ArticleJournal of applied clinical medical physics2020
Commissioning of a 1.5T Elekta Unity MR-linac: A single institution experience.
Article in Journal of applied clinical medical physics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 56 papers, 2 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
56 citing papers in PubMed, 2 syntheses or guidelines pooled it, 99 citations in OpenAlex.
- ACPSEM position paper: dosimetry for magnetic resonance imaging linear accelerators.Physical and engineering sciences in medicine · 2023Guideline
- AAPM MEDICAL PHYSICS PRACTICE GUIDELINE 5.b: Commissioning and QA of treatment planning dose calculations-Megavoltage photon and electron beams.Journal of applied clinical medical physics · 2022Guideline
- The role of diffusion-weighted MRI in biological image-guided radiation therapy: a roadmap.Physics in medicine and biology · 2026Review
- Impact of Monaco sequencing parameters on monitor units, plan quality, and optimization time for Elekta Unity liver SBRT plans.Journal of applied clinical medical physics · 2026Article
- Development and validation of a TOPAS Monte Carlo model for a 0.5 T bi-planar Linac-MR.Medical physics · 2026Article
- Evaluation of QUASAR Insight Phantom for daily imaging QA of MRgRT linacs.Journal of applied clinical medical physics · 2026Article
- Ultra-fast dosimetric data collection with a commercial plastic scintillation detector in an MR-linac.Journal of applied clinical medical physics · 2026Article
- Apparent diffusion coefficient as a quantitative biomarker for prostate cancer treatment response on a 1.5 Tesla magnetic resonance-linear accelerator: Impact of image registration and acquisition type.Physics and imaging in radiation oncology · 2025Article
- Evaluation of 2D ion chamber arrays for patient specific quality assurance using a static phantom at a 0.35 T MR-Linac.Zeitschrift fur medizinische Physik · 2025Article
- TrackRAD2025 challenge dataset: real-time tumor tracking for MRI-guided radiotherapy.Medical physics · 2025Article
- 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
- Steps towards overcoming challenges in clinical practice at 1.5T MR-Linac for lung cancer adaptive radiotherapy.BMC cancer · 2025Article
- Commissioning of a motion management system for a 1.5T Elekta Unity MR-Linac: A single institution experience.Journal of applied clinical medical physics · 2025Article
- Real-time target localization on 1.5 T magnetic resonance imaging linac orthogonal cine images using transfer learning.Physics and imaging in radiation oncology · 2025Article
- Real-time tracking of lung tumors using a 1.5T Elekta Unity MR-Linac: first clinical experiences.Frontiers in oncology · 2025Article
- A simulation study of MR-guided proton therapy system using iron-yoked superconducting open MRI: a conceptual study.Journal of radiation research · 2024Article
- Impact of contrast-enhanced CT in the dosimetry of SBRT for liver metastases treated with MR-Linac.Radiation oncology (London, England) · 2024Article
- Multi-institutional questionnaire-based survey on online adaptive radiotherapy performed using commercial systems in Japan in 2023.Radiological physics and technology · 2024Article
- MR-linac MLC positioning QA by digitally stitching dual double-exposed films.Journal of applied clinical medical physics · 2024Article
- Assessment of the deep learning-based gamma passing rate prediction system for 1.5 T magnetic resonance-guided linear accelerator.Radiological physics and technology · 2024Article
Corrections and comments
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Authors and funding
7 authors at 1 institution in 1 country.
Funding
Abstract
MR image-guided radiotherapy has the potential to improve patient care, but integration of an MRI scanner with a linear accelerator adds complexity to the commissioning process. This work describes a single institution experience of commissioning an Elekta Unity MR-linac, including mechanical testing, MRI scanner commissioning, and dosimetric validation. Mechanical testing included multileaf collimator (MLC) positional accuracy, measurement of radiation isocenter diameter, and MR-to-MV coincidence. Key MRI tests included magnetic field homogeneity, geometric accuracy, image quality, and the accuracy of navigator-triggered imaging for motion management. Dosimetric validation consisted of comparison between measured and calculated PDDs and profiles, IMRT measurements, and end-to-end testing. Multileaf collimator positional accuracy was within 1.0 mm, the measured radiation isocenter walkout was 0.20 mm, and the coincidence between MR and MV isocenter was 1.06 mm, which is accounted for in the treatment planning system (TPS). For a 350-mm-diameter spherical volume, the peak-to-peak deviation of the magnetic field homogeneity was 4.44 ppm and the geometric distortion was 0.8 mm. All image quality metrics were within ACR recommendations. Navigator-triggered images showed a maximum deviation of 0.42, 0.75, and 3.0 mm in the target centroid location compared to the stationary target for a 20 mm motion at 10, 15, and 20 breaths per minute, respectively. TPS-calculated PDDs and profiles showed excellent agreement with measurement. The gamma passing rate for IMRT plans was 98.4 ± 1.1% (3%/ 2 mm) and end-to-end testing of adapted plans showed agreement within 0.4% between ion-chamber measurement and TPS calculation. All credentialing criteria were satisfied in an independent end-to-end test using an IROC MRgRT phantom.
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Registered trials
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.