Abstract
This article compares two algorithms for determining beam weights and wedge filters for conformal treatment planning. One algorithm, which is based on dose‐gradient analysis, provides analytic formulas for determining beam weights, wedge angles, and collimator angles (i.e., wedge orientations) so that the dose distribution is homogeneous in the target volume. The second algorithm is based on the concept of the super‐omni wedge (i.e., the arrangement of two pairs of orthogonal nominal wedged beams), numerically optimize beam weights, wedge angles, and collimator angles so that the dose requirements to targets and organs at risk are satisfied to the best. Three clinical cases were tested. For the first case, both algorithms resulted in comparable homogeneous dose distributions in the target volume. For the second case, the second algorithm resulted in much lower doses to the eyes plus a better homogeneous dose distribution in the target volume. For the third case, only the second algorithm was applicable, and the treatment plan it developed met the prescribed requirements. The results show that the first algorithm is better in terms of feasibility, whereas the second is better in terms of applicability and the quality of treatment plans.PACS number(s): 87.53.–j
Highlights
One task of conformal treatment planning is to determine beam weights, wedge orientations, and wedge angles
The quality of treatment plans is evaluated with the dose uniformity in target volumes and the maximum doses received by organs at risk
When algorithm No 1 was used, the beam weights, wedge angles, and collimator angles were manually calculated with a calculator
Summary
One task of conformal treatment planning is to determine beam weights, wedge orientations, and wedge angles. This task can be accomplished manually through a trial-and-error procedure or automatically through an algorithm-guided procedure. Manual adjustment of these parameters requires time and experienced planners. The resulting plans are at best feasible but not necessarily optimal, especially when multiple noncoplanar beams are included. Developing algorithms for automatic determination of beam weights, wedge orientations, and wedge angles is desirable. Because dose distributions are linear functions of beam weights, automatic determination only of beam weights is straightforward and has been well investigated.
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