Method and apparatus for determining inversion recovery time in magnetic resonance imaging
An inversion recovery and magnetic resonance technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems of inaccurate inversion recovery time, manual search, etc., and achieve the effect of accurate inversion recovery time.
Active Publication Date: 2018-08-03
SHANGHAI UNITED IMAGING HEALTHCARE
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[0004] The problem to be solved by the present invention is that when performing magnetic resonance scanning, it is necessary to manually search for the inversion recovery time, and the found inversion recovery time is inaccurate
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[0032] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.
[0034] figure 2 It is a schematic flowchart of the method for determining the inversion recovery time in the magnetic resonance examination of the present invention.
[0035] Please refer to figure 1 , as described in step a, multiple pre-scans are performed to obtain multiple preliminary images before the formal scan of the inspection object, and the inversion recovery time of the pulse sequence corresponding to each pr...
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The invention provides a method for determining inversion recovery time in magnetic resonance imaging. The method comprises the steps that before an inspected object is scanned formally, multiple times of pre-scanning is carried out to obtain multiple initial images, and inversion recovery time of an impulse sequence corresponding to each time of pre-scanning is different from that of other impulse sequences; a sampling value is obtained through each initial image, and the sampling values are mean gray values or gray level quadratic sum; the minimum sampling value is determined from the multiple obtained sampling values, and the inversion recovery time corresponding to the minimum sampling value is the best inversion recovery time. According to the method, the best inversion recovery time is searched for according to signal changing conditions of a region of interest in magnetic resonance images, the problem that the inversion recovery time is manually searched for in existing workflow is solved, time is saved, and the inversion recovery time which is searched is more accurate.
Description
technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a method and device for determining inversion recovery time in magnetic resonance imaging. Background technique [0002] The inversion recovery sequence is based on the difference in the longitudinal relaxation time (T1) of the two tissues (or components), such as figure 1 Composition A and composition B shown, before the main sequence, a 180° RF pulse is used to reverse the magnetization vector to its opposite direction. Due to the different relaxation speeds, the magnetization vectors of the two components will recover at different times to 0, and then continue to recover in the positive direction. When the magnetization vector of one of the components returns to 0, the sequence of excitation pulses can achieve the effect of suppressing the component, because only the magnetization vector that is not 0 is excited at this time. This approach has a very good ...
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IPC IPC(8): A61B5/055
CPCA61B5/055A61B5/7282
Inventor 王振奎刘铭湖
Owner SHANGHAI UNITED IMAGING HEALTHCARE