Rapid imaging method of blood vessel without contrast agent
An imaging method and contrast agent technology, applied in the field of medical imaging, can solve problems such as direct application of vascular imaging
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Embodiment 1
[0083] Such as image 3 As shown, by sampling the signals after two different delay times of ECG gating, for example, the delay times are d1=0.1 second and d2=0.5 seconds respectively, the sampling conditions m1 and m2 of two different blood flow states are determined. The magnetic resonance signals corresponding to the sampling conditions m1 and m2 are M1 and M2, respectively.
[0084] Referring to the N / 2 ghost imaging technology, the above two sampling conditions are alternately combined in k-space to obtain the sum signal sampling k-space, such as figure 2 As shown, the m2 k-space is shifted half a step along the direction of phase encoding, and then the shifted m2 k-space is merged with the m1 k-space to obtain the sum signal sampling k-space.
[0085] Parallel accelerated sampling in summed signal sampling k-space. For example, if the acceleration factor is R=3, when sampling the k-space of the summed signal, only the first of every three data lines is collected along ...
Embodiment 2
[0092] Such as Figure 4 As shown, under the same ECG gating condition, two different flow compensations are used in the imaging sequence, such as no flow compensation at m1 and flow compensation at m2, to determine the sampling conditions of two different blood flow states m1 and m2. The magnetic resonance signals corresponding to the sampling conditions m1 and m2 are M1 and M2 respectively.
[0093] Referring to the N / 2 ghost imaging technology, the above two sampling conditions are alternately combined in k-space to obtain the sum signal sampling k-space, such as figure 2 As shown, the m2 k-space is shifted half a step along the direction of phase encoding, and then the shifted m2 k-space is merged with the m1 k-space to obtain the sum signal sampling k-space.
[0094] Parallel accelerated sampling in summed signal sampling k-space. For example, if the acceleration factor is R=3, when sampling the k-space of the summed signal, only the first of every three data lines is ...
Embodiment 3
[0101] Such as Figure 5 As shown, by sampling the magnetic reversal of protons upstream or downstream of the imaging area, such as using a 180-degree adiabatic radio frequency pulse to achieve magnetic reversal, the sampling conditions m1 and m2 of two different blood flow states are determined. The magnetic resonance signals corresponding to the sampling conditions m1 and m2 are M1 and M2 respectively.
[0102] Referring to the N / 2 ghost imaging technology, the above two sampling conditions are alternately combined in k-space to obtain the sum signal sampling k-space, such as figure 2 As shown, the m2 k-space is shifted half a step along the direction of phase encoding, and then the shifted m2 k-space is merged with the m1 k-space to obtain the sum signal sampling k-space.
[0103] Parallel accelerated sampling in summed signal sampling k-space. For example, if the acceleration factor is 3, when sampling the k-space of the sum signal, only the first of every three data lin...
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