The influence of beam parameters on percentage depth dose in electron arc therapy

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Abstract
The dependence of rotational or arc electron beam percentage depth doses on the depth of isocenter di and nominal beam field width w is presented. A characteristic angle .beta., which uniquely depends on w and di, is defined and the dependence of the radial percentage depth doses on angle .beta. discussed. It is shown that the characteristic angle .beta. concept can be used in clinical situations to predict the shape of the percentage depth dose curve when w and di are known, or, more importantly, it can be used to determine the appropriate w when di and the percentage depth dose characteristics are known.