TY - GEN
T1 - Improving RF safety in MRI by modifying the electric field distribution
AU - Eryaman, Yigitcan
AU - Atalar, Ergin
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=81255201444&partnerID=8YFLogxK
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U2 - 10.1109/URSIGASS.2011.6051330
DO - 10.1109/URSIGASS.2011.6051330
M3 - Conference contribution
AN - SCOPUS:81255201444
SN - 9781424451173
T3 - 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011
BT - 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011
T2 - 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011
Y2 - 13 August 2011 through 20 August 2011
ER -