Dynamic collimator trajectory algorithm for multiple metastases dynamic conformal arc treatment planning

Medical Physics
R Lee MacDonaldAlasdair Syme

Abstract

To develop an algorithm for dynamic collimator positioning to optimize beam's eye view (BEV) fitting of targets in dynamic conformal arc (DCA)-based radiotherapy procedures, of particular use in multiple metastases stereotactic radiosurgery procedures. A trajectory algorithm was developed to dynamically modify the angle of the collimator as a function of arc-based control point to provide optimized collimation of target volume(s). Central to this algorithm is a concept denoted herein as "whitespace" defined as any nontarget area in the BEV that is not covered by any collimation system and is open to exposure from the radiation beam. Calculating whitespace at all collimator angles and every control point, a two-dimensional topographical map depicting the tightness-of-fit of the MLC was generated. A bidirectional gradient trajectory algorithm identified a number of candidate trajectories of continuous collimator motion. Minimization of integrated whitespace was used to identify an optimal solution for the navigation of the parameter space. Plans with dynamic collimator trajectories were designed for multiple metastases targets and were compared with fixed collimator angle dynamic conformal arc (DCA) plans and standard VMAT plans....Continue Reading

References

Feb 5, 2000·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·D Verellen, F Vanhavere
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Mar 8, 2011·International Journal of Radiation Oncology, Biology, Physics·Yingli YangMargie Hunt
May 17, 2015·Medical Physics·R Lee MacDonald, Christopher G Thomas

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Citations

Jul 12, 2018·Medical Physics·Michael K FixPeter Manser
Aug 19, 2020·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·William M GilesJustus D Adamson

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