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A standardized multifield irradiation technique for breast tumours using asymmetrical collimators and beam angulation

Department of Radiotherapy, University Hospital Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands

Combined angulation and asymmetrical collimator matching techniques are used for field alignment in breast irradiation. A local regional irradiation technique has been developed that allows a uniform dose distribution to the entire target volume. The localization is characterized by simple measurement of a few patient co-ordinates. The equipment settings to produce a theoretical exact field alignment are calculated by a special computer program. These settings guide the simulation. We have designed the method such that the technique is standardized for all patients receiving breast and lymph node irradiation. This allows an easy, accurate and fast patient throughput at the simulator and accelerators.

Key Words: Breast irradiation • Field matching

Received for publication January 14, 1991. Accepted for publication July 2, 1991.