| Installation of the 1.5 T MRI accelerator next to clinical accelerators: impact of the fringe field. | |
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MedLine Citation:
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PMID: 19687566 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In the UMC Utrecht a prototype MRI accelerator has been installed to investigate the feasibility of real-time, MRI guided radiotherapy. The system consists of a 6 MV Elekta (Crawley, UK) accelerator and a 1.5 T Philips (Best, The Netherlands) MRI system. The system is installed in a standard radiotherapy bunker. The bunker is at the corner of a block of six bunkers, so there are three neighbouring clinical Elekta accelerators. During ramping of the magnet, the magnetic fringe field in the two nearest bunkers was measured as a function of the magnetic field strength of the MRI magnet. At 8 m, a maximum increase of 1.5 G was measured, at 12 m, 0.6 G. This is up to three times the earth's magnetic field. The clinical accelerators are needed to be re-calibrated in order to operate in such an external magnetic field. The resulting radiation field flatness of the clinical accelerators was measured and was similar to the situation before ramping the magnet. |
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Authors:
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J G M Kok; B W Raaymakers; J J W Lagendijk; J Overweg; C H W de Graaff; K J Brown |
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Publication Detail:
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Type: Evaluation Studies; Journal Article Date: 2009-08-18 |
Journal Detail:
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Title: Physics in medicine and biology Volume: 54 ISSN: 0031-9155 ISO Abbreviation: - Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-09-02 Completed Date: 2009-11-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401220 Medline TA: Phys Med Biol Country: England |
Other Details:
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Languages: eng Pagination: N409-15 Citation Subset: IM |
Affiliation:
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Department of Radiotherapy, University Medical Center Utrecht, Heidelberglaan 100, Utrecht 3584 CX, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Electromagnetic Fields Equipment Design Equipment Failure Analysis Image Interpretation, Computer-Assisted* Magnetic Resonance Imaging / instrumentation* Particle Accelerators / instrumentation* Reproducibility of Results Sensitivity and Specificity |
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