Clinical implementation of a computer controlled milling machine for compensating filter production

The procedures required for the clinical implementation of a computer contr olled milling machine for producing compensators for breast radiotherapy ar e described. Moulds are cut in a rigid polymer foam block and filled with s tainless-steel granulate. Quality assurance procedures are described for en suring that the compensators produced are consistent and accurate. Relative and absolute dosimetric measurements are presented showing that the compen sators are accurate to better than 1% and demonstrate the technique to be c linically acceptable.