Determination of secondary collimator shape in electron arc therapy

The characteristic angle- beta concept in electron arc therapy of non-cylindrical target volumes is applied in determining the required shape of the arced electron field to yield a uniform dose distribution inside the target volume. The empirical relationships derived for this purpose from the angle- beta concept are valid for all field widths and thus offer an improvement over the currently known empirical relationships which were derived as small-field-width approximations. The validity of the determination of field shapes in electron arc therapy with the empirical relationships based on the angle- beta concept is confirmed by measurements of dose distributions in a spherical phantom.

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