Magnetic resonance parallel imaging method of multi-constraint sliding window

An imaging method and sliding window technology, which are applied in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement of magnetic variables, etc., can solve problems such as noise amplification, consistent interpolation coefficients, and inability to meet imaging real-time requirements.
CN103278784AActive Publication Date: 2013-09-04SOUTHERN MEDICAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTHERN MEDICAL UNIVERSITY
Publication Date
2013-09-04

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Abstract

The invention discloses a magnetic resonance parallel imaging method of a multi-constrain sliding window. The method sequentially comprises the following steps; (1) a multi-channel coil is utilized for conducting full sampling on a middle region of K space, and forward-direction, backward-direction and self reconstruction constraint weights are respectively obtained in a fitting mode; (2) the sliding window is selected from an accelerating sampling region, the sliding window moves respectively in the direction of frequency coding and the direction of phase coding, the collected data are utilized by the sliding window at each position for reconstructing data which are not collected, and initial estimation values, corresponding to each position, in the sliding window are obtained; (3) a linear weighted average method is adopted to gain K space output values which are not collected according to the initial estimation values, corresponding to each position, in the sliding window; (4), two dimensional Fourier transform is utilized for converting K space data which are not collected into images, and all coil images are united to obtain the final output image. Image artifacts and noise of the reconstructed image are obviously reduced.
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Description

technical field

[0001] The invention belongs to the technical field of magnetic resonance imaging, and in particular relates to a multi-constraint sliding window magnetic resonance parallel imaging method reconstructed in K space. Background technique

[0002] Magnetic resonance imaging (MRI) has been widely used in clinical medical imaging due to its advantages of no ionizing radiation, rich tissue contrast information and non-invasive detection. However, limited by the Fourier encoding method and the Nyquist sampling theorem, MRI requires a long scan time, which not only brings some discomfort to the patient, but also easily produces motion artifacts in the reconstructed image. At the same time, the long scanning time limits the application of MRI to the imaging of moving objects, such as blood flow and heart. After decades of development, the method of accelerating acquisition by improving hardware performance, such as gradient switching rate and magnetic field strength,...

Claims

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