Design and Characterization of a Multi-channel Data Acquisition System for Magnetic Resonance Imaging

Rasheed, Sarbast and So, Simon and Vu, Linda and Hajian, Arsen (2016) Design and Characterization of a Multi-channel Data Acquisition System for Magnetic Resonance Imaging. Magnetic Resonance Imaging. ISSN 0730-725X (In Press)

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Abstract

In this paper, we present a data acquisition and image reconstruction technique for magnetic resonance imaging (MRI). It spectrally separates the broadband magnetic resonance (MR) signal into multiple narrowband channels before digitization; then after processing each channel signal individually it recombines the frequency-limited narrowband signals from the separate channels to reconstruct images or signal profiles. First, the incoming broadband radio frequency (RF) raw MR signal is demodulated and down-converted into a lower frequency using a custom RF receiver chain and then de-multiplexed into multiple narrow frequency bands using a bank of active analog bandpass filters. The signal from each narrowband channel is independently captured, amplified, filtered, and then digitized. From each channel signal, an intermediate image is derived. The final image is reconstructed by recombining all the channels data via weighted addition, where the weights correspond to the frequency responses of each narrowband filter. The developed technique offers increases in signal-to-noise ratio (SNR) and increases in dynamic range over MRI traditional methods. Also the free induction decay (FID) signal echoes in the developed system experience a slower decay rate.

Item Type: Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Depositing User: Dr. Sarbast Rasheed
Date Deposited: 29 Aug 2016 08:04
Last Modified: 29 Aug 2016 08:04
URI: http://eprints.auis.edu.krd/id/eprint/60

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