Synchronous acquisition and calibration method for three-dimensional multi-parameter weighted magnetic resonance imaging

A magnetic resonance imaging and synchronous acquisition technology, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement, can solve the problems of lack of universal applicability, insufficient uniformity of magnetic field, and long interval time, etc.

Active Publication Date: 2017-10-20
南京拓谱医疗科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the early data acquisition and processing methods lack universal applicability on imaging systems with insufficient hardware performance, and the use of bipolar gradients can cause the chemical shift phase between the three-point Dixon echo groups to deviate from the preset value. Large, the asymmetry effect of the echo amplitude waveform is more significant, the field drift effect causes layer selection errors and causes image blurring, and the long-term exponential term of the eddy current field can also cause high-order phase errors, which cannot be refocused by 180° Elimination of pulse and linear phase cor

Method used

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  • Synchronous acquisition and calibration method for three-dimensional multi-parameter weighted magnetic resonance imaging
  • Synchronous acquisition and calibration method for three-dimensional multi-parameter weighted magnetic resonance imaging
  • Synchronous acquisition and calibration method for three-dimensional multi-parameter weighted magnetic resonance imaging

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Embodiment 1

[0051] Load the conventional gradient pre-emphasis sequence on the sequencer of the spectrometer in the usual way and adjust the eddy current field compensation parameters to correct the gradient waveform, and then load it on the sequencer figure 1 (or figure 2 ) shown in the three-dimensional / two-dimensional fast multi-echo water-fat sequence controls each hardware unit to realize the excitation, spatial encoding and acquisition of in-phase and anti-phase proton signals. Minimal phase SLR pulse waveforms that excite features such as Figure 5 and Image 6 The time-band product shown is preferably 8, the pulse width is preferably 2ms, and the minimum phase SLR waveform with both in-band and out-of-band ripple coefficients of 0.5%, G s is the block selection gradient, G p1 is the phase encoding gradient in the layer selection direction, G p2 is the two-dimensional plane phase encoding gradient, G 1 is the pre-read gradient, G 2 , G 3 and G 4 is the two-dimensional plan...

Embodiment 2

[0108] For the case where Δτ is set to 1 / Δf / 3, in the above scanning scheme, the chemical shift encoding phase of each group of echoes is set to -2π / 3, 0, 2π / 3 respectively and the data is collected, and the phase and After the magnitude error and image reconstruction, the data processing is as follows:

[0109] For any pixel of the image corresponding to any layer j, its corresponding magnetic resonance signal can be described by the following formula:

[0110]

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Abstract

The invention discloses a synchronous acquisition and calibration method for three-dimensional multi-parameter weighted magnetic resonance imaging. A three-dimensional/two-dimensional fast multi-echo water-fat separation sequence and a signal debugging method, a pre-scanning method, a scanning method, a data preprocessing method and an image reconstruction method thereof can obtain a water-fat separation image and T2 weighted (T1 weighted or PD weighted) image by one-time scanning. The three-dimensional multi-parameter weighted synchronous scanning and calibration method can maximize the number of images obtained in a single scan, including, an in-phase image, a reverse-phase image, a fat image, a fat-pressed image water, a conventional T2 weighted (or T1 weighted/PD weighted ) image, and a T2weighted images, significantly shortens clinical scanning time and increases the selectivity of clinical scanning schemes, and has less reliance on the hardware performance of an MRI system.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance, in particular to a method for synchronous acquisition and calibration of three-dimensional multi-parameter weighted magnetic resonance imaging. Background technique [0002] Clinically, transverse relaxation time (T2) weighted fat suppression images are beneficial to improve the contrast and resolution of human anatomical details, thereby improving the diagnosis rate of diseases, and are often used in conjunction with T2 weighted images. However, the inversion recovery method will reduce the image signal-to-noise ratio of other human tissues and lesions at the same time, and the frequency-selective liposuction is easily disturbed by the inhomogeneity of the magnetic field and the radio frequency field. As an advanced imaging technology, the chemical shift phase-encoded water-lipid separation imaging technology is the best choice for T2-weighted fat suppression imaging in clinical pract...

Claims

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Application Information

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IPC IPC(8): G01R33/56
CPCG01R33/5602
Inventor 罗会俊
Owner 南京拓谱医疗科技有限公司
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