Abstract #4057

Endoluminal imaging with MEMS in series with loop coil for active decoupling

Hamza Raki^1,2, Kevin Tse Ve Koon¹, Isabelle Saniour¹, Henri Souchay², Simon A Lambert¹, Fraser Robb³, and Olivier Beuf¹

¹Univ Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, CNRS, Inserm, CREATIS UMR 5220, U1206, F-69100, Lyon, France, ²GE Healthcare, Buc, France, ³GE Healthcare, Aurora, OH, United States

A Receiver-Endoluminal-Coil (REC) integrating an active-decoupling circuit based on MEMS switch in series with the loop (sMEMS) was built and characterized on bench and at 1.5T. The results were compared to a conventional PIN-diode REC. Although the quality factor of sMEMS was significantly lower (34%) than the one of PIN-diode, efficient (|S₁₁|<-0.1dB) and fast (delays<8µs) active-decoupling were obtained for the sMEMS. Obtained MR images display no hyper intensity or artifacts due to active-decoupling failure. SNR-values and SNR-isocontours of sMEMS were similar to those of PIN-diode for GRE and lower for FSE sequences. sMEMS can bring new coil-design possibilities for endoluminal-imaging.

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