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題 名 | 磁振造影技術驗證動態三維NIPAM凝膠劑量計的可行性評估=The Feasibility Assessment of Radiation Dose of Movement 3D NIPAM Gel by Magnetic Resonance Imaging |
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作 者 | 謝志明; 謝栢滄; 吳汝濱; 鄭智武; 孫榮章; 林秉津; 梁恆; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 38:2 2014.06[民103.06] |
頁 次 | 頁61-68 |
分類號 | 414.93 |
關鍵詞 | 磁振造影; 聚合凝膠劑量計; 器官移動; MRI; NIPAM; Polymer gel dosimeter; Organ motion; |
語 文 | 中文(Chinese) |
中文摘要 | 目前NIPAM(N-isopropylacrylamide)凝膠劑量計由於具有三度空間的分布以及吸收劑量的正確性己漸漸的被接受與推廣,但至目前為止多數的凝膠劑量計研究並沒有考慮器官移動或腫瘤因生理性運動位移所帶來的影響,但在實際臨床實務中有很多的放射線治療必須考慮到器官的生理性運動位移狀況,在本研究裡我們使用新型的NIPAM凝膠劑量計搭配模擬呼吸運動自動控制滑動臺來搭載假體,分別以固定的狀態及模擬人體呼吸的狀態使用直線加速器以劑量1、2、5、8、10 Gy照射並使用MRI為量測的工具,比較兩種條件下的結果,靜態凝膠的敏感度為0.1446 s^(-1)/Gy,R^2為0.999,動態凝膠的敏戚度為0.1337 s^(-1)/Gy,R^2為0.999,兩者間的敏戚度差異約只有8%,線性度則差別不大,此外在劑量率依存性效應以及位置、深度的依存性方面靜態照射及動態照射的結果亦無顯著差異,譚明動態照射並不會改變劑量計的特性,因此我們認為新型NIPAM凝膠劑量計的高敏感度、良好線性度在動態照射下亦不會改變其特性,未來在模擬各種會移動的器官之劑量量測有相當高的發展性。 |
英文摘要 | NIPAM dosimeter is widely accepted and recommended for its 3D distribution and accurancy in dose absorption. Up to the moment, most research on dose measurement are based on a fixed irradiation target without the consideration of the effect from physiological motion. We present a study to construct a respiratory motion simulating patient anatomical and dosimetry model for the study of dosimetic effect of organ motion. The dose on fixed and motion targets were measured by MRl after a dose adminstration of 1, 2, 5, 8, 10 Gy from Linear accelerator. Comparison of two situations. The average sensitivity of fixed NIPAM was 0.1446 s^(-1)/Gy Iinearity R^2 = 0.9993, The average sensitivity of movement NIP AM was 0.1337 s^(-1)/Gy linearity R^2 = 0.999 only 8% of the sensitivity difference. The difference between the two based on dose rate dependency, position and depth were not significant. There was thus no apparent impact on NIPAM dosimeter from physiological motion. The high sensitivity, Iinearity and stability of NIPAM dosimeter prove to be an ideal apparatus in the dose measurement in these circumstances. |
本系統中英文摘要資訊取自各篇刊載內容。