A Low-Field Magnetic Resonance Signal Transmission and Reception Processing Platform

TL;DR

This paper introduces an FPGA-based platform for MRI signal transmission and reception tailored for low-field MRI, with adaptable design for mid- and high-field systems, enhancing flexibility and accessibility in MRI spectrometer development.

Contribution

The platform uses DDS technology and digital processing techniques, providing a flexible, accessible, and adaptable solution for MRI signal handling across different field strengths.

Findings

Successful experimental validation of the platform

Flexible RF pulse generation with DDS technology

Potential for adaptation to various MRI field strengths

Abstract

In magnetic resonance imaging (MRI), the spectrometer is a fundamental component of MRI systems, responsible for the transmission of radiofrequency (RF) pulses that excite hydrogen nuclei and the subsequent acquisition of MR signals for processing. However, detailed knowledge about this component remains largely inaccessible due to the proprietary nature of commercial systems. To address this gap, we present an FPGA-based platform specifically designed for MRI signal transmission and reception in low-field MRI applications. Additionally, with appropriate chip replacements, this platform can be adapted for use in mid- and high-field MRI systems. This platform leverages Direct Digital Synthesis (DDS) technology to generate RF pulses, offering the flexibility to quickly and precisely adjust soft pulse parameters to meet the specific requirements of the MRI system. Additionally, the platform processes MRI signals through digital downconversion techniques and utilizes CIC and FIR filters to obtain baseband signals. Experimental testing of this platform has yielded promising results. We hope that this work will inspire further research and development in the field of MRI spectrometer design. Furthermore, it is worth noting that with the replacement of relevant chips, this system can also be adapted for use in mid- and high-field MRI systems.