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Margins between clinical target volume and planning target volume for electron beam therapy

Medical Physics, Addenbrooke's Hospital, Cambridge CB2 2QQ, UK

View larger version (24K): [in a new window]   Figure 1. A typical electron treatment. The planning target volume(PTV) is shown in dark grey, the collimator (cut-out) is shown in light grey. The 90% isodose conforms to the PTV in the xy plane, at the depth of maximum PTV width.

View larger version (11K): [in a new window]   Figure 2. This illustrates the use of a gaussian to model the shape of the depth dose curve. The line is measured beam data for a 15 MeV beam, the points are calculated from Equation (5), using a pdd of 12 mm. A close fit is observed from the depth of maximum dose down to the depth of 5%.