A near-field receiving device for improving the signal-to-noise ratio of magnetic resonance

Abstract

The invention discloses a near-field receiving device for improving the signal-to-noise ratio of magnetic resonance, comprising a synchronous clock reference circuit, an ADC sampling clock stabilization circuit, a switching ripple frequency control circuit of a switching power supply, and an ADC sampling circuit; the synchronous clock reference circuit includes a photoelectric Conversion unit, clock recovery unit, clock shaping unit, reference clock selection unit; ADC sampling clock stabilization circuit includes a phase-locked loop chip and a voltage-controlled crystal oscillator working with the phase-locked loop chip; the switching ripple frequency control circuit of the switching power supply includes dividers and switching power supplies. The present invention provides two remote transmission schemes for synchronous reference clocks, which synchronize the synchronous reference clock signal transmitted from the main system to the near-field receiver with the sampling clock of the analog-to-digital converter; The synchronous reference clock signal of the receiver is dejittered, which can improve the signal-to-noise ratio of the ADC and the near-field receiver.

Description

technical field [0001] The invention belongs to the technical field of electronic information, in particular to a near-field receiving device for improving the signal-to-noise ratio of magnetic resonance. Background technique [0002] Obtaining high-quality nuclear magnetic resonance (MRI) images has always been the goal pursued by the field of magnetic resonance, and the image signal-to-noise ratio (SNR) is an important indicator to measure the quality of MRI images. It can be said that the key technologies applied to MRI systems are In order to meet the user's requirements for the SNR of the MRI system. According to the principle of nuclear magnetic resonance imaging, we can easily imagine that the image signal-to-noise ratio can be improved by selecting scanning parameters. Equation (1) gives the relationship between image signal-to-noise ratio and relevant scanning parameters. [0003] [0004] In the formula, K represents the clinical imaging environment and its pa...

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Problems solved by technology

[0014] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a long-distance transmission scheme through two kinds of synchronous reference clocks, and to phase the synchronous reference clock signal transmitted from the main system to the near-field receiver with the sampling clock of the analog-to-digital converter Synchronization, a near-field receiving device that solves the problem of clock synchronization between the near-field receiver and the main system transmitter and improves the magnetic resonance signal-to-noise ratio

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