Abstract #2212

Direct optical measurement of the RF electrical field for MRI

Isabelle Saniour¹, Anne-Laure Perrier², Gwenaël Gaborit^2,3, 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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