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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