Abstract
Masks are often employed for patient immobilisation in radiotherapy. Due to the use of masks, increased skin reactions in the irradiation field have been observed. As a source of secondary electrons and scattered radiation, the mask induces displacement of the depth dose curves, resulting in dose enhancement within the epidermal layers. This effect has been investigated for four mask materials, varying the energy of the photon radiation, the number of the mask layers, the field size and the distance between mask and skin. The measured dose build-up caused by the masks shows this effect to be dominant in the first four millimeters of the skin, which are considered as especially radiosensitive. Moreover the results indicate that the number of mask layers in the irradiation field should be limited to a single one.
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