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Self-adaptive fat suppression pulse parameter selecting method and device

A pulse parameter, self-adaptive technology, applied in applications, medical science, magnetic resonance measurement, etc., can solve the problems of poor universality, difficult to meet the needs of fat reduction, and achieve the effect of improving fat reduction effect and good universality.

Inactive Publication Date: 2016-11-23
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in clinical imaging, different patients and different scanning parts will lead to changes in the spectral peak distribution of water signals and fat signals. Only one set or groups of fixed parameters are not universally applicable, and it is difficult to satisfy all Fat pressing requirements in scanning scenarios

Method used

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  • Self-adaptive fat suppression pulse parameter selecting method and device
  • Self-adaptive fat suppression pulse parameter selecting method and device
  • Self-adaptive fat suppression pulse parameter selecting method and device

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Embodiment 1

[0046] The fat pressing pulse parameter selection process of this embodiment is performed during the calibration phase of the magnetic resonance scan. In this embodiment, when performing the S01 pre-scanning step, the pre-scanning sequence consists of a fat-pressing module 1 (the fat-pressing module 1 is composed of a layer-selected frequency-selective excitation pulse and a phase gradient) and a stimulated echo acquisition sequence. (Stimulated echo acquisition mode, referred to as STEAM sequence) 2 components, the timing diagram is as follows figure 2As shown, it should be noted that although the present invention only uses the sequence composed of the fat-pressing module 1 and the STEAM sequence 2 as the pre-scanning sequence in the S01 step, this sequence is not intended to limit the present invention Scope of protection, those skilled in the art should easily think that the pre-scanning sequence for the S01 step can also be composed of a fat-pressing module and other acq...

Embodiment 2

[0054] Execute S01 pre-scanning, the pre-scanning sequence is composed of fat pressing module 1 and STEAM sequence 2. It should be noted that in this embodiment, only the sequence consisting of the fat pressing module 1 and STEAM sequence 2 is used as the pre-scanning sequence in step S01. The scanning sequence is described, but this sequence is not used to limit the scope of protection of the present invention. Those skilled in the art should easily think that the pre-scanning sequence of the S01 step can also be obtained by the fat-pressing module and other region-selective acquisition sequences. Composition, such as liposuction module and PRESS sequence. The frequency offset is used as an adjustable parameter of the fat-pressing pulse, and other parameters of the fat-pressing pulse such as the excitation bandwidth and flip angle are set as fixed parameters. Given multiple groups of different frequency offsets, the signals under different frequency offsets are collected. In ...

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Abstract

The invention provides a self-adaptive fat suppression pulse parameter selecting method. The method includes the steps that signals of a target region under fat suppression pulse effects of different parameters are pre-scanned and acquired, the signals are subjected to frequency spectrum distribution calculation and water signal intensity and fat signal intensity calculation, signal intensity data obtained under the effect of various groups of parameters are evaluated and compared according to a system preset evaluation formula, the evaluation result is recorded as R, and the group of fat suppression pulse parameters corresponding to the R maximum value is set as the fat suppression pulse parameter in clinical scanning. The self-adaptive fat suppression pulse parameter selecting method can determine the optimal fat suppression pulse parameters according to a current scanning case, good universality is achieved, and the fat suppression effect in the magnetic resonance scanning process is greatly improved.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a method and device for determining magnetic resonance scanning parameters. Background technique [0002] Fat suppression technology in clinical magnetic resonance imaging, that is, fat suppression, is to use narrow-frequency pulses to separately excite fat signals, and use gradient field strength to break up the excited fat signals, and then perform conventional imaging sequences. Dephased in advance, the fat signal will not be detected in conventional imaging sequence sampling, so it is called "fat suppression". [0003] Fat pressing technology is based on the physical phenomenon that water and fat have different resonance frequencies (the difference is about 200Hz at a field strength of 1.5T). When B 0 When the field is relatively uniform, the distribution of the water signal and the fat signal on the frequency spectrum is relatively concentrated, such as ...

Claims

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Application Information

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IPC IPC(8): A61B5/055G01R33/56
Inventor 蔡昆玉刘柳贺强
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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