ArticleJournal of medical physics
Feasibility of Using Machine Performance Check-enhanced Couch Check as a Daily Surrogate for Multisphere Winston-Lutz Testing in Single-isocenter Multitarget Stereotactic Radiosurgery.
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
Single-isocenter multitarget (SIMT) stereotactic radiosurgery (SRS) requires submillimeter geometric accuracy. Although Winston-Lutz (WL) testing remains the stereotactic standard, it is time-intensive. This study evaluated whether Varian's machine performance check (MPC)-enhanced couch check can serve as a surrogate for WL by comparing geometric agreement across routine clinical use. WL tests were performed on 23 SRS/SRT treatment days using a multisphere VisionRT phantom. MPC-enhanced couch check data were extracted for the same dates, including maximum positioning error (MPC-max) and rotation-induced couch shift (MPC-shift). Agreement between WL and MPC was evaluated using Pearson correlation and Bland-Altman analysis. WL values ranged from 0.27 to 0.67 mm. MPC-max and MPC-shift ranged from 0.37 to 0.44 mm and 0.33 to 0.49 mm, respectively. Correlation between WL and both MPC metrics was high (
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