Reduction of implant RF heating through modification of transmit coil electric field

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buir.contributor.authorAtalar, Ergin
dc.citation.epage1313en_US
dc.citation.issueNumber5en_US
dc.citation.spage1305en_US
dc.citation.volumeNumber65en_US
dc.contributor.authorEryaman, Y.en_US
dc.contributor.authorAkin, B.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T09:53:23Z
dc.date.available2016-02-08T09:53:23Z
dc.date.issued2010-12-08en_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractIn this work, we demonstrate the possibility to modify the electric-field distribution of a radio frequency (RF) coil to generate electric field-free zones in the body without significantly altering the transmit sensitivity. Because implant heating is directly related to the electric-field distribution, implant-friendly RF transmit coils can be obtained by this approach. We propose a linear birdcage transmit coil with a zero electric-field plane as an example of such implant-friendly coils. When the zero electric-field plane coincides with the implant position, implant heating is reduced, as we demonstrated by the phantom experiments. By feeding RF pulses with identical phases and shapes but different amplitudes to the two orthogonal ports of the coil, the position of the zero electric-field plane can also be adjusted. Although implant heating is reduced with this method, a linear birdcage coil results in a whole-volume average specific absorption rate that is twice that of a quadrature birdcage coil. To solve this issue, we propose alternative methods to design implant-friendly RF coils with optimized electromagnetic fields and reduced whole-volume average specific absorption rate. With these methods, the transmit field was modified to reduce RF heating of implants and obtain uniform transmit sensitivity.en_US
dc.identifier.doi10.1002/mrm.22724en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/21944
dc.language.isoEnglishen_US
dc.publisherWILEYen_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/mrm.22724en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectImplant heatingen_US
dc.subjectRF heatingen_US
dc.subjectSafety of MRIen_US
dc.titleReduction of implant RF heating through modification of transmit coil electric fielden_US
dc.typeArticleen_US

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