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Super-fast sectional type single-shot water-fat separation method
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A water-fat separation, segmented technology, used in the measurement of magnetic variables, measuring devices, instruments, etc.
Active Publication Date: 2017-01-11
谱影医疗科技(苏州)有限公司
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For water-fat separation imaging, the phase and time dependence of the magnetization vectors of water and fat components require precise control of radio frequency pulse and gradient pulse technology, while the excitation and acquisition methods of long echo trains are due to hardware imperfections and eddy current fields and Maxwell field effects can produce a significantly larger accumulation of phase errors
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[0100] In the case of enhanced scanning, refer to the typical values of clinical routine SPGR scanning parameters, set figure 2 The imaging sequence parameters shown are Dim1=192, Dim2=161, TR=160ms, L=4, X%=60%, TE=Δτ=4.4ms. Run the 2D imaging sequence and press Figure 6 The data is collected in the manner shown, and the k-space filling method of the inverse echo is described as follows taking the case of L=4 as an example:
[0101] A1.k space is divided into four storage areas (C, S, P, and V), which respectively store the data in the central area of k space and the data in surrounding areas, such as Figure 6 shown.
[0102] A2. The first anti-phase echo fills the central region represented by k-space C.
[0103] A3. The second anti-phase echo fills the surrounding area represented by the k-space S.
[0104] A4. The third anti-phase echo fills the peripheral area represented by k-space P.
[0127] In the case of non-enhanced scanning, refer to the typical values of clinical conventional 3D SPGR scanning parameters, set image 3 The three-dimensional imaging sequence parameters shown, such as Dim1=256, Dim2=160, Dim3=32, L=4, TR=60ms, TE=Δτ=4.4ms, the time length of the phase encoding gradient is limited within Δτ / 2. Run the 3D imaging sequence and collect k-space data, where the k-space filling method of the inverse echo is specifically described as follows by taking the case of M=4 as an example:
[0128] A1. The two-dimensional k-space is extracted according to the phase encoding order of the layer selection direction, and is divided into four storage areas (C, S, P, and V) for storing the central area data and surrounding areas of the k-space respectively, such as Figure 7 shown.
[0129] A2. The first anti-phase echo fills the central region represented by k-space C.
[0130] A3. T...
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Abstract
The invention discloses a super-fast sectional type single-shot water-fat separation method. Super-fast chemical shift imaging sequence, signal analysis model, echo amplitude attenuation compensation methods as well as rapid phase unwrapping and precision correction technologies are applied to a magnetic resonance imagingsystem, thereby realizing water-fat separation enhanced scanning and thin-layer water-fat separation imaging. The scanning efficiency can be improved substantially and image artifacts can be eliminated based on phase correction. And with a two-dimensional version, clinical application of chemical shift imaging in enhanced scanning can be realized. The method can be used for scanning of the infant or hyperactivity patient.
Description
technical field [0001] The invention relates to the technical field of medical magnetic resonance imaging, in particular to an ultra-fast segmented single-shot water-fat separation method. Background technique [0002] In medical magnetic resonance imaging (MRI), chemical shift imaging (also known as spectral imaging) is more beneficial than conventional selective fat magnetization saturation, water selective excitation, and short TI recovery (STIR) fat suppression imaging techniques in the lesion and its surroundings. Clear display of tissue, for RF field B 1 There is no special requirement for uniformity and magnetic field strength and no loss of image signal-to-noise ratio. It can also determine the relative proportion of fat and water in tissue. Dixon water-lipid separation technology is one of the chemical shift imaging techniques. Two-point and three-point Dixon water-lipid separation imaging technologies based on spin echo are widely used in clinical practice, but th...
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