Special multichannel radio frequency echo signal down converter for MR-EPT spectrometer

Abstract

The invention discloses a special multichannel radio frequency echo signal down converter for an MR-EPT spectrometer, and belongs to the field of MR-EPT imaging. The down converter comprises a local oscillator signal generation module, a power division module and a frequency-mixing amplitude-modulation phase-modulation unit which are connected in sequence, and a control module for controlling thefrequency of a local oscillator signal output by the local oscillator signal generation module and controlling the frequency-mixing amplitude-modulation phase-modulation unit to adjust the amplitude and phase of an output signal. The frequency mixing amplitude modulation and phase modulation unit comprises a plurality of radio frequency amplitude modulation and phase modulation modules. The radiofrequency amplitude modulation and phase modulation module comprises a radio frequency signal processing module for performing sideband suppression and impedance matching on a radio frequency echo signal, which are connected in sequence; a frequency mixing module used for carrying out frequency mixing on multi-channel local oscillation signals output by the power dividing module and radio frequency signals output by the radio frequency signal processing module, a filtering module, an amplifying module, a phase modulation module controlled by the control module to carry out phase shift, and anamplitude modulation module controlled by the control module to carry out amplitude modulation. The problem that an existing magnetic resonance spectrometer cannot be used for MR-EPT imaging in a 9.4T ultrahigh magnetic field environment is solved.

Description

Technical field [0001] The invention belongs to the field of MR-EPT imaging technology, and relates to a dedicated multi-channel radio frequency echo signal downconverter for MR-EPT spectrometer. Background technique [0002] The magnetic resonance tomography (MR-EPT) technology of the dielectric properties of human tissues is a research hotspot in the field of magnetic resonance that has emerged in recent years. Its main purpose is to study how to obtain the distribution information of the dielectric properties of human tissues (EPS) from MRI medical images. . By detecting the entire physiological process of transforming normal tissues into cancerous tissues, the process of changing its dielectric properties can be obtained, which has a breakthrough value for the early diagnosis of cancer. [0003] The currently proposed MR-EPT imaging of human hydrogen nuclei under a 9.4T ultra-high magnetic field environment has high imaging accuracy and can effectively reflect the distribution...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dedicated multi-channel RF echo signal downconverter for MR-EPT spectrometers, which solves the problem that existing magnetic resonance spectrometers cannot be used for MR-EPT imaging in an ultra-high magnetic field environment of 9.4T The problem

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