Measuring local RF heating in MRI: Simulating perfusion in a perfusionless phantom

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buir.contributor.authorAtalar, Ergin
dc.citation.epage1235en_US
dc.citation.issueNumber5en_US
dc.citation.spage1228en_US
dc.citation.volumeNumber26en_US
dc.contributor.authorAkca, I. B.en_US
dc.contributor.authorFerhanoglu, O.en_US
dc.contributor.authorYeung, C. J.en_US
dc.contributor.authorGuney, S.en_US
dc.contributor.authorTasci, T. O.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T10:12:27Z
dc.date.available2016-02-08T10:12:27Z
dc.date.issued2007en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractPurpose: To overcome conflicting methods of local RF heating measurements by proposing a simple technique for predicting in vivo temperature rise by using a gel phantom experiment. Materials and Methods: In vivo temperature measurements are difficult to conduct reproducibly; fluid phantoms introduce convection, and gel phantom lacks perfusion. In the proposed method the local temperature rise is measured in a gel phantom at a timepoint that the phantom temperature would be equal to the perfused body steady-state temperature value. The idea comes from the fact that the steady-state temperature rise in a perfused body is smaller than the steady-state temperature increase in a perfusionless phantom. Therefore, when measuring the temperature on a phantom there will be the timepoint that corresponds to the perfusion time constant of the body part. Results: The proposed method was tested with several phantom and in vivo experiments. Instead, an overall average of 30.8% error can be given as the amount of underestimation with the proposed method. This error is within the variability of in vivo experiments (45%). Conclusion: With the aid of this reliable temperature rise prediction the amount of power delivered by the scanner can be controlled, enabling safe MRI examinations of patients with implants. © 2007 Wiley-Liss, Inc.en_US
dc.identifier.doi10.1002/jmri.21161en_US
dc.identifier.eissn1522-2586
dc.identifier.issn1053-1807
dc.identifier.urihttp://hdl.handle.net/11693/23341
dc.language.isoEnglishen_US
dc.publisherJohn Wiley & Sons, Inc.en_US
dc.relation.isversionofhttps://doi.org/10.1002/jmri.21161en_US
dc.source.titleJournal of Magnetic Resonance Imagingen_US
dc.subjectRF heatingen_US
dc.subjectMRI safetyen_US
dc.subjectInterventional MRIen_US
dc.subjectMetallic implantsen_US
dc.subjectPerfusionen_US
dc.subjectBioheat equationen_US
dc.titleMeasuring local RF heating in MRI: Simulating perfusion in a perfusionless phantomen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)