Conference Paper

Changes in Occupational Radiation Exposures after Incorporation of a Real-time Interventional Suite Dosimetry System.

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Background: Radiation exposures to Interventional Radiology (IR) staff continues to increase as the use of IR increases. To address this, Lawrence General Hospital (LGH) has incorporated the i2 active dosimetry system (RaySafe, Hopkington MA) into their IR department. This system monitors personnel exposures and displays them in real-time on the IR screen during a procedure to provide immediate feed-back on each person’s radiation exposure without removing that person’s focus on the procedure which provides that individual the ability to immediately change their behavior. We present an analysis on the effects of i2 use on personnel radiation exposures at LGH. Methods: Dosimetry records were obtained over an eight month period prior to i2 implementation and over an eight month post i2 implementation. Study participants must have worked during both the pre and post i2 implementation; this group consisted of 3 radiologists, 3 technologists, and 1 nurse. The average dose per procedure was obtained for each participant during the pre i2 period and compared to that obtained over the post i2 period. These results were combined to determine a combined dose per procedure for the department, for the radiologists, and for staff (technologists + nurse). A t-test was used to validate differences in department radiation exposures pre and post i2 while a Wilcoxon Signed Rank test was used to validate dose differences pre and post i2 for the radiologist and technologist groups. Lastly, the percent change in the cumulative dose per procedure was calculated for each participant. Results: A dose reduction of 47% was observed in the IR Department post i2 implementation (p-value of 0.04). Similarly, the dose to the radiologist group was reduced by 53% (p-value of 0.01) and the technologists group by 42% (p-value of 0.03) post i2. Interestingly, all participants were observed to have reduced exposures post i2 that varied between ~15% to ~65%.

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