A system for stereotactic radiosurgery with a linear accelerator (original) (raw)
1988, International Journal of Radiation Oncology Biology Physics
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Medical Physics, 2020
PurposeMRI is the gold‐standard imaging modality for brain tumor diagnosis and delineation. The purpose of this work was to investigate the feasibility of performing brain stereotactic radiosurgery (SRS) with a 0.35 T MRI‐guided linear accelerator (MRL) equipped with a double‐focused multileaf collimator (MLC). Dosimetric comparisons were made vs a conventional C‐arm‐mounted linac with a high‐definition MLC.MethodsThe quality of MRL single‐isocenter brain SRS treatment plans was evaluated as a function of target size for a series of spherical targets with diameters from 0.6 cm to 2.5 cm in an anthropomorphic head phantom and six brain metastases (max linear dimension = 0.7‐1.9 cm) previously treated at our clinic on a conventional linac. Each target was prescribed 20 Gy to 99% of the target volume. Step‐and‐shoot IMRT plans were generated for the MRL using 11 static coplanar beams equally spaced over 360° about an isocenter placed at the center of the target. Couch and collimator an...
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