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研究生:王雱儀
研究生(外文):Pang-I Wang
論文名稱:醫用直線加速器機頭散射輸出因子之計算
論文名稱(外文):A Model for Head Scatter Factor Calculation
指導教授:陳為立徐椿壽
指導教授(外文):Wei-Li ChenChen-Shou Chui
學位類別:碩士
校院名稱:國立陽明大學
系所名稱:放射醫學科學研究所
學門:醫藥衛生學門
學類:醫學技術及檢驗學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:100
中文關鍵詞:機頭散射監測游離腔回散射準直儀位置調換效應蒙地卡羅模擬法
外文關鍵詞:head scattermonitor backscattercollimator exchange effectMonte Carlo simulation
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機頭散射因子之影響,之前已被廣泛地所研究,然而對於強度調控治療(IMRT),其治療照野乃是由許多不規則形狀的小照野所組成,因此機頭散射之影響尤其嚴重。本實驗之目的乃是發展一套程式,可準確且簡單地計算機頭散射因子;不同以往的方式,此程式主要是依據部分的實際測量資料來推出散射射源之分佈強度,並考慮由準直儀所產生之回散射,對於監測游離腔所造成之影響,進而推出各種不同照野之機頭散射因子。目前已完成了Varian 2100C/D、Elekta Precise與Siemens Primus三種醫用直線加速器之量測與計算工作,計算值與實測值的誤差皆小於1%。
The variation of head factor with field shape and size has been studied extensively in the past. For IMRT, this problem is even more important as each field is composed of many irregularly shaped small fields. The purpose of this work was to develop an algorithm to calculate head factors. This model differs from prior methods in that it depends on fewer measured data, and is applicable to any field shape and size. Our model constructs an extended source distribution based on output factors measured at the isocenter. In addition, we explicitly accounts for backscatter into the monitor chamber from the collimating jaws. Using these, we can calculate head factors for different field configurations. The model has been used to calculate output factors from a Varian 2100C/D, a Elekta Precise and a Siemens KD2 Primus accelerator. We found that in general the calculated head factors agreed with the measured values within 1%.
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