血管撮影装置の線量調査

概要

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In angiographic systems, interventional radiology(IVR) results in a relatively high radiation dose to the patient and staff due to the extended fluoroscopy time and number of images acquired during an examination. In this study, entrance exposure dose to I.I. and entrance surface exposure dose were measured in 18 angiographic systems at 15 hospitals. The average entrance exposure dose was 1.77 μC/kg/min(1.10-3.38) with the continuous fluoroscopic mode, 2.02 μC/kg/min(1.10-4.02) with the pulsed fluoroscopic mode(30pulse/sec), 1.06 μC/kg/min(0.66-2.11) with the pulsed fluoroscopic mode(15 pulse/sec), 7.96 nC/kg/frame(4.26-16.8) with the cine and DA simultaneous acquisition, and 6.40 nC/kg/frame(3.12-12.5) with the DA acquisition. The average entrance surface exposure dose was 0.86 mC/kg/min(0.52-1.47) with the continuous fluoroscopic mode, 0.99 mC/kg/min(0.57-1.40) with the pulsed fluoroscopic mode(30 pulse/sec), 0.51mC/kg/min(0.29-0.72) with the pulsed fluoroscopic mode(15 pulse/sec), 5.74μC/kg/frame (2.19-9.80) with the cine and DA simultaneous acquisition, and 4.64 μC/kg/frame (1.60-7.48) with the DA acquisition. the x-ray tubes, additional dose reduction filters and x-ray grids obviously influenced the results of entrance surface exposure dose.
1998-05-20