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Oblique Plane Echo Imaging Method and Magnetic Resonance Imaging System

A nuclear magnetic resonance imaging and echo imaging technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problem of low image quality, achieve the effect of improving image quality, eliminating artifacts, and reducing the impact of asymmetry

Active Publication Date: 2021-10-29
ALLTECH MEDICAL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these corrections only slightly improve the asymmetry of the gradient channel
Therefore, the image quality of inclined echo-planar imaging is always significantly lower than that of non-tilted echo-planar imaging

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  • Oblique Plane Echo Imaging Method and Magnetic Resonance Imaging System
  • Oblique Plane Echo Imaging Method and Magnetic Resonance Imaging System
  • Oblique Plane Echo Imaging Method and Magnetic Resonance Imaging System

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052] like figure 1 The nuclear magnetic resonance imaging system disclosed in the present invention includes a magnetic resonance scanning control workstation, a magnetic resonance spectrometer, a gradient amplifier and a magnetic resonance scanner; the magnetic resonance scanner includes a magnet, a gradient coil and a receiving coil. Wherein, the gradient amplifier is driven by the gradient command output by the magnetic resonance spectrometer.

[0053] Magnetic resonance scanning control workstation: used to obtain the scanning layer rotation matrix R, the rotation angle θ in the imaging plane and the gradient projection matrix T, and to display images;

[0054] Magnetic resonance spectrometer: Calculate the output waveform corresponding to each gradient cha...

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Abstract

The present invention relates to an oblique plane echo imaging method and a nuclear magnetic resonance imaging system, comprising the following steps: step 1, obtaining a scanning layer rotation matrix R, and calculating the rotation angle θ in the imaging plane; step 2, calculating a gradient projection matrix without rotation in the plane T; step 3, use the gradient projection matrix T to control the gradient to complete the scan; step 4, collect data, and reconstruct the image M'; step 5, rotate the image M' by an angle θ to obtain the image M. The present invention can reduce the influence of gradient channel asymmetry, and then effectively reduce the artifacts caused by gradient channel asymmetry in inclined plane echo imaging, thereby improving image quality; after collecting data and reconstructing an image, the image is rotated To the preset angle, this guarantees the anatomical section required by the doctor.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance imaging, in particular to an inclined plane echo imaging method and a nuclear magnetic resonance imaging system. Background technique [0002] Echo Planar Imaging (EPI) is one of the fastest MRI methods so far. Echo-planar imaging is a special form of gradient echo imaging, which uses fast reverse gradients to generate a series of gradient echoes within a single repetition time (TR) and encodes them in phase, filling them into the corresponding k-space, realizing Sectional imaging. Echo planar imaging has been widely used in diffusion weighted imaging (DWI), functional brain MRI (fMRI), cerebral perfusion imaging (PWI), arterial spin labeling (ASL) and so on. [0003] However, the EPI technique is susceptible to inherent imperfections of magnetic resonance systems. For example, echo-planar technology uses readout gradients of alternating polarity, due to B0 field inhomogeneit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/561
Inventor 罗海王文周黄攀周翔朱高杰王超陈梅泞吕蓓吴子岳
Owner ALLTECH MEDICAL SYST