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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

V S Khoo, FRACR, MD1, J L Bedford, PhD2, S Webb, PhD, FInstP, FIPEM2 and D P Dearnaley, FRCR, FRCP, MD1

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



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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.

 


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Figure 2. Irradiated rectal volumes (V50 to V90) of the best three-field ({triangleup} ), four-field (X) and six-field ({circ}) plans compared with the current 6F plan ({blacksquare}) used at The Royal Marsden Hospital.

 





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