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題名 | The Study of the Clinical Dose Distribution for Dynamic Virtual Wedge Algorithm=動態虛擬式楔形濾器之劑量分佈探討 |
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作者 | 林招膨; 張東浩; 王愛義; 劉幕台; 陳苑蓉; 郭瓊文; 賴源淳; Lin, Jao-perng; Chang, Tung-hao; Wang, Ai-yih; Liu, Mu-tai; Chen, Yuan-rong; Kuo, Chiung-wen; Lai, Yuan-chun; |
期刊 | 彰化醫學 |
出版日期 | 20030400 |
卷期 | 8:2 2003.04[民92.04] |
頁次 | 頁87-97 |
分類號 | 415.12 |
語文 | eng |
關鍵詞 | 動態虛擬式楔形濾器; 楔形濾器穿透因子; 動態虛擬式楔形濾器角度; Virtual wedge; Wedge factor; Virtual wedge angle; |
中文摘要 | 背景與目的:本研究針對動態虛擬式楔形濾器的臨床特性,包括動態虛擬式楔形濾器角度驗證,楔形濾器穿透因子,百分深度劑量,與劑量分佈剖視圖各項做探討。 方法:使用Wellhofer IC15游離腔與CU500E 6177電子劑量計於48×48×40 cm3水假體中量測角度,穿透因子,百分深度劑量等各項因子。並利用CA24陣列式游離腔,量測劑量分析剖視圖。動態式楔形濾器以直線加速器機頭控制上準直儀等速度移動及劑量率的變化,達成所想要的實體楔形濾器角度的劑量分佈剖視圖。動態虛擬式楔形濾器劑量分佈物理特性包括了在不同深度與照野下虛擬角度的驗證,實體與動態虛擬式楔形濾器百分深度劑量與楔形濾器穿透因子及剖視圖的區別。 結果:動態虛擬式楔形濾器設定角度與機器實際角度誤差1°內。所有動態虛擬式楔形濾器穿透因子均近1.0,誤差在1%以內。而60°楔形濾器其照野在20×20 到 24×24 cm2,其誤差約為2-3%。動態虛擬式楔形濾器之百分深度劑量較接近開放照野之百分深度劑量。 結論:不管是臨床上或劑量學上,動態虛擬式楔形濾器在放射治療計畫中均較實體楔形濾器更具實用性。在臨床實務的應用上,更方便作為治療的設定,可有更多角度的選擇性。本文具體討論了這些臨床劑量分佈的特性及其臨床應用。隨之,動態虛擬式楔形濾器每日每月的品質保證課程更增進了其在治療計畫中的品質。 |
英文摘要 | Background and purpose: This study describes our experience in clinical application of the virtual wedge (VW), including VW angles verification, wedge factors, percentage depth doses and profiles. Methods: We used a Wellhofer IC15 0.13cm3 ion chamber, a CU500E 6177 electrometer, and a 48×48×40 cm3 water phantom. An ion chamber array detector (CA24, Wellhofer Dosimetrie) was employed to measure the profiles. Simultaneously controlling the movement of one of the upper collimator jaws and varying the dose rate during irradiation created the virtual wedge. This procedure produced a dosc profile comparable to that achieved from a physical wedge (PW). Results: The measured wedge angles were consistent with the machine setup angles to within 1°. All wedge factors of the VW were equal to 1.0 within 1%, except for 60° wedges for 20×20 to 24×24 cm2 field sizes where they deviated by 2-3%. The percentage depth doses (PDD) of VW were closer to those of an open field. Conclusion: VWs are more flexible than PWs, and they have practical and dosimetric advantages. VWs are more convenient for treatment setup, and they have various arbitrary angles. VWs are a positive positive replacement for PWs. (Changhua J Med 2003;8:87-97) |
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