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Reduction of Radiation Dose according to Geometric Parameters from Digital Coronary Angiography

디지털 심혈관조영장치의 기하학적 특성에 따른 선량 감소

  • Kang, Yeonghan (Department of Radiology, Daegu Catholic University Hospital) ;
  • Cho, PyongKon (Department. of Radiological Science, Catholic University of Daegu)
  • 강영한 (대구가톨릭대학교병원 영상의학과) ;
  • 조평곤 (대구가톨릭대학교 방사선학과)
  • Received : 2013.07.04
  • Accepted : 2013.08.25
  • Published : 2013.08.31

Abstract

This study aims to find out geometric parameters which practitioner adjustable to reduce dose in coronary angiography. We take fluoroscopy and cine exposure by use of phantom, and got dose use the dose-area product(DAP) meter of angiography device, than convert DAP to effective dose. As results, Cine exposure shows higher dose measurement about 6-7 times than fluoroscopy. Dose in frame per second(FPS) mode could be decrease down to 70%, as lower FPS. In view of X-ray tube angle, LAO $45^{\circ}$+Caudal $30^{\circ}$ shows highest dose measurement. More use of Collimator, lower dose measurement. Source-image intensifier distance(SID) get longer to 10cm, dose of each fluoroscopy and cine exposure increase up to 25-30%. Image magnification of field of view(FOV) could increase dose up to 1.21-2 times. Also table-image intensifier distance get longer to 10cm, dose increased 1.11-1.25 times. Practitioner can adjust several geometric parameters, as FPS mode, tube angle, Collimation, SID, table-image intensifier distance, FOV. And each factors can reduce radiation dose in coronary angiography.

Keywords

Digital coronary angiography;Fluoroscopy;Cine exposure;Dose reduction

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