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Commissioning and performance evaluation of RadCalc for the Elekta unity MRI-linac
Journal article   Open access   Peer reviewed

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

Stephen A. Graves, Jeffrey E. Snyder, Amanda Boczkowski, Joel St-Aubin, Dongxu Wang, Sridhar Yaddanapudi and Daniel E. Hyer
Journal of applied clinical medical physics, Vol.20(12), pp.54-62
12/01/2019
DOI: 10.1002/acm2.12760
PMCID: PMC6909114
PMID: 31722133
url
https://doi.org/10.1002/acm2.12760View
Published (Version of record) Open Access

Abstract

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).
 Life Sciences & Biomedicine Radiology, Nuclear Medicine & Medical Imaging Science & Technology

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