Magnetic nuclear resonance radio frequency receiving signal digital downward conversion implementing device and method

Abstract

The invention relates to a device and a method for realizing the nuclear magnetic resonance radio frequency received signal digital down conversion, which are realized on the basis of the FPGA technology, the device comprises a DC-offset suppressor, a command decoder, a numerical controlled oscillator, a real part channel, an imaginary part channel and an output control interface, wherein, the DC-offset suppressor suppresses the DC-offset which is generated during the digital signal processing process; the command decoder decodes control words of the numerical controlled oscillator, the related control words of a CIC comb filter and the control words of a DDC output in a real-time manner; the numerical controlled oscillator decodes the control words of the numerical controlled oscillator in the real-time manner; the real part channel and the imaginary part channel complete the orthogonal detection operation of a digital nuclear magnetic resonance free induction decay signal from the radio frequency signal to the baseband signal; and the output control interface realizes the data communication with a follow-up digital signal processing module or a data memory. The device has strongpracticability and can be flexibly updated according to user needs, thereby avoiding the crises that the whole product can not be continued or the production of the whole product is stopped due to the termination of the life cycle of key components, etc.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance, in particular to a device and method for realizing digital down-conversion of nuclear magnetic resonance radio frequency receiving signals. Background technique [0002] DDC (Digital Down Converter) is the core module of the radio frequency receiving part in the MRI scanning control system, responsible for demodulation of the digital FID (Free Induced Decay) free induction attenuation signal, down data rate conversion, digital filtering, etc. The function is directly related to the SNR (Signal-to-Noise-Rate) of the MRI image. At the same time, DDC digital down converter is also the core device of modern communication system, which undertakes the post-processing function of digital communication signal. [0003] Most of the digital down-converters in traditional MRI scanning control systems and the digital signal receiving and processing in current digital communication systems...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the digital down-conversion method of the nuclear magnetic resonance radio frequency receiving signal in the prior art cannot realize the real-time conversion of variable data, the technical problem to be solved by the present invention is to provide a digital digital conversion method of the nuclear magnetic resonance radio frequency receiving signal based on Altera FPGA technology. Device and method for realizing down-conversion

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