A special multi-channel RF echo signal downconverter for mr-ept spectrometer

Abstract

The invention discloses a multi-channel radio frequency echo signal downconverter dedicated to MR-EPT spectrometer, which belongs to the field of MR-EPT imaging, and comprises a local oscillator signal generation module, a power division module and a frequency mixing, amplitude modulation and phase modulation unit connected in sequence, And control the frequency of the local oscillator signal output by the local oscillator signal generation module and the control module that controls the frequency mixing amplitude modulation and phase modulation unit to adjust the output signal amplitude and phase; the frequency mixing amplitude modulation and phase modulation unit includes a plurality of frequency mixing amplitude modulation and phase modulation modules, mixing The frequency modulation amplitude phase modulation module includes a sequentially connected radio frequency signal processing module for suppressing sidebands and impedance matching of radio frequency echo signals, mixing the multi-channel local oscillator signal output by the power division module and the radio frequency signal output by the radio frequency signal processing module The frequency mixing module, the filtering module, the amplifying module, the phase modulation module controlled by the control module for phase shifting and the amplitude modulation module controlled by the control module for amplitude adjustment. The invention solves the problem that the existing magnetic resonance spectrometer cannot be used for MR-EPT imaging in an ultra-high magnetic field environment of 9.4T.

Description

technical field

[0001] The invention belongs to the technical field of MR-EPT imaging, and relates to a special multi-channel radio frequency echo signal down-converter for MR-EPT spectrometers. Background technique

[0002] Magnetic resonance tomography (MR-EPT) technology of human tissue dielectric properties 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 human tissue dielectric properties (EPS) from MRI medical images. . By detecting the entire physiological change process of normal tissue into cancerous tissue, the change process of 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 in a 9.4T ultra-high magnetic field environment has high imaging accuracy and can effectively reflect the distribution characteristics of the die...

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