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KMID : 0364920000250040191
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Journal of Radiation Protection and Research
2000 Volume.25 No. 4 p.191 ~ p.195
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Radiation Exposure of Operator in Intracoronary Radiotherapy Using ^(188)Re
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Chie, Eui Kyu/지의규
Lee, Myung-Mook/Wu, Hong-Gyun/이명묵/우홍균
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Abstract
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This study was undertaken to estimate the exposed dose
during .the intracoronary radiotherapy procedure as a part of ongoing
University Hospital Post-Angioplaty Rhenium) trial. Data of thirty-four
irradiated patients participating in this trial due to coronary artery stenosis were retrospecuvely analyzed. Intracoronary radiotherapy was delivered to the patient immediately after angioplasty ballooning. Prescribed dose was 17 Gy to media of the diseased artery and was delivered with ^(188)Re filled balloon catheter. Dosimetry was carried out with GM counter at eight different points. Ten centimeter and forty centimeter from the patient´s heart were selected to represent maximum and whole-body exposed dose of the operator, respectively. Median delivered dose was 111.5 mCi with average treatmemt time of 576 seconds. Average exposed dose rate at 10 cm and 40 cm from the patient´s heart were 0.43 mSv/hr and 0.30 mSv/hr, respectively. Average exposed doses per treatment were 0.07 mSv and 0.05 mSv for 10 cm and 40 cm from the patient´s heart, respectively. Exposed dose measured are much lower than recommended limit of 50 mSv for radiation workers or 1 mSv for general population in ICRP-60. This study proves that current method of intracoronany radiotherapy incorporated in this trial is very safe regarding radiation protection.
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