FLUOROSCOPY & INTERVENTIONAL IMAGING BUSHBERG – CHAPTER 9 RSNA & AAPM PHYSICS CURRICULUM: MODULE 13 Renée (Dickinson) Butler, MS, DABR Medical Physicist University of Washington Medical Center Department of Radiology Diagnostic Physics Section
Radiation Protection and Fluoroscopy/IR Leaded glasses: Recommended that all full-time radiology interventionists and anesthesiologists should wear leaded eye protection Measured lens entrance dose is ~2.5 +/- 2.0 µSv (radiologist); therefore ~30,000 procedures to reach current 150 mSv/year limit (based on current NRC Dose Limits) NEW!! The ICRP recently released a statement stating lower dose thresholds for cataracts were appropriate. The previous ICRP threshold (and current NCRP – or US – threshold) of 4 Gy (acute exposure) and 8 Gy (chronic exposure) Reduced to 0.5 Gy for acute and chronic exposures, based on recent studies of patients and occupational workers. Note, even though the USA has yet to adopt this ICRP threshold, it is anticipated change. Because of this lower cataract threshold, the ICRP slashed the occupational dose limit for the lens of the eye to 20 mSv in a year, averaged over a defined period of five years. The cumulative lens dose should not exceed 50 mSv in any single year.