A computer directed method for instant production of lead blocks and compensators for radiation therapy

The projection of the contours of the block marked on the X-ray on to the shielding blocks can be carried out directly with the help of the computer that directs the radiotherapy. This computer could be connected to a multipurpose CNC-Milling machine. Similarly, one could, in the near future, use the data from computertomograms in the computer used to plan the radiotherapy to mould three dimensional compensation filters. The cutting out of the negative moulds from Styrodur, the casting with fluid metal alloys, the imprecision that follows, as well as the health hazards and environmental pollution attached to this process could then be avoided, not to speak of the possibility of total reutilisation of the rests. The positioning of the block ensemble can follow effortlessly and with precision on the lucite plates which have been drilled to accomodate the blocks. (orig./HP)