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Abstract #2709

A technique to compensate signal loss in an RF switch matrix system in MRI

Yun-Kyoung Ko1, Han Lim Lee2, Chang-Hoon Choi1, and N. Jon Shah1,3

1Institute of Neuroscience and Medicine - 4, Forschungszentrum Juelich, Juelich, Germany, 2School of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea, Republic of, 3Faculty of Medicine, Department of Neurology, JARA, RWTH Aachen University, Aachen, Germany

MRI RF channels refer to the pathways of received signals and the availability of multiple channels allows one to access multi-channel array coils. To control the use of different coils, MRI usually utilises a crossbar-type switch matrix system that interactively connects the selected coil as an input and corresponding analogue-to-digital converters as an output. However, since the RF wavelength decreases with increasing B0, impedance in RF pathways varies in accordance with wavelength. This results in signal loss and in degraded image quality. In this study, we proposed an RF loss compensation technique for the switch matrix and verified its performance.

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