Abstract
The choice and spacing of multiple radiation ports for cross-firing technics, and the composite isodose patterns produced thereby, have been extensively discussed in radiological literature. Also included among the published data are some examples of “split” fields, wherein two parallel ports an appreciable distance apart, or a single wider port interrupted by a central divider strip of absorbing material, have been arranged to minimize the dose to some sensitive structure within the treated volume. Less generally appreciated are the potentialities of directly conjoined or abutting fields, which may be needed to achieve uniform irradiation of areas too wide for effective coverage by a single beam. We have found it desirable, for example, to treat certain 15 × 20- or 15 × 3D-cm. abdominal ports with a cobalt teletherapy unit which provides only a 15 × 15-cm. aperture at its maximum practicable S.S.D. of 75 cm. The first obvious solution was to expose two 10 × 15- or 15 × 15-cm. areas side by side, with the...
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