不规则形状电子射野的输出因子。
Output factors for irregularly shaped electron fields.
作者信息
Kurup R G, Glasgow G P, Leybovich L
机构信息
Department of Radiation Oncology, University of Kansas Cancer Center, Kansas City 66160-7321, USA.
出版信息
Med Dosim. 1995 Fall;20(3):155-9. doi: 10.1016/0958-3947(95)00003-f.
It is necessary to know the output factors (dose per monitor unit at depth of maximum) for irregularly shaped electron beam fields to accurately deliver the prescribed dose to the target. Measuring the output factors for individually shaped electron beam fields for each patient is inconvenient. Using the measured output factors for two square fields, one can obtain the output factor for an irregular shaped electron portal with area intermediate between the areas of the two square fields, by obtaining the equivalent square area (as with photons) of the irregularly shaped field, and then interpolating between the output factors of the two square field areas to obtain the output factor for the irregularly shaped field. This empirical method offers a simple, practical solution. The accuracy of the method is about 1% to 2%, depending on the shape and size of the irregularly shaped electron field.
为了将规定剂量准确地输送到靶区，有必要了解不规则形状电子束野的输出因子（最大深度处每监测单位剂量）。为每个患者单独测量形状各异的电子束野的输出因子很不方便。利用两个方形野的测量输出因子，通过获得不规则形状野的等效方形面积（与光子情况相同），然后在两个方形野面积的输出因子之间进行插值，就可以得到面积介于两个方形野之间的不规则形状电子射野的输出因子。这种经验方法提供了一种简单、实用的解决方案。该方法的精度约为1%至2%，具体取决于不规则形状电子野的形状和大小。
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