ArticleJournal of medical physics
Characterization and Validation of MicroDiamond Detectors in Patient-specific Quality Assurance of Magnetic Resonance-guided Stereotactic Radiotherapy.
Article in Journal of medical physics. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: A dosimetric performance analysis of microDiamond (MD) detector in magnetic resonance imaging linear accelerators (MR-Linac) was performed to evaluate its utility for patient-specific quality assurance (PSQA) in stereotactic radiotherapy (SRT). Methods: Output factors (OFs), depth dose curves, and dose profiles for field sizes from 1 cm × 1 cm to 10 cm × 10 cm were measured in an Elekta Unity 1.5 T MR-Linac. Measurements were conducted using an MR-Safe three-dimensional (3D) water phantom with a PTW Semiflex 3D ionization chamber and a PTW MD detector. Angular response was assessed for orientations perpendicular to the beam and parallel to the magnetic field; correction factors were determined for gantry angles from 0° to 360° in 20° increments. Detectors were cross-calibrated against a 0.6 cc Farmer chamber, and patient-specific point-dose verification was performed for SRT plans. Results: Average Conclusion: The MD detector was successfully validated for MR-Linac. Asymmetric angular dependence due to the Lorentz force was confirmed, necessitating gantry angle-specific corrections for dose estimation. The MD detector demonstrated superior accuracy for small-field SRT targets, confirming its significance for precise PSQA.
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