Tilting plane echo imaging method and nuclear magnetic resonance imaging system
A technology of echo imaging and inclined planes, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of low image quality, improve image quality, eliminate artifacts, and reduce the influence of gradient channel asymmetry Effect
Active Publication Date: 2019-05-14
ALLTECH MEDICAL SYST
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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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[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] Such as 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 ...
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The invention relates to a tilting plane echo imaging method and a nuclear magnetic resonance imaging system. The tilting plane echo imaging method comprises the following steps that 1, a rotation matrix R of a scanning layer surface is obtained, and a rotation angle theta in an imaging plane is calculated; 2, a gradient projection matrix T without rotation in the plane is calculated; 3, the gradient projection matrix T is used for controlling a gradient to complete scanning; 4, data is collected, and an image M' is rebuilt; and 5, the image M' is rotated by theta angle, and an image M is obtained. According to the tilting plane echo imaging method and the nuclear magnetic resonance imaging system, the influence of a gradient channel asymmetry can be reduced, so that artifacts brought by the gradient channel asymmetry in tilting plane echo imaging are effectively reduced, and the quality of the image is improved; and after the data is collected and the image is rebuilt, the image is rotated to a preset angle, and thus, a dissection section required by a doctor is ensured.
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...
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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