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Magnetic resonance imaging method and device

A magnetic resonance imaging and image technology, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, measurement equipment, etc., can solve problems such as data anomalies, image artifacts, image quality effects, etc., to improve signal-to-noise ratio, The effect of improving accuracy

Inactive Publication Date: 2010-12-15
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, in the traditional sensitivity encoding technology, the uniformity of the sensitivity coefficient is too poor, and the surface of the sensitivity map obtained according to the sensitivity coefficient is not smooth, and in the process of data collection, the data is often abnormal due to movement. This results in very large artifacts to the image, which can have a significant impact on image quality

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  • Magnetic resonance imaging method and device
  • Magnetic resonance imaging method and device

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Embodiment Construction

[0037] figure 1 A method flow of magnetic resonance imaging in an embodiment is shown, including the following steps:

[0038] In step S10 , scan the field of view calibration to obtain multiple composite images, perform absolute value summation on the multiple composite images to obtain a sum image, and calculate a sensitivity coefficient based on the multiple composite images and the sum image. In one embodiment, the field of view is calibrated and scanned and sampled in K space to obtain a composite image f l (l=1, 2,..., L), by combining the composite image f l The resulting absolute value images are summed to obtain the summed image So use the following formula to calculate the sensitivity coefficient C l :

[0039] C l = f l / Am

[0040] Wherein, l is a phased array coil corresponding to one of the multiple phased array coils.

[0041] by composite image f 1 The absolute value images are added to obtain the sensitivity coefficient C l , effectively improves th...

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Abstract

The invention relates to a magnetic resonance imaging method comprising the following steps of: correcting and scanning a visual field to obtain a plurality of composite images, summing the absolute values of the plurality of composite images to obtain a summation image, and computing a sensitivity coefficient according to the plurality of composite images and the summation image; and correcting the sensitivity coefficient, and generating a reconstructed image. The magnetic resonance imaging method and device sum the absolute values of the plurality of composite images to obtain the summation image and compute the sensitivity coefficient through the summation image, thereby effectively enhancing the uniformity of the sensitivity coefficient; and after the sensitivity coefficient is corrected, the reconstructed image is generated, thereby effectively eliminating artifacts caused by a motion factor and other factors on the images in the scanning process, enhancing the resolution of the artifact-free composite images generated after reconstruction and reinforcing the robustness of the reconstructed image.

Description

【Technical field】 [0001] The invention relates to magnetic resonance imaging technology, in particular to a magnetic resonance imaging method and device. 【Background technique】 [0002] Magnetic resonance imaging has high soft tissue contrast and spatial resolution, and can flexibly select imaging parameters and imaging levels according to needs, and is widely used in clinical practice. Conventional MRI often suffers from slow imaging speed due to long data acquisition time. This is because the gradient field strength is already close to the limit, which seriously restricts the scanning speed of MRI. Therefore, in traditional magnetic resonance imaging, multi-channel parallel imaging technology is adopted, that is, multi-channel acquisition and parallel imaging algorithm, so that magnetic resonance imaging can no longer rely on the increase of gradient field strength and can greatly accelerate data acquisition. The multi-channel parallel imaging technology uses phased arra...

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Application Information

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IPC IPC(8): G01R33/48G01R33/565
Inventor 翁卓谢国喜邹超刘新邱本胜熊承义郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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