(Tuesday, 7/16/2019) 9:30 AM - 10:00 AM
Room: Exhibit Hall | Forum 8
Purpose: Primary and secondary angles of the X-ray tube during interventional procedures have significant impact on the occupational dose to operators. This study aims to assess the KAP-weighted distribution of primary and secondary angles for interventional studies at our institution.
Methods: Data of kerma-area-product (KAP), primary angle and secondary angle per acquisition were retrieved for two cardiac procedure rooms and four non-cardiac procedure rooms during the six-month period between Aug 26th, 2018 and Feb 26th, 2019. The angles were grouped into 5-degree bins centered at 0°, ±5°, ±10°, etc. and analyzed.
Results: A total of 2198 procedures consisting of 162680 acquisitions were obtained from the non-cardiac rooms, and 887 procedures consisting of 49585 acquisitions were obtained from the cardiac rooms. While the average KAP per procedure is comparable between cardiac and non-cardiac procedures (74.1 Gy·cm² vs 63.6 Gy·cm²), the angular dose profiles are significantly different. For non-cardiac procedures, 90% of the KAP is delivered with secondary angle between -2.5° and 2.5°, and 98% KAP delivered between -7.5° and 7.5°. The dose profile along the primary angle can be grouped into four clusters centered at -100°, -25°, 0° and 25°, with 5%, 18%, 56% and 21% of the KAP delivered for each group, respectively. For cardiac, 37% of the KAP is delivered with secondary angle between -2.5° and 2.5°, and 53% between -7.5° and 7.5°. The angular dose profile of cardiac procedures can be grouped into seven clusters centered at (-25°, -25°), (-30°, 0°), (-15°, 30°), (0°, 0°), (35°, -25°), (30°, 0°) and (25°, 25°), with KAP weighted at 9%, 8%, 15%, 23%, 9%, 27% and 9%, respectively.
Conclusion: The angular dose profile for cardiac interventional procedures is significantly different from that of non-cardiac procedures. This difference should be factored in during the estimation of occupational doses for interventional radiologists.
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