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1
題名:動態式楔形濾板穿透因子之測量     (8點)
A Measurement on the Transmission Factors of Dynamic Wedges
著者:黃英明(Ing-Ming Hwang) ;郭珍妮(Jenny Que) ;陳海雯(Helen H. W. Chen) ;王裕文(Yu-Wen Wang)
出版地區:台灣
出版城市:台北市
學科:醫學綜合
關鍵字:放射治療 ; 動態式楔形濾板 ; 穿透因子 ; 劑量學 ; Radiation therapy ; Dynamic wedge filter ; Transmission factor
刊名:放射治療與腫瘤學
頁碼:45-48
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

目的: 本編主要;J!IJ . Varian CL♂100C/D sn : “ | 動態式模形濾板在不同照野的穿透因子, 以做為建立臨床動態it模形濃板齊IJ .學資料之一頸,並與固定式模形i慮板因子做比較,以了解動態式模形濾板劑量上不同於固定式模形濾板的特性,增加對動態式模形濤、被劑11.學上的了解及使用上應考量的因索。 聲墊盟主畫: 以N . E . 0.6 ee Farmer Type 游離腔置於Seand itron ix RFA-300 水假體射束中心軸深度5em (6 MV ) 及10 em (15 MV ) 處﹒ 將水假體表面置於100 em 處, 游離股長軸與濾板橫切面呈垂直,分別測量I S '、3 0 '、4 5 ' 、6 0'固定式及動態式俱形濾板各正方形照野之穿透圈子﹒ 以觀察並比較其變化。 草~:固定式模形濾坡之穿透因子隨照野變大有增大之畫畫勢﹒平均約增加3 % ;動態式模形証書板穿透因子一般較固定丈模形i慮板之穿透因子大﹒ 與照野大小之變化關係則呈不規則之變小趨勢,相差最大達3 5%. 結詣:動態式模形濾板在國內應用之經驗尚邊,對其劑量學上之特性應予多方了解﹒比如等劑量分佈曲線'51!透因子與照野之閥係等﹒ 由本文之結果得知動態式模形濾被穿透因子與照野之關係不是規則性變化,對國床應用上﹒由於變化極大﹒劑量計算時踏車見其照野大小正確查得其因子,以求得正確之監;J!IJ單位;另外, 欲對一般電腦治療計畫系統建立動盟員式模形昌禮板資料庫時,亦應對穿透因子的不規則變化仔細考慮其劑量學的準確性。
Purpose: The transmission factors of each dynamic and fixed wedge were measured for Varian CL-2100C/D sn: 481 linear accelerator. The factors were used to set-up the clin ica l treatment data tables for clinical dosimetry for dynamic wedges utilization. The data will be used to set -up the computer treatment planning database also . Ma terials and Methods : The N.E. 0.6 cc Farmer type chamber (Type: 2571) con nected to Ionex Dosemaster 2590 was installed on the chamber frame of Scanditronix RFA-300 water phantom with water prove protector. The axis of the chamber is perpendicular to the transverse plane of the wedge. Output factors in water wer e measured on the central axis of each field at 5-cm depth for 6 MV and lO-cm depth for 15 MV X-ra ys. The phantom was positioned with the water surface at 100 cm SSD. Measurements wer e performed for field sizes ranging from 4.0-20.0 cm and for equivalent square field to 25 cm. The measurements were performed for open, for fixe d and dynamic wedge angles. The transmission factor of each field size was calculated from the outp ut wit h/without wedge. Results : The transmission factors of each fixed wedges were increased as field size increase. Th e increment is around 3%. The factors of the dynamic wedge were larger than the fix ones , but the factors were decreased irregularly when field size increase. The maximum decrement is 35%. Conclusion : Transmission factor is an important parameter in clinical applications of wedge filte rs. The variation of the factors of dynamic wedges verse field size is not the same as fixe d ones and more complex. Due to the variation of the factors, one should take more attent ion in the applica tio n and the data input of the planning system.


