Abstract
When the chest wall is treated with tangential radiation fields, a penumbra trimming device known as a breast cone or a breast plate, is often employed to reduce the dose to the lungs. This device is attached to the collimator housing and consists of a metal plate extending to a fixed source-skin distance (SSD), a lucite end window and a lead block to eliminate radiation below the plate. This plate is positioned either on the central axis of the source or at the projection of the edge of the source, thus reducing the field area approximately by a factor of two. The authors consider the effect of the blocking on dose rate and patient scatter, the improvement in penumbra trimming with the block at the edge of the source and the increase in surface dose produced by contamination of the photon beam by the presence of the metal plate and lucite end window.
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