| 李黎军,宋宏羽,潘洁森,程媛.光子束不规则射野的等效方野计算方法[J].中华放射医学与防护杂志,2005,25(4):366-367 |
| 光子束不规则射野的等效方野计算方法 |
| Calculation of an equivalent square field for irregular photon beam fields |
| 投稿时间：2004-12-02 |
| DOI： |
| 中文关键词: 不规则射野 等效方野 放射治疗 |
| 英文关键词:Irregular field An equivalent square field Radiotherapy |
| 基金项目: |
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| 摘要点击次数: 2648 |
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| 中文摘要: |
| 目的 探讨一种快捷、准确求光子束不规则射野等效方野的方法。方法 不规则射野按对称射束中心与不对称射束中心分为两类,每类再以不规则野的周长与原开野周长的比值R分为:R>1,R=1,R<1三种情况。选择6种不规则射野,实测吸收剂量;分别用A,B,C3种方法计算其等效方野,用等效后方野剂量参数计算处方剂量,与实测剂量比较。结果 R>1,B方法准确;R=1,A和C方法较准确,B方法亦符合精度要求;R<1,A,B,C方法一致准确。结论 笔者推荐临床使用B方法,便于标准化操作,准确性符合要求。 |
| 英文摘要: |
| Objective To explore a rapid method of calculating an equivalent square field for irregular photon beam fields. Methods Irregular photon fields can be divided into two types: the fields symmetric to the beam central axis and the fields dissymmetric to the beam central axis. Each type contains three conditions (i.e. R>1, R=1, R<1) according to the perimeter ratios of the irregular fields to the original fields. To choose 6 irregular fields and measure the absorption doses. Then work out the equivalent square field of each of the 6 irregular fields by means of A, B and C. Finally compare the prescription doses and those measured. Results In the condition R>1, method B worked precisely. In the condition R=1, method A and method C worked rather precisely, while method B meet the accuracy demand. In the condition R>1, method A, B and C worked precisely and consistently. Conclusion Method B can be recommended for clinical use, for it is convenient for standardized operations and meets the accuracy demand. |
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