頁籤選單縮合
題 名 | 三度空間電腦放射治療計畫系統之驗收與測試=3-D Radiotherapy Treatment Planning System Acceptance Test |
---|---|
作 者 | 林盈釧; 吳簡坤; 黃英強; 簡哲民; | 書刊名 | 放射治療與腫瘤學 |
卷 期 | 5:4 1998.12[民87.12] |
頁 次 | 頁303-310 |
分類號 | 416.36 |
關鍵詞 | 三度空間電腦放射治療計畫系統; 驗收過程; 射束資料; 臨床應用; 3-D RTP; ATP; Beam data; Clinical application; |
語 文 | 中文(Chinese) |
中文摘要 | 目的:如何使三度空間電腦放射治療計劃系統(3-D Radiotherapy Treatment Planning System, 3-D RTP) 計算所得之等劑量曲線分佈與水假體量測出來之結果取得合理 的一致性, 是 RTP 驗收過程 (Acceptance Test Procedure, ATP) 中重要的課題,也是病 人接受高品質放射線治療的重要因素。 材料與方法: 本文係針對 Computerized Medical System-Focus 1.4.0 及 Helax--TMS 4.0 版系統逐項作一驗收測試, 並且評估其間之誤差 值是否合理以及運用於臨床上之治療是否可行。ATP 分成硬體及軟体兩部份,硬體包括網路 之連結及影像之傳輸功能,屬於 3-D RTP 本身數位板 (digitizer) 的準確性,繪圖機的放 大率及準確度及病人資料保存 (backup) 之完整性與方便性。軟體部份有光子及電子射束的 百分深度劑量 (Percentage Depth Dose)、等劑量曲線分佈 (isodose distribution) 及射 束剖面圖 (beam profile) 的比對; 以及針對光子射束的開放性照野 (open-field)、楔形 濾板 (wedge)、 組織填充物 (bolus)、 非均勻密度組織 (inhomogeneities)、 鉛擋塊 (block) 及多葉型準直儀 (Multi-Leaf Collimator, MLC) 修正後的劑量比對;另外電子的 斜角度劑量分佈 (oblique incidence) 也是驗收項目。 由於治療計畫是以電腦斷層影像為 基礎,因此院內放射治療網路系統 (SIEMENS LANTIS) 之連結及影像傳輸系統之設施亦需針 對其特點逐一驗收測試,以利於整體之應用操作。 結果:以 Helax-TMS 而言,開放性照野 部份, 若照野大於 20 × 20 則觭角效應 (horn effect) 會明顯增大,最大約 2% 的劑量 誤差。而鍥形濾板部份照野不宜過大,若照野大於 10 × 10 則 45 °及 60 °楔形濾板會 有約 3% 之劑量誤差。 鉛擋塊及多葉型準直儀的半影區則較水假体所量測之值有大約 2 ∼ 3 mm 之誤差。對 CMS-Focus 而言,在開放性照野部份,觭角效應並不會隨照野之大小而有 所改變,其劑量誤差值有 2%。楔形濾板之劑量誤差值約在 2%,照野適用範圍可開至最大值 20cm。 而鉛擋塊及多葉型準直儀之半影區則有 1 ∼ 2 mm 之誤差。討論:對於以上驗收測 試的結果,網路之連結及影像之傳輸皆可正常之運作,而劑量分佈之誤差值皆在放射線治療 可接受的範圍內,因此也確定本院兩套 3-D RTP 可應用於臨床放射線之治療。 |
英文摘要 | Purpose:The important subject of 3-D radiotherapy treatment planning system (3-D RTP) acceptance test procedure (ATP) is to get the reasonable agreement between the calculated isodose distribution of 3-D RTP and the measured results of water phantom, before the clinical use of 3-D RTP system. Materials & Methods:This report is a acceptance test results of Computerized Medical System--Focus 1.4.0 and Helax--TMS 4.0. Acceptance test procedure includes hardware and software. Hardware includes the function of the link of Network system, the function of the image transfer system. the accuracy of the digitizer, the magnification and accuracy of the plotter, athe function of the printer and the patient data backup facility. Software includes the comparison of percentage depth dose for photon beam and for electron beam, isodose distribution check and beam profile check. The comparisons of photon beam include open-field, wedge-field, half-beam, asymmetric jaws, irregular-field, bolus, inhomogeneities, block-field and Multi-Leaf Collimator MLC). The electron oblique incidence is also one of the test items. Results:For Helax--TMS, if the field size is more than 20 × 20, the open-field horn effect will be increased, the maximum dose deviation about 2%. It's about 3% dose deviation of 45 ° and 60 ° wedge filter of the field size more than 10 × 10. The penumbra error of block and MLC is 2-3 mm compared with water phantom data. For CMS-Focus, the horn effect is independent of field size and the dose deviation about 2%. The field size of wedge filter can open to a maximum of 20 cm and the dose deviation is 2%. The penumbra error of block and MLC, compared to water phantom, about 1-2 mm. Conclusion: In conclusion, the functions of network and include image-transfer are acceptable and the isodose distribution discrepancies are also acceptable for the clinical radiotherapy treatment application. |
本系統中英文摘要資訊取自各篇刊載內容。