    

本卷期目次
放射治療與腫瘤學
動態式楔形濾板穿透因子之測量/ 黃英明郭珍妮陳海雯王裕文
Estimation of Complication Probability for Non-Uniform Normal Tissue Irradiation Using the Effective Volume Method and Normal Distribution/ Mu-Tai LiuChi-Yuan YehJao-Perng LiuShing-Sheng HuangChung-Chi LeeYu-Ming LiuKuang-Y. Chen
晚期子宮內膜癌/ 吳孟浩張國華賴允亮王銘志
Evaluation of Major Salivary Gland Function by Sialoscintigraphy in Nasopharyngeal Carcinoma Patients Receiving Radiotherapy/ Ping-Kun WengShyh-Ing GuanYee-Min Jen
Treatment Results of Hodgkin's Disease from 1977 to 1991 in National Taiwan University Hospital/ Louis Tak LuiChih-Chiech HsuNa-Na ChungPo-Ming WangChao-Yuan HuangLai-Lei Ting
早期子宮內膜癌的治療與預後因子/ 王銘志吳孟浩張國華賴允亮鍾昌宏劉岱瑋陳裕仁
放射手術與多照野放射治療早期復發性鼻咽癌之臨床病例報告/ 白冰清曾雁明劉千如李石增湯國政
第四期鼻咽癌的預後因子/ 劉文山張慶雄胡渝昌陳建勳吳永平陳光耀
Aggressive Combined Moddality in Inflammatory Breast Carcinoma with Minimal Distant Metastasis-A Case Report/ Robert TanAndrew YoungChing-Tang Wu
Treatment Results of Oral Tongue Cancer/ Chao-Yuan HuangLouis Tak LuiPo-Ming WangNa-Na ChungLai-Lei Ting
全球資訊網(World Wide Web)上的放射治療Home Page:一年來的經驗與未來的展望/ 熊敬業梁雲陳翰森王重榮陳惠君孫立民方富民
第四期鼻咽癌的預後因子/ 劉文山張慶雄胡渝昌陳建勳吳永平陳光耀
早期子宮內膜癌的治療與預後因子/ 王銘志吳孟浩張國華賴允亮鍾昌宏劉岱瑋陳裕仁
Treatment Results of Oral Tongue Cancer/ Chao-Yuan HuangLouis Tak LuiPo-Ming WangNa-Na ChungLai-Lei Ting
Treatment Results of Hodgkin's Disease from 1977 to 1991 in National Taiwan University Hospital/ Louis Tak LuiChih-Chiech HsuPo-Ming WangNa-Na ChungChao-Yuan HuangLai-Lei Ting
Estimation of Complication Probability for Non-Uniform Normal Tissue Irradiation Using the Effective Volume Method and Normal Distribution/ Mu-Tai LiuChi-Yuan YehJao-Perng LinShing-Sheng HuangChung-Chi LeeYu-Ming LiuKuang Y. Chen
動態式楔形濾板穿透因子之測量/ 黃英明郭珍妮陳海雯王裕文
晚期子宮內膜癌/ 吳孟浩張國華賴允亮王銘志
Evaluation of Major Salivary Gland Function by Sialoscintigraphy in Nasopharyngeal Carcinoma Patients Receiving Radiotherapy/ Ping-Kun WengShyh-Ing GuanYee-Min Jen
放射手術與多照野放射治療早期復發性鼻咽癌之臨床病例報告/ 白冰清曾雁明劉千如李石增湯國政
Aggressive Combined Modality in Inflammatory Breast Carcinoma with Minimal Distant Metastasis-A Case Report/ Robert TanAndrew YoungChing-Tang Wu
全球資訊網(World Wide Web)上的放射治療Home Page:一年來的經驗與未來的展望/ 熊敬業梁雲陳翰森王重榮陳惠君孫立民方富民
 
   
 
   

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