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題 名 | Evaluations of Gonad and Fetal Doses for Diagnostic Radiology=X光診斷之生殖腺及胎兒劑量評估 |
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作 者 | 董傳中; 蔡惠予; | 書刊名 | Proceedings of the National Science Council : Part B, Life Science |
卷 期 | 23:3 1999.07[民88.07] |
頁 次 | 頁107-113 |
分類號 | 418.94 |
關鍵詞 | X光診斷; 生殖腺; 胎兒劑量; Dose; Diagnostic radiology; Gonad; Fetus; Hereditary effect; Health effect; Risk assessment; |
語 文 | 英文(English) |
英文摘要 | A national survey of patient doses for diagnostic radiology was planned in the Republic of China. We performed a pilot study for this survey to develop a protocol of the dose assessments. Entrance skin doses and organ (including ovary, testicle and uterus) doses were measured by thermoluminescent dosimeters and calculated by means of Monte Carlo simulations for several diagnostic procedures. We derived a formula and used the RadComp software for the computation of entrance skin doses. This formula involves several factors, such as kVp, mAs, the focus-to- skin-distance and aluminum filtration. RadComp software was applied to obtain free-air entrance exposures which were converted to entrance skin doses by considering the backscattering radiation from the body. Organ doses were measured using a RANDO phantom and calculated using a mathematical phantom for several diagnostic examinations. Genetically significant doses were calculated from ovary and testicle doses for the evaluation of hereditary effects. Embryo/fetal doses were determined from the uterine doses by considering the increase in uterus size with gestational age. We found that the patient doses studied in this work were all below the reference doses recommended by the National Radiological Protection Board of the U.K. |
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