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題名:電子射束遮擋照野劑量輸出之研究     (12點)
A Study on the Dosimetry of Irregular Electron Fields
著者:黃英明(Ing-Ming Hwang) ;陳海雯(Helen H. W. Chen) ;郭珍妮(Jenny Que) ;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:電子射束 ; 小照野劑量輸出 ; 劑量計算 ; Electron beam ; Cutout field output ; Dosimetry
刊名:放射治療與腫瘤學
頁碼:193-198
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

目的: 電子射束不規則形遮擋照野的劑量輸出尚無法以任何數學公式予以正確預估及計算, 本篇針對V a r i a n CL- 1800 sn: 1 6 4 直線加速器各電子限光筒, 各自E童電子射來分別測量由全闖到I x I em '正方形照野的輸出, 觀察其輸出與遮擋面積之變化關f系, 進而建設臨床電子射束不規則形照野劑量之修正方法. 扭扭盟主達: 採用C E R R O B E N D 鉛合金製作面積不間,鈍圖為I x I em '至lO X 10 e rr戶, ste p size =I e m 及1 5 x 15 e m '之正方形遮擋鉛塊, 置於V a r i a n CL- 1800 sn: 164 之限光筒底部, 以N . E . 0.03 e.e.平板型游離腔( T y pe : 2 5 34 ) 置於RM I P M M A 固態假體射束中心軸最高劑量點深度﹒ 對2 0 x 20 er咐,15 x 15 em' , l OX 10 em '及6 x 6 em '電子限光筒及能量為4 , 6, 9. 12. 15 M eV 的電子射束測量其輸出,並將其數值歸一到全閱fl!l野的輸出,以觀察電子射線在同一限光筒中,因照野縮小後其劑量的變化情形;並以數塊臨床病患之鉛塊經測量及計算互相比對其誤差。 結果: 20 x 2 0 及15 x 15 em '的眼光筒﹒ 對各有E 量而言. fl!l 野面積小於5 x 5 em '以下時輸出明顯降低; lO X 10 er川的限光筒' fl!l野面積小於4 x 4 e m '以下; 6 x6 e m ' 的限光筒, 照野面積小於3 x3 em'以下繪出亦明顯降低,若遮擋fl!l野不小於以上數值則其繪出不必特別l修正。 結論: 不規則形fl!l 野電子射束劑量輸出的變化無法姐光子射束一般可用SA R 值及C l a r kso n ;去予以精確計算﹒ 由本質隘的結果可知:若遮擋面績不超過劑量衰,成點則其繪出不必特別l修正; 若遮擋面領超過劑量衰減點則可用M D M ill s 所提出的方法進行劑量計算。
Purpose: Computer summation algorithms for ir regular electron fields are not widely available. In this study, we measured the output factors of each electron energy and each electron cone (except 25x 25 ern" applica tor) of Varian CI-1800 sn: 164 linea r accelerat or. The cut-out size is ranging from 1x 1 ern" to 10x 10 ern" stepped by 1 cm for 10x 10 ern" and 6 x 6 ern" electron cones and 15 x 15 ern" for 20x 20 ern" cone. According to the measured dat a , we will observed the variation of the outp ut factors and sugges t the meth od for irregular electron field output correct ion. Ma teria ls & Methods: Cut-out BSBs (Beam-Shap ing-Block s) were made of CERROBEND alloy to put into the frame of eac h applica tor. The output was measur ed with 0,03cc para llel plate ionization chamber be setted at the dmax of RMI PMMA solid phantom and connected to Ionex Dosemaster 2590 electro mete r. The readings were corrected with temperature, pressure and be normalized to its full open cone output. Results : For each energy and 15 x 15 ern", 20x 20 ern" electron cones, the output fact ors decreases rapidly when the cut-out size is less than 5 x 5 ern", For 10 x 10 ern" cone, the output is not decrease when the cut-out size is larger than 4 x 4 cm", For 6x 6 cm" cone, the output is the same when the cut-out size is not less than 3 x 3 cm", Concl usion : T here is no simple mathematical functi on just like the SAR meth od and Clarkson mehtod that a llows us to predict the output for a given field size and elect ron energy. According to the results of this measur ement , the output of the irregular field ca n be corr ect ed by Mills method if the cutout area less than the point of curve decr easing.


    

本卷期目次
放射治療與腫瘤學
不對稱準直儀在放射治療技術上之運用/ 劉明祥梁雲呂宗憲康暐篁吳嘉明
電子射束遮擋照野劑量輸出之研究/ 黃英明陳海雯郭珍妮王裕文
鼻咽癌病人使用一日兩次多分次照射之急慢性副作用分析/ 任益民許文林吳錦榕蘇志中熊佩韋張立平張東浩
EB病毒與促癌物協同作用能誘發裸鼠體內人的鼻咽癌/ 曾毅劉振聲滕智平李寶民蘇玲紀志武劉彥仿
The Use Factor for Protective Barrier in a Medical Linear Accelerator Installation/ Pao-Shu ChangChih-Jen HuangShi-Long LianYu-Hui Ho
組織間挿植熱治療使用熱透導管系統之研究/ 顏上惠江俊霖趙良曉李玉麟季匡華王曼肇陳光耀
維生素C對於KB及CHO細胞放射線敏感度之影響/ 許文林黃經民
腔內射頻熱治療時假體內溫度分佈之研究/ 熊佩韋許文林蘇振隆張玉鈴蘇志中施榕平
Dual Involvement and Its Potential Significance of Epstein-Barr Virus and Human T Lymphotropic Virus Type I in Nasopharyngeal Carcinoma/ Koshi MaruyamaMotohiro MiyauchiShigenobu MochizukiNobuko KoshikawaKiyoko Kawamura
A Brief Report of Forty-Fourth Annual Meeting of the Radiation Research Society/ Ji-Hong HongSimon G. Tang
EB病毒與促癌物協同作用能誘發裸鼠體內人的鼻咽癌/ 曾毅劉振聲滕智平李寶民蘇玲紀志武劉彥仿
Dual Involvement and Its Potential Significance of Epstein-Barr Virus and Human T Lymphotropic Virus Type I in Nasopharyngeal Carcinoma/ Koshi MaruyamaMotohiro MiyauchiShigenobu MochizukiNobuko KoshikawaKiyoko Kawamura
鼻咽癌病人使用一日兩次多分次照射之急慢性副作用分析/ 任益民許文林吳錦榕蘇志中熊佩韋張立平張東浩
維生素C對於KB及CHO細胞放射線敏感度之影響/ 許文林黃經民
組織間插植熱治療使用熱透導管系統之研究/ 顏上惠江俊霖趙良曉李玉麟季匡華王曼肇陳光耀
腔內射頻熱治療時假體內溫度分佈之研究/ 熊佩韋許文林蘇振隆張玉鈴蘇志中施榕平
電子射束遮擋照野劑量輸出之研究/ 黃英明陳海雯郭珍妮王裕文
不對稱準直儀在放射治療技術上之運用/ 劉明祥梁雲呂宗憲康暐篁吳嘉明
The Use Factor for Protective Barrier in a Medical Linear Accelerator Installation/ Pao-Shu ChangChih-Jen HuangShi-Long LianYu-Hui Ho
A Brief Report of Forty-Fourth Annual Meeting of the Radiation Research Society/ Ji-Hong HongSimon G. Tang
 
   
 
   

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