[Construction of tissue compensating filters for extended areas in Hodgkin-irradiation on the basis of moiré topography (author's transl)].

In order to obtain a homogeneous distribution of the dose over extended fields in radiotherapy of Hodgkin's disease, for an exact dosage within the irradiated region it is necessary to consider the topography of the patient. The skin protective build-up effect due to the use of bolus materials would be lost with telecobalt irradiation, and therefore tissue compensating filters with a large surface are to be preferred. A simple method of making such filters by means of the moirétopography is described. The way to obtain a compensation filter for extended areas is demonstrated by an example showing how to construct it from lead plates correct in scale and layerwise.