Stijn Oolbekkink, Pim T. S. Borman, Jochem W. H. Wolthaus, Bram van Asselen, Astrid L. H. M. W. van Lier, Stephanie Dunn, Grant R. Koenig, Nick Hartman, Niusha Kheirkhah, Bas W. Raaymakers, Martin F. Fast
{"title":"表征核磁共振兼容运动平台的质量保证运动补偿治疗的1.5 T核磁共振直线。","authors":"Stijn Oolbekkink, Pim T. S. Borman, Jochem W. H. Wolthaus, Bram van Asselen, Astrid L. H. M. W. van Lier, Stephanie Dunn, Grant R. Koenig, Nick Hartman, Niusha Kheirkhah, Bas W. Raaymakers, Martin F. Fast","doi":"10.1002/mp.17632","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Background</h3>\n \n <p>Novel motion-compensated treatment techniques on the MR-linac can address adverse intra-fraction motion effects. These techniques involve beam gating or intra-fraction adaptations of the treatment plan based on real-time magnetic resonance imaging (MRI) performed during treatment. For quality assurance (QA) of these workflows, a multi-purpose motion platform is desirable. This platform should accommodate various phantoms, enabling multiple QA workflows.</p>\n </section>\n \n <section>\n \n <h3> Purpose</h3>\n \n <p>This study aims to evaluate the new IBA QUASAR Motion MR Platform for use in the 1.5 T MR-linac.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>The motion platform was assessed for several magnetic resonance (MR) characteristics, including spurious noise generation and B0&B1 homogeneity. In addition, the motion platform's motion accuracy and beam attenuation were assessed. An application was shown with a ScandiDos Delta4 Phantom+ MR demonstrating patient-specific plan QA of gated treatments using time-resolved dosimetry that includes motion based on a patient's respiratory motion trace.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>All MR characterization measurements were within the set tolerances for MRI QA. The motion platform motion accuracy showed excellent agreement with the reference, with a standard deviation of the amplitude of 0.01 mm (20 kg load) for the motor's self-estimated positions and 0.22 mm (no load) for the images acquired with the electronic portal imager. Beam attenuation was found to be 11.8%. The combination of the motion platform and Delta4 demonstrated motion-included dosimetry at high temporal and spatial resolutions. Motion influenced the measured dose in non-gated treatments by up to −20.1%, while gated deliveries showed differences of up to −1.7% for selected diodes.</p>\n </section>\n \n <section>\n \n <h3> Conclusion</h3>\n \n <p>The motion platform was found to be usable in a 1.5 T magnetic field, and for all MR characterization experiments, no influence from the motion platform was observed. This motion platform enables to perform motion-included QA, with a measurement device of choice.</p>\n </section>\n </div>","PeriodicalId":18384,"journal":{"name":"Medical physics","volume":"52 5","pages":"3391-3397"},"PeriodicalIF":3.2000,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mp.17632","citationCount":"0","resultStr":"{\"title\":\"Characterization of an MR-compatible motion platform for quality assurance of motion-compensated treatments on the 1.5 T MR-linac\",\"authors\":\"Stijn Oolbekkink, Pim T. S. Borman, Jochem W. H. Wolthaus, Bram van Asselen, Astrid L. H. M. W. van Lier, Stephanie Dunn, Grant R. Koenig, Nick Hartman, Niusha Kheirkhah, Bas W. Raaymakers, Martin F. Fast\",\"doi\":\"10.1002/mp.17632\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Background</h3>\\n \\n <p>Novel motion-compensated treatment techniques on the MR-linac can address adverse intra-fraction motion effects. These techniques involve beam gating or intra-fraction adaptations of the treatment plan based on real-time magnetic resonance imaging (MRI) performed during treatment. For quality assurance (QA) of these workflows, a multi-purpose motion platform is desirable. This platform should accommodate various phantoms, enabling multiple QA workflows.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Purpose</h3>\\n \\n <p>This study aims to evaluate the new IBA QUASAR Motion MR Platform for use in the 1.5 T MR-linac.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>The motion platform was assessed for several magnetic resonance (MR) characteristics, including spurious noise generation and B0&B1 homogeneity. 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Characterization of an MR-compatible motion platform for quality assurance of motion-compensated treatments on the 1.5 T MR-linac
Background
Novel motion-compensated treatment techniques on the MR-linac can address adverse intra-fraction motion effects. These techniques involve beam gating or intra-fraction adaptations of the treatment plan based on real-time magnetic resonance imaging (MRI) performed during treatment. For quality assurance (QA) of these workflows, a multi-purpose motion platform is desirable. This platform should accommodate various phantoms, enabling multiple QA workflows.
Purpose
This study aims to evaluate the new IBA QUASAR Motion MR Platform for use in the 1.5 T MR-linac.
Methods
The motion platform was assessed for several magnetic resonance (MR) characteristics, including spurious noise generation and B0&B1 homogeneity. In addition, the motion platform's motion accuracy and beam attenuation were assessed. An application was shown with a ScandiDos Delta4 Phantom+ MR demonstrating patient-specific plan QA of gated treatments using time-resolved dosimetry that includes motion based on a patient's respiratory motion trace.
Results
All MR characterization measurements were within the set tolerances for MRI QA. The motion platform motion accuracy showed excellent agreement with the reference, with a standard deviation of the amplitude of 0.01 mm (20 kg load) for the motor's self-estimated positions and 0.22 mm (no load) for the images acquired with the electronic portal imager. Beam attenuation was found to be 11.8%. The combination of the motion platform and Delta4 demonstrated motion-included dosimetry at high temporal and spatial resolutions. Motion influenced the measured dose in non-gated treatments by up to −20.1%, while gated deliveries showed differences of up to −1.7% for selected diodes.
Conclusion
The motion platform was found to be usable in a 1.5 T magnetic field, and for all MR characterization experiments, no influence from the motion platform was observed. This motion platform enables to perform motion-included QA, with a measurement device of choice.
期刊介绍：
Medical Physics publishes original, high impact physics, imaging science, and engineering research that advances patient diagnosis and therapy through contributions in 1) Basic science developments with high potential for clinical translation 2) Clinical applications of cutting edge engineering and physics innovations 3) Broadly applicable and innovative clinical physics developments
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