An MRI equipment main magnet uniformity detection and analysis device and method thereof

Abstract

The invention discloses a uniformity detection analysis device and method of an MRI equipment main magnet. The device is in a way that M magnetic field detection probes are driven by a magnetic fieldanalysis module, the magnetic field analysis module comprises a singlechip microcomputer, an AD conversion circuit, a signal conditioning circuit, a power circuit, a probe control circuit, a control keyboard and a liquid crystal screen, the probe control circuit comprises a data selector MUXS, two latches L1 and L2 and a reverse-phase encoder, the arbitrary i(th) magnetic field probe comprises N Hall components and two data selectors, the N Hall components are arranged in J lines and K rows, a VCC end of the arbitrary j(th) Hall components is connected in parallel with a j(th) passage of a data selector MUXA-i, and output ends of the arbitrary k(th) lines of Hall components are connected in parallel with a k(th) passage of a data selector MUXB-i. By the device, the uniformity of the MRI equipment main magnet can be effectively detected, and a reference index is provided for design of a shim coil.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and specifically designs a device for detecting and analyzing the uniformity of a main magnet of MRI equipment, which provides design reference for the shimming work of the main magnet of magnetic resonance. Background technique [0002] In magnetic resonance imaging equipment, the role of the main magnet is to provide a static magnetic field B 0 , the more common main magnets include permanent magnet, coil and superconducting. No matter what kind of main magnet is used, due to the influence of manufacturing process errors and surrounding environment and other factors, the actual static magnetic field generated by the main magnet is compared with the theoretical one. There is a certain error in the design, and it is not an ideal uniform magnetic field. The uniformity of the static magnetic field is closely related to the quality of the magnetic resonance image, so there are strict requi...

AI Technical Summary

Problems solved by technology

Usually, the detection of the uniformity of the magnetic field requires the combination of a common Gauss meter and a fixed fixture to measure the magnetic field strength point by point. This method requires multiple adjustments of the positions of the Gauss meter and the fixture, and frequent data recording, and the operation process is relatively complicated.

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