ArticleJournal of applied clinical medical physics2023
System-dependent image distortion related to gantry positions of a 0.35 T MRgRT: Characterization and the corresponding correction.
Article in Journal of applied clinical medical physics, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Characterization of spatial integrity with active and passive implants in a low-field magnetic resonance linear accelerator scanner.Physics and imaging in radiation oncology · 2024Article
- System-dependent image distortion related to gantry positions of a 0.35 T MRgRT: Characterization and the corresponding correction.Journal of applied clinical medical physics · 2023Article
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5 authors.
Funding
Abstract
purposeMR-guided radiotherapy with high accuracy treatment planning requires addressing MR imaging artifacts that originate from system imperfections. This work presents the characterization and corresponding correction of gantry-related imaging distortions including geometric distortion and isocenter shift in a 0.35 T magnetic resonance imaging (MRI)-guided radiotherapy (MRgRT) system using distortion vector fields (DVFs).
methodsTwo phantoms, the magnetic resonance imaging distortion in 3D (MRID
resultsGeometric distortion with "mean (± SD) distortion" of 3.2 ± 0.02, 2.9 ± 0.02, and 1.8 ± 0.01 mm and isocenter shift (±SD) of 0.49 ± 0.3, 0.05 ± 0.2, and 0.01 ± 0.03 mm were present in the DstOff MRID
conclusionThe gantry-related MR imaging distortion including geometric distortion and isocenter shift was characterized and a corresponding correction was demonstrated using extended DVFs on 0.35 T MRgRT system. The characterized gantry-related isocenter shift can be combined with geometric distortion correction to provide a technique for the correction of the full system-dependent distortion in an MRgRT system.
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