Improving RF safety in MRI by modifying the electric field distribution

dc.contributor.authorEryaman, Yiğitcanen_US
dc.contributor.authorAtalar, Erginen_US
dc.coverage.spatialIstanbul, Turkeyen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.descriptionDate of Conference: 13-20 Aug. 2011en_US
dc.description.abstractIn this work we demonstrate that the radiofrequency (RF) electric field in magnetic resonance imaging (MRI) can be modified in order to enhance patient safety. The heating of metallic devices in MRI is directly related to electric field distribution. On the other hand the MR image homogeneity is related to forward polarized component of the magnetic field (transmit sensitivity). In order to prevent heating, electric field-free zones should be generated in the body without significantly altering the transmit sensitivity. For this purpose the linearly polarized birdcage coil is proposed as a metallic device friendly MRI coil. The zero electric field plane of the linear birdcage coil is coincided with the location of the metallic device and the heating is reduced as shown by simulations and experiments. One disadvantage of this approach is, the linear coils generate twice as much whole body average SAR when compared to quadrature birdcage coils. In order to solve this problem simulations are performed to find electromagnetic field solutions with reduced average SAR and uniform transmit sensitivity. © 2011 IEEE.en_US
dc.source.title2011 XXXth URSI General Assembly and Scientific Symposiumen_US
dc.subjectElectric field distributionsen_US
dc.subjectLinearly polarizeden_US
dc.subjectMetallic devicesen_US
dc.subjectMR imagesen_US
dc.subjectPatient safetyen_US
dc.subjectPolarized componentsen_US
dc.subjectRadio frequenciesen_US
dc.subjectWhole bodyen_US
dc.subjectElectric fieldsen_US
dc.subjectElectromagnetic fieldsen_US
dc.subjectMagnetic fieldsen_US
dc.subjectMagnetic resonance imagingen_US
dc.titleImproving RF safety in MRI by modifying the electric field distributionen_US
dc.typeConference Paperen_US
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