孩童與成人假體執行頭部電腦斷層之輻射劑量

評估孩童與成人假體進行頭部電腦斷層之器官等價劑量與有效劑量。估算有效劑量將由ICRU 48 號報告所設計之自製研發數學假體，體重範圍由10 公斤至90 公斤重。全部假體掃描於鹿港基督教醫院飛利浦電腦斷層執行曝露。熱發光劑量計的佈點經由ICRP 103 號報告所設定之組織及器官測得等價劑量。10, 30,70 及90 公斤自研假體之腦部等價劑量分別為46.61±1.83, 48.27±0.47, 54.16±0.06 及 48.98±0.51 毫西弗。這些假體執行頭部電腦斷層的有效劑量範圍為1.91±0.04 至 2.26±0.09 mSv 與1.66 至2.04 mSv 推算於ICRP 103 及 AAPM 96 號報告。DLP 於孩童及成人假體，所推算的有效劑量方式，與熱發光劑量計相比，相差在10.4 %以內。其中，ICRP 103 號報告推算之有效劑量，是根據組織權重，及劑量變化之因素。此外，DLP 對於不同體重之轉換因素，對於有效劑量之計算，是相對可靠且易於使用。最後，我們將結果與其他文獻相比，這發現將提供病患、醫師、放射師及主管機關卓參。

關鍵字

有效劑量；熱發光劑量計；自製研發數學假體； ICRP 103 ； AAPM 96

並列摘要

Effective dose (E) and organ or tissue equivalent dose (HT) of Pediatric and Adult Phantoms undergoing brain CT examinations were evaluated. Polymethylmethacrylate (PMMA) phantoms ranging from 10 to 90 kg derived from ICRU 48 were used to evaluate E herein. All scans were conducted by Philips computer tomography (Brilliance CT) at Lukang Christian Hospital with fixed exposure conditions. Equivalent doses were measured in the organs and tissues of interest via thermoluminescent dosemeter (TLD) approach and recommended by ICRP 103. Equivalent doses of brain for 10, 30, 70, and 90 kg PMMA were 46.6±1.83, 48.3±0.47, 54.2±0.06, and 48.9±0.51 mSv. E of these phantoms ranged from 1.91±0.04 to 2.26±0.09 mSv and 1.66 to 2.04 mSv during CT examinations according to ICRP 103 and AAPM 96, respectively. The DLP calculated effective doses for pediatric and adult were within 10.4% of the TLD calculated effective doses. The effective dose by ICRP 103 definition was primarily calculated based on tissue weighting factors and measured equivalent doses. Besides, the DLP conversion method for different weight is relatively assured for approximating effective dose and easy to use. Finally, experimental results are compared with those in literature. These findings are pertinent to patients, physicians, radiologists, and the public.

並列關鍵字

effective dose (E) ； thermoluminescent dosimeters (TLD) ； PMMA phantoms ； ICRP 103 ； AAPM 96

國際替代計量

孩童與成人假體執行頭部電腦斷層之輻射劑量

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