Abstract
Introduction The success of radiotherapy depends on the accuracy and the reproducibility of daily setup and treatment delivery. The aim of this phantom study was to (a) deliberately introduce realistic setup errors and (b) determine the dosimetric impact as a result of the known offset. Materials and methods An anthropomorphic phantom, Catphan® phantom, Varian Trilogy Linac, Philips Big bore CT scanner (pCT) and Eclipse TPS were used in this study. Three cone-beam CT (CBCT) setup fields per fraction were created to determine pre-treatment, post-correction and post-delivery setup errors. Each fraction was assigned 4 plans and 3 observers carried out 3 independent setups with a deliberate 3 mm setup error and 1 observer setup as accurate as possible. The structures were copied from the pCT into the registered CBCT and the dose volume histogram was then recalculated and compared with original pCT dose. Results The pre-treatment setup errors were found to be Conclusion Complex treatments were delivered with deliberate offsets and the offset was found to have an impact on the dose delivered to the target, especially in H&N plans.
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