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| 題 名 | 利用熱發光劑量計比較多切面電腦斷層攝影於不同參數下腹部檢查之有效劑量影響=Comparison of Effective Doses under Various Scanning Parameters in Multi-Slice Computed Tomography Abdomen Examination Using TLD |
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| 作 者 | 聶伊辛; 陳宜壎; 洪瑞助; 呂坤木; 陳良光; | 書刊名 | 臺灣應用輻射與同位素雜誌 |
| 卷 期 | 9:2 2013.06[民102.06] |
| 頁 次 | 頁619-625 |
| 分類號 | 414.93 |
| 關鍵詞 | 多切面電腦斷層; 熱發光劑量計; 有效劑量; 空間解析度; Multi-slice computed Tomography; TLD; Effective doses; Spatial resolution; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究係比較同一廠牌Philips Brilliance之64-MSCT與256-MSCT在進行病人全腹部掃瞄檢查時,改變CT的操作參數,包括改變pitch、tube voltage(kV)與effective mAs等參數,在不影響診斷要求的解析度條件下,評估受檢者的有效劑量(effective doses)。輻射劑量之度量係利用兩種熱發光劑量計(thermoluminescent dosimeters, TLDs)GR-200F與GR-200(LiF: Mg, Cu, P)分別置於Rando phantom外表與內部度量皮膚與器官劑量輻射加權因數(radiation weighting factors, WR)與組織加權因數(tissue weighting factor, WT),係參照國際放射防護委員會第60號報告,本研究探討在臨床CT的例行條件(routine protocol)檢查之外,是否有其他可行的作業條件又能降低病人的有效劑量。結果顯示臨床例行條件檢查全腹部有效劑量,64-MSCT與256-MSCT scanners分別為19.56 mSv 與25.2 mSv,256-MSCT 比64-MSCT高22 %。結論來說,改變pitch、effective mAs及tube voltage(kV),256-MSCT機器的有效劑量均大於64-MSCT者。利用ACR CT accreditation phantom分析不同掃描條件的影像(image)空間解析度(spatial resolution),結果都可得到5 lp/cm以上的解析能力capability,符合診斷的需求。 |
| 英文摘要 | This study aims to compare the effect of Philips Brilliance's 64-MSCT and Philips Brilliance's 256-MSCT on effective doses when changing the operating parameters in the scan examination of patients' whole body or whole abdomen, including the changes in detector rows, pitch, tube voltage (kV) effective tube current (mAs) and other parameters. This is to assess the effective doses when the resolution requirement in the diagnosis will not be affected. The radiation doses are determined by placing two kinds of thermoluminescent dosimeters (TLDs), GR-200F and GR-200 (LiF: Mg, Cu, P), on the surface and inside the Rando phantom.The purpose of the study is aims to investigate the possibility of using other probable operating conditions to reduce patients’ effective doses, in addition to the routine protocol examination of clinical CT. The results show that the regard to effective doses of the whole abdomen examined by clinical routine protocol, 64-MSCT and 256-MSCT scanners are 19.56 mSv and 25.2 mSv respectively, and the effective dose of 256-MSCT is higher than 64-MSCT by 22 %. When we change the pitch, effective mAs and tube voltage (kV), the effective doses of 256-MSCT exceed those of 64-MSCT. Finally, the image spatial resolution is evaluated by the ACR CT accreditation phantom. The resolution of over 5 lp / cm meets the diagnostic requirement. |
本系統中英文摘要資訊取自各篇刊載內容。