1. Evaluation of a magnetic resonance guided linear accelerator for stereotactic radiosurgery treatment
- Author
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Carri K Glide-Hurst, Ilma Xhaferllari, M. Salim Siddiqui, Eric Laugeman, S. Kalkanis, Anthony Doemer, Joshua Kim, Indrin J. Chetty, Ning Wen, Chang Liu, Benjamin Movsas, M Bellon, James Victoria, and A Kumarasiri
- Subjects
Computer science ,medicine.medical_treatment ,Radiosurgery ,Article ,Imaging phantom ,Linear particle accelerator ,030218 nuclear medicine & medical imaging ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,law ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Radiation treatment planning ,Retrospective Studies ,medicine.diagnostic_test ,Brain Neoplasms ,Phantoms, Imaging ,business.industry ,Radiotherapy Planning, Computer-Assisted ,Isocenter ,Radiotherapy Dosage ,Magnetic resonance imaging ,Particle accelerator ,Hematology ,Magnetic Resonance Imaging ,Conformity index ,Oncology ,030220 oncology & carcinogenesis ,Radiotherapy, Intensity-Modulated ,Particle Accelerators ,Nuclear medicine ,business - Abstract
Introduction The purpose of this study was to investigate the systematic localization accuracy, treatment planning capability, and delivery accuracy of an integrated magnetic resonance imaging guided Linear Accelerator (MR-Linac) platform for stereotactic radiosurgery. Materials and methods The phantom for the end-to-end test comprises three different compartments: a rectangular MR/CT target phantom, a Winston–Lutz cube, and a rectangular MR/CT isocenter phantom. Hidden target tests were performed at gantry angles of 0, 90, 180, and 270 degrees to quantify the systematic accuracy. Five patient plans with a total of eleven lesions were used to evaluate the dosimetric accuracy. Single-isocenter IMRT treatment plans using 10–15 coplanar beams were generated to treat the multiple metastases. Results The end-to-end localization accuracy of the system was 1.0 ± 0.1 mm. The conformity index, homogeneity index and gradient index of the plans were 1.26 ± 0.22, 1.22 ± 0.10, and 5.38 ± 1.44, respectively. The average absolute point dose difference between measured and calculated dose was 1.64 ± 1.90%, and the mean percentage of points passing the 3%/1 mm gamma criteria was 96.87%. Conclusions Our experience demonstrates that excellent plan quality and delivery accuracy was achievable on the MR-Linac for treating multiple brain metastases with a single isocenter.
- Published
- 2018