Improving RF safety in MRI by modifying the electric field distribution

Yigitcan Eryaman, Ergin Atalar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In 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.

Original languageEnglish (US)
Title of host publication2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011
DOIs
StatePublished - Nov 21 2011
Event2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 - Istanbul, Turkey
Duration: Aug 13 2011Aug 20 2011

Publication series

Name2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011

Other

Other2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011
CountryTurkey
CityIstanbul
Period8/13/118/20/11

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