Magnetic resonance frequency and phase position double-encoding sampling method and image reconstruction method
A technology of frequency encoding and phase encoding, which is applied in the measurement of magnetic variables, measuring devices, instruments, etc., can solve the problems of speeding up the acquisition speed and lengthening the acquisition time, and achieves the effect of reducing the sampling time and accelerating the imaging speed.
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Embodiment 1
[0056] The k-space acquisition sequence used in this embodiment is a sinusoidal acquisition sequence, and the tilt factor N is 2.
[0057] Figure 8 Schematic diagram of encoding gradient and ADC acquisition control for a sinusoidal acquisition sequence; Figure 9 It is a schematic diagram of a k-space acquisition trajectory using a sinusoidal acquisition sequence in the present invention.
[0058] Please refer to Figure 8 , G in the figure represents the gradient coil strength of magnetic resonance, where G PE Indicates the gradient of the phase encoding direction, G RO Indicates the gradient of the frequency encoding direction, (G Y Indicates the gradient in the Y direction, in general, the phase encoding gradient G PE is along the Y direction, G X Indicates the gradient in the X direction, in general, the frequency encoding gradient G RO along the X direction). ADC is an analog to digital converter, that is, a signal collector. Figure 8 The horizontal direction i...
Embodiment 2
[0072] The k-space acquisition sequence adopted in this embodiment is a reentrant acquisition sequence, and the tilt factor n is an integer greater than or equal to 4.
[0073] Figure 11 Schematic diagram of encoding gradient and ADC acquisition control for the reentry acquisition sequence; Figure 12 It is a schematic diagram of the k-space acquisition trajectory using the switchback acquisition sequence in Embodiment 2 of the present invention.
[0074] See Figure 11 , for the convenience of explanation, details such as RF pulse and layer selection gradient are omitted. The turn-back acquisition sequence provided in this embodiment is suitable for the case where the tilt factor is 2 or more. Figure 11 The turn-back acquisition sequence shown is characterized in that frequency encoding and phase encoding are added at the same time as k-space data acquisition; the phase encoding gradient is N times the frequency encoding gradient, and N is the ADC oversampling multiple; ...
Embodiment 3
[0080] The k-space acquisition sequence adopted in this embodiment is a rotary acquisition sequence, and the tilt factor N is an integer greater than 1.
[0081] Figure 14 Schematic diagram of encoding gradient and ADC acquisition control for the rotation acquisition sequence; Figure 15 It is a schematic diagram of the k-space acquisition trajectory using the rotary acquisition sequence in Embodiment 3 of the present invention.
[0082] See Figure 14 , for the convenience of illustration, Figure 14 Details such as layer selection gradient and RF pulse are omitted. The characteristic of this slewing acquisition sequence is that only one RF pulse excitation is required; after excitation, the gradient coil is used to adjust the initial entry point (such as Figure 15 60 marked in the point); phase encoding and frequency encoding are carried out at the same time, and at the same time by Figure 14 The "adapter sequence" in the box indicated by 51 and 52 in , performs posi...
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