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A method of gap and field size determination for abutting a treatment field to a previously treated area
1Department of Radiation Therapy, Medical College of Ohio, Toledo 43699, USA.
Abstract:
A simple method of determining the new field size and the skin gap needed when abutting to a previously treated (or simulated) field is presented. The more complex case of abutting a treatment field between two previously treated fields and determining the new field length and the skin gap at each end is also addressed. Both methods utilize a single measurement on the patient's skin and the commonly used gap formula based on similar triangles. Both methods easily lend themselves to implementation through a simple BASIC program which eases any difficulties in calculation encountered during simulation.
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