Abstract
In radiotherapy treatment, portal images and digitally reconstructed radiographs (DRRs) are the most frequently used image‐guidance systems to monitor patient setup during clinical routine. DRR is therefore a critical element in the process of virtual simulation and patient position verification in radiotherapy. The aim of this work was to assess the geometric reliability of the DRR generated by XiO, Pinnacle, Odyssey and Oncentra Masterplan treatment planning systems (TPS). Instead of the computed tomography (CT) images of a quality assurance phantom, two synthetic phantoms were created and used to asses the linearity and the ray tracing reliability of the DRR generators. The obtained results demonstrate that the linearity and the reliability of DRR generators was less than 1 pixel for all TPSs.PACS numbers: 87.55.D, 87.57.cp,87.57.nf
Highlights
Patient setup is a crucial point as the patient position registered in the computed tomography (CT) images used by treatment planning system (TPS) must be reproduced during each treatment session
This study aims to present a method which, instead of real CT data, uses computerized phantoms to test the geometrical reliability of the digitally reconstructed radiographs (DRRs) generators embedded in XiO, Pinnacle, Odyssey, and Oncentra Masterplan treatment planning systems (TPS)
In the DRRs generated using Pinnacle and Odyssey TPSs, the measured differences ∆y and ∆x are almost the same, while a slight different behavior is observed for XiO and Oncentra Masterplan
Summary
Patient setup is a crucial point as the patient position registered in the computed tomography (CT) images used by treatment planning system (TPS) must be reproduced during each treatment session. Setup is routinely verified by comparing portal images with a reference image which records the intended patient position. As a reference, both simulator images and digitally reconstructed radiographs (DRR) can be used[1] but in order to limit the onset of adjunctive error, the simulator step is often skipped and the DRR is widely recognized as the reference image.[2]. DRRs are critical elements in the process of patient position verification. When portal images are registered on DRRs, the geometrical accuracy of both images must be guaranteed in order to trust the registration results and use these data to correct patient setup. Two phantoms[6,7] containing test patterns were developed and used to evaluate image quality and geometrical accuracy of DRR
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