without continued radiation emission

Answer

Record the highest dose rate achieved during the procedure for regulatory reporting

Answer

Automatically optimize the next exposure based on prior image quality

Answer

Store all images for the legally required retention period