Design of a Parallel High-Speed Receiving System

Abstract

Abstract:

In this paper, a compact and flexible signal receiving system mainly designed for low-field MRI systems is presented, which is capable of sampling multi-channel magnetic resonance signals simultaneously at a high speed and demodulating them directly. A digital down conversion chip (AD6636) was used to demodulate and decimate the signals from the four channels in a quadrature way. Digital signal processing (DSP) methods were used to complete the configuration of AD6636 and read out the I/Q data either from all channels at once, or just from one channel of interest. The sampling speed of the system could reach 100 million samples per second, giving high signal-to-noise. The system can be applied in MRI system with magnetic field strength up to 1 T. The performance of the signal receiving system was demonstrated by experimental results.

Key words: magnetic resonance imaging, multi-channel, digital down conversion, AD6636

CLC Number:

O482.53

YAN Zheng, ZHAO Wu-Yi, WANG Hui-Xian, HU Li-Li, YANG Wen-Hui. Design of a Parallel High-Speed Receiving System[J]. Chinese Journal of Magnetic Resonance, 2011, 28(2): 198-206.

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