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Evaluation of the optimal co-planar field arrangement for use in the boost phase of dose escalated conformal radiotherapy for localized prostate cancer

¹ The Academic Unit of Radiotherapy & Oncology
² The Joint Department of Physics, The Institute of Cancer Research and The Royal Marsden NHS Trust, Downs Road, Sutton, Surrey, SM2 5PT, UK

View larger version (23K): [in a new window]   Figure 1. Schematic representation of the three-field (3F), four-field (4F) and six-field (6F) co-planar plans. The gantry angles for each plan type are noted in parentheses. Note that the presence of a wedge on a particular beam does not necessarily imply that it is used in practice, as the beam weight optimization program may select a low weight for the wedged component of that field.

View larger version (19K): [in a new window]   Figure 2. Irradiated rectal volumes (V50 to V90) of the best three-field ( ), four-field (X) and six-field () plans compared with the current 6F plan () used at The Royal Marsden Hospital.