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A magnetic resonance imaging method and system

A magnetic resonance imaging and image technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of discontinuous channel phase changes, signal artifacts, etc., increase the probability of signal cancellation artifacts, and suppress signals Counteracts the effect of artifacts

Active Publication Date: 2019-08-23
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the discontinuity of the phase change of each channel, in the non-smooth area with significant phase difference, the artifact of signal cancellation is often caused

Method used

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  • A magnetic resonance imaging method and system
  • A magnetic resonance imaging method and system
  • A magnetic resonance imaging method and system

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Embodiment 1

[0138] Figure 8 a is the pelvic image formed by multi-channel merger using the SOS (sum of square) method, Figure 8 b is the pelvic image formed by multi-channel merging using the adaptive channel merging method; Figure 8 c is a pelvic image formed by multi-channel merging using the method of the present invention. Through the comparison of the three, it is found that the pelvic image formed by channel combination using the SOS method has high image background noise (as shown in the square window) and poor image contrast (but no artifacts are generated in the phase discontinuity); Although the pelvic image formed by the adaptive channel merging method has a high image signal-to-noise ratio (the area enclosed by the box in the figure) and good image contrast, there are obvious signal cancellations in the phase discontinuous areas such as the A1 position and the A2 position, and the background There are also line-shaped black streaks in the noise; and the pelvic image forme...

Embodiment 2

[0140] In this embodiment, the classic sum of squares (SOS) algorithm, adaptive channel combining method and such as image 3 The channel merging method based on SNR weighting of the present invention processes abdominal images, and in order to improve the calculation performance of the reconstruction merging algorithm, first downsample the multi-channel image to calculate the merging weight, and then interpolate to the original image size for merging . Figure 9 a is the abdominal image formed by multi-channel merging using the SOS method, Figure 9 b is the abdominal image formed by multi-channel merging using the adaptive channel merging method; Figure 9 c is an abdominal image formed by multi-channel merging using the method of the present invention. Through comparison, it is found that the abdominal image formed by multi-channel merging using SOS has poor signal-to-noise ratio, the square window area shows obvious background noise, and the entire abdominal image is als...

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Abstract

The invention discloses a magnetic resonance imaging method. The magnetic resonance imaging method comprises the steps that an imaging sequence is utilized to stimulate a target area of a subject, a multi-channel RF coil is utilized to acquire a magnetic resonance signal produced in the target area, and K space data acquired through multiple channels is obtained; the K space data is reestablished to obtain multi-channel images; phases of the multi-channel images are preprocessed; the multi-channel images with the processed phases are merged to obtain a magnetic resonance image of the target area. The cancellation artifacts in the multi-channel image merging process can be effectively inhibited, and the signal-to-noise ratio of the composite image is improved. In addition, the invention provides a magnetic resonance imaging system.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of magnetic resonance imaging for medical diagnosis, in particular to a multi-channel-based magnetic resonance imaging method and system. [0003] 【Background technique】 [0004] Magnetic resonance imaging technology has the characteristics of non-invasiveness, no ionization, and radiation. The images obtained by it are clear, fine, high-resolution, and good in contrast. It can display soft tissue layers very well and can improve diagnostic efficiency. The radio frequency (radio frequency, RF) receiving coil, as the front end of the receiving chain, plays a very important role in the imaging quality and directly affects the signal-to-noise ratio of the image. Multi-RF coil imaging technology is a new magnetic resonance imaging technology developed in recent years. It is based on multi-channel RF coil (phased array) and has the characteristics of high signal-to-noise ratio and high image spatial resol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/565
Inventor 朱家煜李国斌刘楠
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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