CMOS frequency division multiplexer enables multi-channel magnetic resonance imaging with a single channel spectrometer
Conference: MikroSystemTechnik 2015 - MikroSystemTechnik Kongress 2015
10/26/2015 - 10/28/2015 at Karlsruhe, Deutschland
Proceedings: MikroSystemTechnik 2015
Pages: 4Language: englishTyp: PDF
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Authors:
Jouda, M.; Gruschke, O. G.; Korvink, J. G. (Institute for Microstructure Technology-IMT, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Deutschland)
Fischer, E.; Leupold, J.; Elverfeldt, D.; Hennig, J. (Department of Radiology, University Medical Center Freiburg, 79106 Freiburg, Deutschland)
Abstract:
In this paper we report on the results of a magnetic resonance imaging (MRI) experiment that employs a CMOS frequency division multiplexer (FDM). The multiplexer, which was presented in a previous publication of the authors, was first utilized to acquire the MR free induction decay (FID) of a water sample in an 11.7 T (500 MHz Larmor frequency of 1H protons) scanner. After that, the CMOS FDM was involved in an imaging experiment in a 9.4 T (400 MHz) Bruker magnet. A UHFLI lock-in amplifier from Zurich Instruments was employed to digitize and record the MR echo signals from the chip. The recorded signals were processed in Matlab to reconstruct the MR image. The image from the CMOS chip was successfully obtained and showed a very good resemblance to the original image obtained from the scanner, and thus confirms the utility of the FDM as a promising remedy to overcome the size, cost, and complexity issues associated with the MR phased arrays.