Direct optical measurement of the RF electrical field for MRI
Isabelle Saniour1, Anne-Laure Perrier2, Gwenaël Gaborit2,3, Jean Dahdah3, Lionel Duvillaret3, and Olivier Beuf1
1CREATIS, Université de Lyon ; CNRS UMR5220 ; Inserm U1044 ; INSA-Lyon ; Université Claude Bernard Lyon 1, Villeurbanne, France, 2IMEP-LAHC, UMR 5130 ; Université de Savoie, Le Bourget-du-Lac, France, 3Kapteos, Sainte-Hélène du Lac, France
In MRI, a
real time monitoring of the magnitude of the electric field prevents the
patient from safety hazards due to heating phenomenon. A sub-cm electro-optical
probe was used to localize and measure the E-field in 4.7-T MRI. This probe is
formed from an electro-optic crystal that changes its refractive indexes
according to the applied E-field. The results show that the probe is non-perturbative
regarding the E-field and does not affect the quality of MR images. Six clear E-field
concentrations were localized at proximal and distal sides of the transceiver
coil. Their magnitudes vary between 10000V/m and 20000V/m.
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