Evaluation of collapsed cone convolution superposition (CCCS) algorithms in prowess treatment planning system for calculating symmetric and asymmetric field size
Purpose: This work investigated the accuracy of prowess treatment planning system (TPS) in dose calculation in a homogenous phantom for symmetric and asymmetric field sizes using collapse cone convolution / superposition algorithm (CCCS).
Methods: The measurements were carried out at source-to-surface distance (SSD) set to 100 cm for 6 and 10 MV photon beams. Data for a full set of measurements for symmetric fields and asymmetric fields, including inplane and crossplane profiles at various depths and percentage depth doses (PDDs) were obtained during measurements on the linear accelerator.
Results: The results showed that the asymmetric collimation dose lead to significant errors (up to approximately 7%) in dose calculations if changes in primary beam intensity and beam quality. It is obvious that the most difference in the isodose curves was found in buildup and the penumbra regions.
Conclusion: The results showed that the dose calculation using Prowess TPS based on CCCS algorithm is generally in excellent agreement with measurements.
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