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Partial echo compressed sensing-based quick magnetic resonance imaging method

A magnetic resonance imaging and echo compression technology, which is applied in sensors, medical science, diagnostic recording/measurement, etc., to achieve the effect of shortening the echo time, shortening the data acquisition time, and reducing the echo time

Inactive Publication Date: 2012-12-05
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0007] The invention patents applied for above show that there is no patent specifically for compressive sensing technology in the field of MRI

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  • Partial echo compressed sensing-based quick magnetic resonance imaging method
  • Partial echo compressed sensing-based quick magnetic resonance imaging method
  • Partial echo compressed sensing-based quick magnetic resonance imaging method

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with accompanying drawing.

[0063] A fast magnetic resonance imaging method based on partial echo compressive sensing includes three steps: random variable density partial echo data acquisition, POCS reconstruction based on wavelet soft domain value denoising, and minimizing L1 norm based on finite difference transform. Non-linear reconstruction.

[0064] Randomly variable density partial echo data acquisition includes two steps: generating a three-dimensional random mask and collecting data according to the three-dimensional random mask:

[0065] 1-1. Generate a three-dimensional random mask

[0066] Generate a two-dimensional random mask on the phase encoding and layer encoding planes, specifically: collect data at a high density in the central area of ​​k-space where the amount of information is concentrated, and perform random sparse collection around the central area to generate a two-dimensiona...

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Abstract

The invention discloses a partial echo compressed sensing-based quick magnetic resonance imaging (MRI) method. The conventional imaging method has low speed and high hardware cost. The method comprises the following steps of: acquiring echo data of a random variable density part, namely intensively acquiring data in a central area of a k-space and acquiring the data around the k-space randomly and sparsely to generate a two-dimensional random mask, adding the two-dimensional random mask into every data point which needs to be acquired on a frequency coding shaft to form a three-dimensional random mask, and acquiring the data of the k-space according to the generated three-dimensional random mask; re-establishing by projection onto convex sets based on a wavelet domain which is de-noised by soft thresholding; and nonlinearly re-establishing a minimum L1 normal number based on finite difference transformation, namely sparsely transforming an image space signal x, determining an optimization objective and solving the optimization objective. By the method of the invention, partial echo technology and compressed sensing technology are combined and applied to data acquisition of MRI, sothat echo time is shortened, and data acquisition time is shortened at the same time.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and relates to a fast magnetic resonance imaging method based on partial echo compression sensing. Background technique [0002] MRI (Magnetic Resonance Imaging) is a tomographic imaging technique that uses nuclear magnetic resonance signals measured in vitro to generate physical and chemical properties of internal organs. Because MRI has no adverse effects on the body and has the advantages of high soft tissue resolution ability, it has been widely used in clinical disease detection. However, the application of MRI is often limited by the long data acquisition time. [0003] Data acquisition for MRI is performed in k-space (frequency space). The k-space encoding consists of layer encoding in the kz direction, phase encoding in the ky direction, and frequency encoding in the kx direction. Reducing the number of data acquisition points on the phase and layer coding plane (ky_kz) can ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055
Inventor 金朝阳杜一平
Owner HANGZHOU DIANZI UNIV
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