Image processing method of hyperpolarized gas magnetic resonance
An image processing and magnetic resonance technology, which is applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, and measurement of magnetic variables, etc., can solve the problems of difficulty and complexity in obtaining high-quality hyperpolarized gas magnetic resonance images, and achieve image The effect of detail information enhancement and measurement quality
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[0025] Example 1:
[0026] figure 1 It is a schematic block diagram of a hyperpolarized gas magnetic resonance imaging processing method of the present invention, which mainly includes—determination of hyperpolarized gas magnetic resonance imaging parameters (including echo time, repetition time, matrix size, number of layers, layer thickness, field of view, etc. ), k-space data acquisition (fixed-angle excitation / center encoding), coefficient weight matrix determination, k-space data transformation, MRI reconstruction (inverse Fourier transform), and image post-processing (denoising) to obtain improved quality ultra Polarized gas magnetic resonance imaging.
[0027] Specifically:
[0028] Step 1, select the imaging sequence, set the echo time, set the excitation angle, and obtain the original hyperpolarized gas magnetic resonance k-space data.
[0029] Because the longitudinal magnetization vector of hyperpolarized gas magnetic resonance is non-reproducible, hyperpolarized...
Example Embodiment
[0053] Example 2:
[0054] like image 3 As shown, steps 1 to 3 in this embodiment are different from those in Embodiment 1 as follows: the imaging parameters of human lungs are: a 1.5T magnetic resonance imager, the echo time is 2.7ms, the repetition time is 6.8ms, and the matrix size is 128×128, the number of layers is 7, the layer thickness is 20mm, and the field of view is 400×400mm 2 , the bandwidth is 25.6kHz, the total scanning time is 6.1s, fixed-angle excitation (excitation angle is 9°), FLASH imaging sequence, center coding, the size of the coefficient weight matrix is 128×128, and the coefficient weight matrix is according to formula (7), The angle θ in the coefficient weight matrix is set to 6°. Others are the same as in Example 1.
[0055] image 3 A. image 3 B and image 3 C are the magnetic resonance images reconstructed according to the original hyperpolarized gas magnetic resonance k-space data of the fourth, fifth and sixth layers, respectively; ...
Example Embodiment
[0060] Example 3
[0061] like Figure 4 As shown, steps 1 to 3 in this embodiment are different from those in Embodiment 1 as follows: the imaging parameters of human lungs are: a 1.5T magnetic resonance imager, the echo time is 2.7ms, the repetition time is 6.8ms, and the matrix size is 128×128, the number of layers is 8, the layer thickness is 20mm, and the field of view is 400×400mm 2 , the bandwidth is 25.6kHz, the total scanning time is 6.97s, the fixed angle excitation (excitation angle is 9°), the FLASH imaging sequence, the center encoding, the coefficient weight matrix size is 128×128, and the coefficient weight matrix is according to formula (7), The angle θ in the coefficient weight matrix is set to 6°. Others are the same as in Example 1.
[0062] Figure 4 A. Figure 4 B and Figure 4 C are the magnetic resonance images reconstructed according to the original hyperpolarized gas magnetic resonance k-space data of the fifth, sixth and seventh layers, resp...
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