A high-temperature superconducting shimming system applied to magnetic resonance equipment

Abstract

The invention discloses a high-temperature superconducting shimming system applied to magnetic resonance equipment, comprising: a high-temperature superconducting shimming coil, a mutual induction coil, a switch controller, a high-frequency signal generator and a bridge rectifier circuit; The AC current is input from the side of the normal temperature area, and the induced current is generated by the low temperature area side of the mutual induction coil; the induced current is rectified through the bridge rectifier circuit; inside the bridge rectifier circuit, the high frequency signal generator generates a high frequency current signal and inputs it to the switch The controller controls the on-off of the superconducting switch in the bridge rectifier circuit through the switch controller; after rectification, the induced current becomes direct current and is input into the high-temperature superconducting shim coil; when the external AC power signal is removed, the bridge rectifier circuit remains The two opposite superconducting switches are turned on, and the high-temperature superconducting shimming system is in a closed-loop operation state. The invention can enhance the shimming effect, improve the uniformity of the magnetic field, reduce the consumption of liquid helium, save resources and reduce costs.

Description

technical field [0001] The invention relates to the field of magnetic resonance, in particular to a high-temperature superconducting shimming system applied in magnetic resonance equipment. Background technique [0002] With the development of magnetic resonance imaging technology, superconducting magnetic resonance has gradually become the mainstream in the field of magnetic resonance because of its excellent stability and uniformity, and has very broad prospects in scientific research and other fields. Among them, the superconducting main magnet is the main component of superconducting magnetic resonance. The magnetic field strength and uniformity are the main indicators to measure its performance, especially the magnetic field uniformity can not only determine the performance of the magnet, but also directly affect the signal-to-noise ratio of the image. But even if the magnet design calculation is very precise, its processing error is unavoidable. In practice, the magne...

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problems of insufficient on-off speed, inaccurate control process, thermal influence, and shut-off magnetic field influence of the traditional superconducting magnetic resonance shimming system, and proposes a high-temperature superconducting shimming system applied to magnetic resonance equipment , in order to improve the shimming effect, improve the uniformity of the magnetic field, and at the same time reduce the amount of liquid helium used, save resources and reduce costs

Images