论文信息 - AUTOMATION OF RADIATION TREATMENT PLANNING. IV. DERIVATION OF A MATHEMATICAL EXPRESSION FOR THE PER CENT DEPTH DOSE SURFACE OF COBALT 60 BEAMS AND VISUALISATION OF MULTIPLE FIELD DOSE DISTRIBUTIONS.

AUTOMATION OF RADIATION TREATMENT PLANNING. IV. DERIVATION OF A MATHEMATICAL EXPRESSION FOR THE PER CENT DEPTH DOSE SURFACE OF COBALT 60 BEAMS AND VISUALISATION OF MULTIPLE FIELD DOSE DISTRIBUTIONS.

A formula is presented for approximating the per cent depth distribution resulting from any portal size 60Co beam at 80 cm SSD. This equation may be used to obtain computer print-outs of combined multifield dose distributions as described previously (Sterling et al., 1963b), or, in a new programme, can be used to print out the combined isodose curves directly to scale with small error. A distinct geometric property of the per cent depth dose distribution is discovered and described without attempting to explain it.

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