Parallel collection image reconstruction method and device

Abstract

The invention discloses a method for reconstructing a parallel-acquired image, comprising: generating reconstruction data by combining uniformly under-sampled data and low-frequency fully-sampled data in magnetic resonance imaging (MRI) K-space according to a hybrid sampling mode; calculating the sensitivity distribution of a coil according to the low-frequency fully-sampled data; and reconstructing an image according to the reconstruction data, the sensitivity distribution of the coil and the hybrid sampling mode. The invention also discloses an apparatus for reconstructing the parallel-acquired image. The method and the apparatus are adopted to generate reconstruction data by combining uniformly under-sampled data and low-frequency fully-sampled data in K-space according to the hybrid sampling mode and take the hybrid sampling mode into account during the image reconstruction, and the signal to noise ratio of the reconstructed image is effectively improved by using the reconstruction data combined with the low-frequency fully-sampled data in reconstructing the image since the low-frequency fully-sampled data contains more useful information.

Description

technical field [0001] The present invention relates to magnetic resonance imaging (MRI, Magnetic Resonance Imaging) technology, in particular to a parallel acquisition (PA, Parallel Acquisition) image reconstruction method and device. Background technique [0002] In MRI technology, the imaging speed is a very important parameter. Early examinations often took several hours, but imaging speed has increased significantly due to technical improvements in field strength, gradient hardware, and pulse sequences. However, rapid changes in field gradients and high-density continuous radio frequency (RF, Radio Frequency) pulses will bring about special absorption rates (SAR, Specific Absorption Rate) that cannot be tolerated by human physiological limits and heat generation in organs and tissues. Therefore, the imaging speed is improved. A bottleneck has been encountered. [0003] Subsequently, the researchers found that the speed of MRI imaging could be greatly improved by apply...

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Problems solved by technology

[0018] However, there is a price to pay for parallel acquisition

First of all, due to the reduction of the actual collected data, although the image without aliasing can be reconstructed by using parallel acquisition and reconstruction technology, the signal-to-noise ratio of the image is equal to the signal-to-noise ratio of the image obtained by full sampling under the same hardware conditions. where N f is the acceleration factor, therefore, the greater the acceleration factor, the greater the image quality degradation, that is, the greater the reduction in the signal-to-noise ratio (SNR, Signal-to-Noise Ratio)

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