Program Information
A Method to Create Standard Scatter-Mimicking Primary Beams (SMPB) for Measuring the Diagnostic Radiological Index of Protection (DRIP)
A Jones1*, A Pasciak2 , S Balter3 , L Wagner4 , (1) MD Anderson Cancer Center, Houston, TX, (2) University of Tennessee Medical Center, Baltimore, MD, (3) Columbia University Medical Center, New York, NY, (4) UT Medical School, Houston, TX
Presentations
SU-F-702-6 (Sunday, July 30, 2017) 2:05 PM - 3:00 PM Room: 702
Purpose: To further develop the Diagnostic Radiological Index of Protection (DRIP) by defining standard scatter-mimicking primary beams (SMPB) based on beam quality data from Radiation Dose Structured Reports (RDSR).
Methods: It has been demonstrated that the DRIP is most sensitive to primary beam quality, in particular kV. Primary beam quality varies substantially among different fluoroscopically-guided procedures. Beam quality data for over 150,000 exposure events in interventional radiology (IR) over a year period for multiple fluoroscopes at multiple sites were collected. The data was binned in 5 keV bins and weighted by contribution to kerma area product (KAP) to identify the top five beam qualities that contributed to operator exposure in each area and the associated weighting of each beam quality.
Results: Primary beam qualities differed by both equipment type and clinical area. When all data was considered in aggregate, acquisition (ACQ) beams with kV ranging from 79 to 88 and added filtration ranging from none to 1.0 mm aluminum contributed a total of 82% and a single fluoroscopy (FLU) beam (69 kV, 0.2 mm Cu) contributed 12%. The data for single sites was substantially different, with kV for the top five beams ranging from 72-87 at one site and 65 to 120 at another site. These beams can be translated to SMPB using established methods.
Conclusion: While it is desirable to have a single set of five beam qualities for evaluating protective garments, the range of kV used varies substantially among sites. Evaluation of the impact of these differences on the DRIP is required.
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