Magnetic resonance dynamic imaging sampling method and image reconstruction methods
A dynamic imaging and image reconstruction technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of slow MRI imaging speed and poor imaging quality, and achieve the advantages of reducing sampling time, improving quality, and good robustness Effect
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Embodiment 1
[0033] figure 1 It is a schematic diagram of the Cartesian sampling method, which is a preferred embodiment of the accelerated sampling method for magnetic resonance dynamic imaging of the present invention. The thick dashed line represents the sampled data points in k-space, and the thin dashed line represents the unsampled data points in k-space. The k-space sampling positions of different frames are complementary or approximately complementary, and the k-space center position of each frame can properly collect some more data. The number of sampling points in each frame is only for illustration. The specific implementation manner of Cartesian sampling will be described in detail below.
[0034] Firstly, the number N of frames to be scanned is determined according to the actual application requirements. Then, the sampling position of each frame is calculated according to the sampling rate and the specific number of scanned frames N, so as to ensure that different sampling ...
Embodiment 2
[0036] figure 2 It is another preferred embodiment of the accelerated sampling method for magnetic resonance dynamic imaging of the present invention, and it is a schematic diagram of a radial sampling method. The thick dashed line represents the sampled data points in k-space, and the thin dashed line represents the unsampled data points in k-space. The k-space sampling positions of different frames are complementary or nearly complementary. The number of sampling points in each frame is only for illustration.
[0037] As shown in the figure, it is assumed that dynamic imaging collects a total of N frames of images, and then the sampling position of each frame is calculated according to the sampling rate and the specific number of scanned frames N to ensure that different sampling points form a complementary or approximately complementary relationship. Different frames can collect data from different angles, and the final combination is equivalent to the k-space being full...
Embodiment 3
[0039] In this embodiment, the sampling method and the image reconstruction are combined, and the cardiac cine imaging is taken as an example for specific description. Include the following steps:
[0040] The first step is to determine the number of phases of cardiac cine imaging, that is, the number of frames to be scanned, in the protocol preparation stage before patient scanning;
[0041] The second step is to calculate the sampling point position of each frame according to the sampling rate, the number of scanned frames and other information;
[0042] The third step is to scan the patient to obtain k-space data;
[0043] The fourth step is to combine the k-space data of each frame to obtain the combined k-space;
[0044] The fifth step is to perform inverse Fourier transform on the combined k-space data to obtain the combined image;
[0045] In the sixth step, the combined image is used as a priori image and reconstructed to obtain the final result.
[0046]If other r...
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