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Independent motion correction in respective signal channels of a magnetic resonance imaging system

A magnetic resonance imaging and motion correction technology, applied in the measurement of magnetic variables, measuring devices, instruments, etc., can solve the problems of image blur and ghosting or trailing artifacts, limited global motion correction, etc., to reduce the scanning time, Increased patient throughput, effect of precise motion correction

Inactive Publication Date: 2008-04-30
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology

However, while conventional methods have covered a wide range of motion modes (translation, stretch, rotation, shear) including fully affine motion, they are easily and inherently limited to the correction of global motion, which Correction follows a uniform model over the entire body
If parts of the imaging volume are static or are in different motion patterns, a mismatch in the applied motion correction will result in blurring and ghosting or smearing artifacts throughout the image

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  • Independent motion correction in respective signal channels of a magnetic resonance imaging system
  • Independent motion correction in respective signal channels of a magnetic resonance imaging system

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Embodiment Construction

[0027]For the sake of clarity, the current state of the art related to the present invention is first introduced. In magnetic resonance (MR) imaging, motion is a major source of image artifacts. Various known schemes have been used to deal with the different types of movements (breathing, heart movements) that may occur during MR examinations. Use triggered or gated acquisition to "freeze" movement by restricting data acquisition to short-term frames with equivalent motion states, such as the rest of the heart at the end of diastole, or a stable position at the end of expiration. A particular disadvantage of this scheme is that the scan time is significantly increased because the scan efficiency is reduced or the amount of MR data collected per time unit is reduced. For example, in cardiac imaging, less than 10% of the cardiac cycle (the end of the cardiac resting period) is used for data collection. In addition, due to respiratory gating, (approximately) 50% of the collected data...

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Abstract

A magnetic resonance imaging (MRI) system, wherein a plurality of independent signal acquisition channels, defined by spatially separated coil elements (14a, 14b, 14c, 14d, 14e, 14f) is provided. The signals received by each of the channels are individually motion corrected before image reconstruction, so that non-uniform, non-affine motion across the imaging volume can be corrected locally. Motion correction may be prospective or retrospective.

Description

Technical field [0001] The present invention generally relates to nuclear magnetic resonance imaging methods and systems, and more particularly, to a method for acquiring magnetic resonance imaging (MRI) data using a multi-channel magnetic resonance (MR) system, wherein the system uses multiple independent signal acquisition channels. Background technique [0002] Magnetic resonance imaging (MRI) is a widely used medical diagnostic imaging technique. In a conventional MRI scanner, the patient is placed in a strong static magnetic field that aligns the magnetic moment of the nucleus with the non-zero spin quantum number parallel or non-parallel to the field. The Boltzmann distribution of the magnetic moment between the two azimuths results in a net magnetisation along the field direction. The magnetization can be controlled by applying a radio frequency (RF) magnetic field at a frequency determined by the studied nuclide (usually hydrogen atoms present in the body, mainly in water...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/567G01R33/3415
CPCG01R33/56509G01R33/5676G01R33/3415
Inventor C·斯特宁K·内尔克P·伯尔纳特
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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