Magnetic resonance imaging equipment and shimming method thereof

Abstract

The present invention relates to the technical field of magnetic resonance imaging, in particular to a magnetic resonance imaging device, comprising a main magnet, a gradient coil, and a vacuum cover; the main magnet is provided with a storage cavity extending along its axial direction, and the gradient coil is installed in the storage cavity The vacuum outer cover is used to cover the gradient coil; the vacuum outer cover is provided with a shimming pipe for placing shimming strips, and the inside of the shimming pipe is communicated with the outside atmosphere; the space in the vacuum outer cover except the inside of the shim pipe can be be sealed. In this magnetic resonance imaging equipment, the gradient coil is completely enclosed in the vacuum housing. Before the equipment is shipped to customers, the space in the vacuum housing except the inside of the shimming pipeline can be evacuated to ensure that the gradient coil is in a vacuum environment. After the equipment is sent to the customer, the shimming strip can be directly put into the magnetic field of the equipment through the shimming pipeline for shimming, so that the shimming operation can be performed at any time without destroying the vacuum environment, making the equipment more convenient to use.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a magnetic resonance imaging device and a shimming method thereof. Background technique [0002] In conventional magnetic resonance imaging (MRI) equipment, gradient coils are located within the main magnetic field. Since there is an alternating current in the gradient coil, according to the left-hand law of electromagnetism, the energized wire in the gradient coil is affected by the Lorentz force. When the current changes sharply, the force on the wire in the gradient coil also changes accordingly, resulting in severe vibration, which is the reason for the noise generated by the gradient switching. In an MRI system, noise can propagate in two main ways: through the air and through structural components. In the air-borne path, the air adjacent to the gradient coils will vibrate and propagate the vibrations to adjacent components such as the housing. In the t...

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Problems solved by technology

[0005] Based on this, it is necessary to address the problem that traditional magnetic resonance equipment cannot perform shimming in a vacuum state, and provide a magnetic resonance imaging equipment that can perform on-site shimming without destroying the vacuum environment, and also provides a Shimming Method for Magnetic Resonance Imaging Equipment

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