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Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac

Recent availability of MRI‐guided linear accelerators has introduced a number of clinical challenges, particularly in the context of online plan adaptation. Paramount among these is verification of plan quality prior to patient treatment. Currently, there are no commercial products available for mon...

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Autores principales: Graves, Stephen A., Snyder, Jeffrey E., Boczkowski, Amanda, St‐Aubin, Joël, Wang, Dongxu, Yaddanapudi, Sridhar, Hyer, Daniel E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6909114/
https://www.ncbi.nlm.nih.gov/pubmed/31722133
http://dx.doi.org/10.1002/acm2.12760
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author Graves, Stephen A.
Snyder, Jeffrey E.
Boczkowski, Amanda
St‐Aubin, Joël
Wang, Dongxu
Yaddanapudi, Sridhar
Hyer, Daniel E.
author_facet Graves, Stephen A.
Snyder, Jeffrey E.
Boczkowski, Amanda
St‐Aubin, Joël
Wang, Dongxu
Yaddanapudi, Sridhar
Hyer, Daniel E.
author_sort Graves, Stephen A.
collection PubMed
description Recent availability of MRI‐guided linear accelerators has introduced a number of clinical challenges, particularly in the context of online plan adaptation. Paramount among these is verification of plan quality prior to patient treatment. Currently, there are no commercial products available for monitor unit verification that fully support the newly FDA cleared Elekta Unity 1.5 T MRI‐linac. In this work, we investigate the accuracy and precision of RadCalc for this purpose, which is a software package that uses a Clarkson integration algorithm for point dose calculation. To this end, 18 IMRT patient plans (186 individual beams) were created and used for RadCalc point dose calculations. In comparison with the primary treatment planning system (Monaco), mean point dose deviations of 0.0 ± 1.0% (n = 18) and 1.7 ± 12.4% (n = 186) were obtained on a per‐plan and per‐beam basis, respectively. The dose plane comparison functionality within RadCalc was found to be highly inaccurate, however, modest improvements could be made by artificially shifting jaws and multi leaf collimator positions to account for the dosimetric shift due to the magnetic field (67.3% vs 96.5% mean 5%/5 mm gamma pass rate).
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spelling pubmed-69091142019-12-20 Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac Graves, Stephen A. Snyder, Jeffrey E. Boczkowski, Amanda St‐Aubin, Joël Wang, Dongxu Yaddanapudi, Sridhar Hyer, Daniel E. J Appl Clin Med Phys Radiation Oncology Physics Recent availability of MRI‐guided linear accelerators has introduced a number of clinical challenges, particularly in the context of online plan adaptation. Paramount among these is verification of plan quality prior to patient treatment. Currently, there are no commercial products available for monitor unit verification that fully support the newly FDA cleared Elekta Unity 1.5 T MRI‐linac. In this work, we investigate the accuracy and precision of RadCalc for this purpose, which is a software package that uses a Clarkson integration algorithm for point dose calculation. To this end, 18 IMRT patient plans (186 individual beams) were created and used for RadCalc point dose calculations. In comparison with the primary treatment planning system (Monaco), mean point dose deviations of 0.0 ± 1.0% (n = 18) and 1.7 ± 12.4% (n = 186) were obtained on a per‐plan and per‐beam basis, respectively. The dose plane comparison functionality within RadCalc was found to be highly inaccurate, however, modest improvements could be made by artificially shifting jaws and multi leaf collimator positions to account for the dosimetric shift due to the magnetic field (67.3% vs 96.5% mean 5%/5 mm gamma pass rate). John Wiley and Sons Inc. 2019-11-13 /pmc/articles/PMC6909114/ /pubmed/31722133 http://dx.doi.org/10.1002/acm2.12760 Text en © 2019 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Radiation Oncology Physics
Graves, Stephen A.
Snyder, Jeffrey E.
Boczkowski, Amanda
St‐Aubin, Joël
Wang, Dongxu
Yaddanapudi, Sridhar
Hyer, Daniel E.
Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title_full Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title_fullStr Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title_full_unstemmed Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title_short Commissioning and performance evaluation of RadCalc for the Elekta unity MRI‐linac
title_sort commissioning and performance evaluation of radcalc for the elekta unity mri‐linac
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6909114/
https://www.ncbi.nlm.nih.gov/pubmed/31722133
http://dx.doi.org/10.1002/acm2.12760
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