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DIXON water-fat separation method in magnetic resonance imaging
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A technology for magnetic resonance imaging and water-fat separation, which can be used in the measurement of magnetic variables, measuring devices, instruments, etc., and can solve the problems of water-fat separation failure and errors.
Active Publication Date: 2014-01-15
SHANGHAI UNITED IMAGING HEALTHCARE
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However, because the binary system involved in water-fat imaging is nonlinear, the least-squares optimization algorithm adopted by IDEAL is prone to errors caused by local minimum interference, resulting in the failure of water-fat separation
Although many improved methods have emerged in recent years to reduce the possibility of errors, they still cannot completely solve the fundamental problem of water-fat separation failure caused by local valley bottoms.
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[0089] figure 2 It is a schematic diagram of the magnetic resonance three-field echo imaging sequence in the embodiment of the present invention. Fig. 3 is an effect diagram of water and fat separation achieved by using three field echoes in the embodiment of the present invention, wherein, Figure 3a For images of water and fat together, Figure 3b is the separated water image, Figure 3c is the separated fat image.
[0090] Please refer to figure 1 and figure 2 , the magnetic resonance DIXON water-fat separation method provided by the embodiment of the present invention uses three field echoes to realize water-fat separation, specifically including the following steps:
[0091] Step S101: apply such as figure 2 In the magnetic resonance field echo imaging sequence shown, by setting 2πΔfT1=α, 2πΔfT2=β and 2πΔfT3=α+2nπ, three field echo data of [α, β, α+2nπ] combination can be acquired. The [α, β, α+2nπ] combination means that among the three echo signals, the phase ...
Embodiment 2
[0096] Figure 4 It is a schematic diagram of three spin-echo imaging sequences of magnetic resonance in another embodiment of the present invention; FIG. 5 is an effect diagram of water-fat separation achieved by using three spin-echos in an embodiment of the present invention, wherein, Figure 5a For images of water and fat together, Figure 5b is the separated water image, Figure 5c is the separated fat image.
[0097] Please refer to figure 1 and Figure 4 , the magnetic resonance DIXON water-fat separation method provided by the embodiment of the present invention uses three spin echoes to realize water-fat separation, specifically comprising the following steps:
[0098] Step S101: select Figure 4 In the magnetic resonance imaging sequence shown, by setting 2πΔfT1=α, 2πΔfT2=β and 2πΔfT3=α+2nπ, three spin echo data of [α, β, α+2nπ] combination can be obtained. The [α, β, α+2nπ] combination means that in the three echo signals, the phase relationship between the wa...
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technical field [0001] The invention relates to a water-fat separation method in magnetic resonance imaging, in particular to an improved DIXON water-fat separation method. Background technique [0002] Human MRI (magnetic resonance imaging) signals are mainly derived from two components: water and fat. The chemical bond of hydrogen protons in water molecules is O-H bond, while the chemical bond of hydrogen protons in fat molecules is C-H bond. Due to the difference in the distribution of electron clouds around the hydrogen protons in these two structures, the magnetic field strength felt by the hydrogen protons in the water molecules is slightly higher, and finally the precession frequency of the hydrogen protons in the water molecules is slightly faster than that of the hydrogen protons in the fat molecules Some, the difference is 3.5ppm, equivalent to 150Hz / T, this precessionfrequency difference increases with the increase of field strength. For example, the field stre...
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