ArticlePhysics in medicine and biology2017
Characterization of spatial distortion in a 0.35 T MRI-guided radiotherapy system.
Article in Physics in medicine and biology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers.
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Who cites it
33 citing papers in PubMed.
- Innovative approaches in precision radiation oncology: advanced imaging technologies and challenges which shape the future of radiation therapy.Frontiers in medicine · 2025Review
- A deep learning algorithm to generate synthetic computed tomography images for brain treatments from 0.35 T magnetic resonance imaging.Physics and imaging in radiation oncology · 2025Article
- 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
- The First Report of Using Low-Field MRI-Guided Radiation Therapy in a Patient With a Cochlear Implant.Advances in radiation oncology · 2024Article
- Case report: Intrafraction dose-guided tracking for gastrointestinal organ-at-risk isotoxicity delivery on an MR-guided radiotherapy system.Frontiers in oncology · 2024Article
- Distortion-corrected image reconstruction with deep learning on an MRI-Linac.Magnetic resonance in medicine · 2023Article
- Adaptive radiotherapy for breast cancer.Clinical and translational radiation oncology · 2023Review
- Rapid distortion correction enables accurate magnetic resonance imaging-guided real-time adaptive radiotherapy.Physics and imaging in radiation oncology · 2023Article
- Generation of synthetic megavoltage CT for MRI-only radiotherapy treatment planning using a 3D deep convolutional neural network.Medical physics · 2022Article
- Dosimetric evaluation of respiratory gating on a 0.35-T magnetic resonance-guided radiotherapy linac.Journal of applied clinical medical physics · 2022Article
- Head and neck radiotherapy on the MR linac: a multicenter planning challenge amongst MRIdian platform users.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2021Article
- First clinical experience of correcting phantom-based image distortion related to gantry position on a 0.35T MR-Linac.Journal of applied clinical medical physics · 2021Article
- Clinical assessment of geometric distortion for a 0.35T MR-guided radiotherapy system.Journal of applied clinical medical physics · 2021Article
- Technical Challenges of Real-Time Adaptive MR-Guided Radiotherapy.Frontiers in oncology · 2021Review
- A Comparison of the Distortion in the Same Field MRI and MR-Linac System With a 3D Printed Phantom.Frontiers in oncology · 2021Article
- Characterization of radiotherapy component impact on MR imaging quality for an MRgRT system.Journal of applied clinical medical physics · 2020Article
- Evaluation of cine imaging during multileaf collimator and gantry motion for real-time magnetic resonance guided radiation therapy.Journal of applied clinical medical physics · 2020Article
- Imaging performance of a high-field in-line magnetic resonance imaging linear accelerator with a patient rotation system for fixed-gantry radiotherapy.Physics and imaging in radiation oncology · 2020Article
- Medical physics challenges in clinical MR-guided radiotherapy.Radiation oncology (London, England) · 2020Review
- MRI-guided stereotactic ablative radiation therapy of spinal bone metastases: a preliminary experience.The British journal of radiology · 2020Article
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10 authors.
Funding
Abstract
Spatial distortion results in image deformation that can degrade accurate targeting and dose calculations in MRI-guided adaptive radiotherapy. The authors present a comprehensive assessment of a 0.35 T MRI-guided radiotherapy system's spatial distortion using two commercially-available phantoms with regularly spaced markers. Images of the spatial integrity phantoms were acquired using five clinical protocols on the MRI-guided radiotherapy machine with the radiotherapy gantry positioned at various angles. Software was developed to identify and localize all phantom markers using a template matching approach. Rotational and translational corrections were implemented to account for imperfect phantom alignment. Measurements were made to assess uncertainties arising from susceptibility artifacts, image noise, and phantom construction accuracy. For a clinical 3D imaging protocol with a 1.5 mm reconstructed slice thickness, 100% of spheres within a 50 mm radius of isocenter had a 3D deviation of 1 mm or less. Of the spheres within 100 mm of isocenter, 99.9% had a 3D deviation less than 1 mm. 94.8% and 100% of the spheres within 175 mm were found to be within 1 mm and 2 mm of the expected positions in 3D respectively. Maximum 3D distortions within 50 mm, 100 mm and 175 mm of isocenter were 0.76 mm, 1.15 mm and 1.88 mm respectively. Distortions present in images acquired using the real-time imaging sequence were less than 1 mm for 98.1% and 95.0% of the cylinders within 50 mm and 100 mm of isocenter. The corresponding maximum distortion in these regions was 1.10 mm and 1.67 mm. These results may be used to inform appropriate planning target volume (PTV) margins for 0.35 T MRI-guided radiotherapy. Observed levels of spatial distortion should be explicitly considered when using PTV margins of 3 mm or less or in the case of targets displaced from isocenter by more than 50 mm.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.