Ultra-fast single-excitation four-point Dixon water-fat separation imaging method

A water-fat separation and imaging method technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems that infants and restless patients cannot fully meet the needs of clinical diagnosis, and meet the needs of clinical diagnosis, The effect of enhancing the signal-to-noise ratio and speeding up the scanning speed

Active Publication Date: 2016-08-31
谱影医疗科技(苏州)有限公司
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  • Application Information

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Problems solved by technology

[0003] In order to overcome the technical problem that infants and restless patients still cannot fully meet the needs of clinical diagnosis under the condition of improving the efficiency of the existing technology, the present invention provides an ultra-fast single-shot four-point Dixon water-fat separation imaging method

Method used

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  • Ultra-fast single-excitation four-point Dixon water-fat separation imaging method
  • Ultra-fast single-excitation four-point Dixon water-fat separation imaging method
  • Ultra-fast single-excitation four-point Dixon water-fat separation imaging method

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Embodiment 1

[0056] Loaded on a 1.5T MRI system Figure 1 The sequence shown, and set the parameter table, where Dim1 = 256, Dim2 = 192, N = 4, Δτ = 2.3ms, TR = 160ms. The sequence is performed and 4 sets of T1-weighted echoes are acquired, each set consisting of four Dixon echoes. The k-space is divided into 4 areas according to the number of echo groups, the area number j is from 1 to 4, and each area is filled with N PE / N=24 k-space lines.

[0057] For filling in the upper half of k-space, set the preliminary phase gradient G P0 is the maximum value of the phase encoding gradient G p 1 / 4 of the phase encoding is divided into N PE / N=24 steps, the number of cycles i is from 1 to 24, the first group of echoes fills the central area, and the phase encoding gradient is i·(G P / N) / (N PE / N)=i·G P / 96; the jth group of echoes fills the jth area around, and the phase encoding gradient is i·G P / 96+(j-1)·G Δp , where G Δp =Gp / 4. For filling in the lower half of k-space, set G P0 I...

Embodiment 2

[0061] Loaded on a 3.0T MRI system Figure 1 The sequence shown, and set the parameter table, where Dim1 = 256, Dim2 = 192, N = 8, Δτ = 1.1ms, TR = 160ms. The sequence is performed and 4 sets of T1-weighted echoes are acquired, each set consisting of four Dixon echoes. The k-space is divided into 8 areas according to the number of echo groups, the area number j is from 1 to 8, and each area is filled with N PE / N=12 k-space lines.

[0062] For filling in the upper half of k-space, set the preliminary phase gradient G P0 is the maximum value of the phase encoding gradient G P 1 / 8 of the phase encoding is divided into N PE / N=12 steps, the number of cycles i is from 1 to 12, the first group of echoes fills the central area, and the phase encoding gradient is i·(G P / N) / (N PE / N)=i·G P / 96; the jth group of echoes fills the jth area around, and the phase encoding gradient is i·G P / 96+(j-1)·G Δp , where G Δp =G p / 8. For filling in the lower half of k-space, set G P0...

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Abstract

The invention discloses an ultra-fast single-excitation four-point Dixon water-fat separation imaging method. Single-excitation water-fat separation sequences and data processing modes of multiple versions are adopted, and the method is mainly used for enhancing the signal to noise ratio and increasing the scanning speed to obtain a same-phase diagram, a reverse-phase diagram, a water image and a fat image in which the field asymmetry effect is eliminated and obtain a field distribution diagram delta B0 and a precise distribution diagram (please see the formula in the description). Fast scanning is guaranteed, and meanwhile the clinical diagnosis needs of infants and restless patients are met.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to an ultrafast single-shot four-point Dixon water-fat separation imaging method. Background technique [0002] Dixon water-fat separation imaging technology is based on the magnetic resonance gradient echo or spin echo technology, using the chemical shift difference of water and fat for phase encoding, and after data post-processing to obtain the enhanced imaging of water and fat components in human anatomical structures. An advanced magnetic resonance imaging technique. Traditional Dixon water-lipid separation imaging techniques, including two-point Dixon and three-point Dixon techniques, have been widely used in clinical diagnosis, and are of unique value in the clear development of lesions under fat-suppressed conditions and the diagnosis of fatty diseases. Compared with the two-point Dixon technology, the three-point Dixon technology is beneficial to overcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
CPCA61B5/055
Inventor 罗会俊
Owner 谱影医疗科技(苏州)有限公司
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