An FPGA-Based Single-Chip Gradient Calculation Module for Magnetic Resonance Imaging

Abstract

Abstract:

A versatile digital gradient calculation module with high integration level was developed for magnetic resonance imaging. Based on a single field programmable gate array (FPGA) system, this apparatus operates real-time calculations of the gradient waveforms for oblique acquisition and preemphasis with a 16-bit parallel interface. Gradient profiles from the G_X, G_Y and G_Z channels are stored in the FPGA embedded memory blocks, and loaded via the parallel interface. High-performance digital waveform preemphasis is achieved by iteratively implementing a scattered lookahead algorithm for compensation of eddy currents. The system has the merits of high reliability, good universality, small size and low cost, providing a compact and flexible scheme for gradient waveform generation.

Key words: MRI, gradient calculation module, field programmable gate array, waveform preemphasis

CLC Number:

R445.2

XIAO Liang, TANG Wei-Nan, WANG Wei-Min. An FPGA-Based Single-Chip Gradient Calculation Module for Magnetic Resonance Imaging[J]. Chinese Journal of Magnetic Resonance, 2010, 27(2): 163-171.

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