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Magnetic resonance main magnet magnetic field uniformity detection method

A technology for magnetic field uniformity and detection methods, applied in magnetic resonance measurement, magnetic field size/direction, complex mathematical operations, etc., can solve problems such as image artifacts, inaccurate results, etc., to improve accuracy, simplify operation procedures, improve efficiency effect

Pending Publication Date: 2022-08-05
SHENZHEN ACAD OF AEROSPACE TECH +5
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Problems solved by technology

The uniformity of the magnetic field determines the quality of the magnetic resonance image to a large extent, and the uneven magnetic field will cause serious artifacts in the image, resulting in inaccurate results

Method used

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  • Magnetic resonance main magnet magnetic field uniformity detection method
  • Magnetic resonance main magnet magnetic field uniformity detection method
  • Magnetic resonance main magnet magnetic field uniformity detection method

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Embodiment Construction

[0049] The following examples are further explanations and explanations of the present invention, which does not constitute any restrictions on the invention.

[0050] like figure 1 As well as figure 2 Show, the method of the present invention is achieved by a few magnetic field detection sensor 10 on the supporting body 20 of the RF receiving coil. In this embodiment, multiple magnetic field detection sensors are set at the periphery of the RF receiving coil to measure the magnetic field data at the corresponding location. The magnetic field detection sensor 10 is set on the supporting body 20 of the RF receiving coil. The support body can be an empty cylindrical or spherical or arc. In this embodiment, the supporting body is an empty cylindrical body. Multiple magnetic field detection sensors 10 surround the support body interval in different positions in the side wall. Each sensor can collect magnetic field data at the same time, which improves measurement efficiency. like imag...

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Abstract

A magnetic resonance main magnet magnetic field uniformity detection method comprises the following steps that a, a plurality of magnetic field detection sensors wrapped with shielding layers are arranged on the periphery of a radio frequency receiving coil and used for measuring static magnetic fields at the positions where the sensors are located; b, setting spatial position coordinates of each magnetic field detection sensor; c, setting a magnetic resonance center frequency correction program; d, performing Legendre polynomial expansion on the measured main magnetic field distribution of the imaging area under a spherical coordinate system to obtain a spherical harmonic function expression of actual magnetic field distribution; e, solving constant coefficients before each item in the expression; and f, respectively importing the coordinates of each coordinate point in the target area of which the uniformity is to be evaluated into the expression to obtain corresponding magnetic field distribution, a magnetic field distribution rule in the target area and a uniformity distribution rule of the magnetic field. The method can measure the magnetic field intensity of multiple positions in different planes in the effective area of the magnetic resonance equipment, and can effectively improve the uniformity detection efficiency of the magnetic resonance main magnet.

Description

【Technical Field】 [0001] The invention involves the field of magnetic resonance technology for medical diagnosis, especially the detection method of a magnetic resonance main magnetic field. 【Background technique】 [0002] As one of the important medical imaging technologies, magnetic resonance imaging is widely used in many fields such as scientific research and clinical medicine with its high space resolution and good spatial positioning. In the magnetic resonance imaging system, the uniformity of the main magnetic field is an important indicator. The uniformity of the magnetic field determines the quality of the magnetic resonance image to a large extent. The uneven magnetic field will cause serious pseudohados on the image, which will cause the results to be inaccurate. As an important indicator of magnetic field uniformity, whether the experimental results and some high -dependent uniform sequences can correctly achieve a key role. In order to obtain more accurate data, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/24G06F17/11G06F17/16
CPCG01R33/24G06F17/11G06F17/16
Inventor 吴嘉敏贺玉成徐征何为廖英翔
Owner SHENZHEN ACAD OF AEROSPACE TECH
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