Document Type : Original Paper
Department of Medical Physics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Department of Radiology, Faculty of Paramedicine, Hamadan University of Medical Sciences, Hamadan, Iran.
Department of Radiology, Faculty of Paramedicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran Molecular Medicine Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
Department of Basic Sciences, School of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Nuclear Science Research School, Science Research School, Nuclear Science & Technology Research Institute (NSTRI), Atomic Energy Organization of Iran, Tehran, Iran
Introduction: This study aimed to investigate the absorbed dose of scatter radiation in coronary angiography.
Material and Methods: The scatter radiation dose was measured for 20 patients at four different heights (50,100, 150, and 165 cm) from the floor. The spatial dose was measured by RTI Piranha r100b solid-state dose probe at different points around the patient in an actual clinical situation and with a phantom. Also, the measurement was repeated using a designed phantom in fluoroscopy and cine mode in posterior anterior (PA), left lateral (LLAT), left posterior oblique (LPO45°), right posterior oblique (RPO45°), and right-lateral (RLAT)projections . Organ-absorbed doses were normalized to dose area product (DAP).
Results: The dose rate at different heights between the projections on the patient and the phantom as well as organ dose DAP conversion coefficients were different (p˂0.05). It was found that the dose rate changes in fluoroscopic mode compared to cine mode are significantly different (p = 0.001). The dose rate in cine mode is approximately four times that in fluoroscopy mode. The dose rate around the cardiologist's waist could be reduced by 37 – 43 % with a displacement of 20cm away. In this study, the effective dose rate received by the cardiologist’s eyes was higher than those reported by ICRP.
Conclusion: Taking a suitable projection could reduce the dose rate delivered to the angiography team. Further studies should be conducted about the effect of different projections with the same clinical use on dose distribution in coronary angiography to provide the best working conditions for physicians and staff.