ArticleJournal of applied clinical medical physics2025
Enhanced analysis of gating latency in 0.35T MR-linac through innovative time synchronization of a motion phantom and plastic scintillation detector.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Enhanced analysis of gating latency in 0.35T MR-linac through innovative time synchronization of a motion phantom and plastic scintillation detector.Journal of applied clinical medical physics · 2025Article
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5 authors.
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Abstract
purposeThis study aims to evaluate how different gantry angles, breathing rates (BPM), cine image speeds, and tracking algorithms affect beam on/off latency and the subsequent impact on target dose for a 0.35T MR-Linac with a 6 MV FFF beam. The investigation incorporates an image-based MRI4D modus QA motion phantom (MQA) and a measurement-based plastic scintillation detector (PSD).
methodsThe MQA's target was customized with an insertion for a 1 mm PSD from BluePhysics. Both the PSD and the MQA were simultaneously synchronized to the Linac to capture latency signals. A plan was created in the ViewRay TPS to deliver dose to the target at three gantry angles (0°, 120°, and 240°). Each gantry angle was evaluated at three breathing rates (10, 12, and 15 BPM). The study also examined two imaging speeds (4 and 8 FPS) and four tracking algorithms.
resultsAcross all configurations at 4 FPS, the overall mean beam-on latency was 0.339 ± 0.06 s from the PSD and 0.318 ± 0.06 s from the MQA, whereas at 8 FPS it was 0.630 ± 0.07 s (PSD) and 0.609 ± 0.07 s (MQA). Conversely, the overall mean beam-off latency at 4 FPS was 0.153 ± 0.03 s (PSD) and 0.124 ± 0.03 s (MQA), while at 8 FPS it was 0.121 ± 0.06 s (PSD) and 0.205 ± 0.04 s (MQA). The overall mean difference between gating and non-gating doses was an increase of 12.050 ± 9.2 cGy at 4 FPS and 14.044 ± 7.4 cGy at 8 FPS.
conclusionThis comprehensive study underscores the significant influence of gantry angle, breathing rate, cine imaging speed, and tracking algorithms on latency and dose delivery accuracy in a 0.35T MR-Linac.
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