Abstract
For lesions of the head and neck, similar field arrangements are required for 35 MeV electron and 4 MV X-ray treatments, and the resultant combined isodoses are very similar. For deep lesions of the trunk, the X-ray treatment plans are better than electron treatments. These conclusions are slightly weighted in favour of the electron treatment, because here the combined isodoses are based on idealised isodose charts which ignore beam edge effects. It is concluded that electron beam therapy has no advantages over megavoltage X-ray therapy.
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