MR imaging method and apparatus and computer-readable storage medium

A magnetic resonance (MRI) imaging method, comprising:

• collecting MR signal data every set time interval according to a stack-of-stars scheme or stack-of-spirals scheme, wherein in each time interval, MR signal data of each of a plurality of parallel slices arranged adjacently along a slice direction is collected as a radially-filled k-space slice or a spirally-filled k-space slice, and the radially-filled k-space slices or the or spirally-filled k-space slices of the plurality of parallel slices are stacked into a k-space column along the slice direction;
• in a process of collecting the MR signal data, performing motion detection by utilizing a pilot tone signal received by a plurality of coils, and marking MR signal data collected during a body motion as motion damage data when the body motion is detected;
• and
• performing motion correction on MR signal data after the motion damage data for k-space columns successively collected in a plurality of the time intervals, and obtaining a current MR image based on MR signal data obtained after the motion correction and MR signal data before the motion damage data,
• wherein the performing motion correction on MR signal data after the motion damage data for k-space columns successively collected in a plurality of the time intervals, and obtaining a current MR image based on MR signal data obtained after the motion correction and MR signal data before the motion damage data comprises:
• taking a k-space column with motion damage data from the k-space columns successively collected in a plurality of the time intervals as a lossy k-space column, wherein the number of lossy k-space columns is greater than 1;
• taking an adjacent lossless k-space column before a first lossy k-space column as a reference k-space column, and performing image reconstruction on the reference k-space column to obtain a reference image;
• and
• performing the following operations for each current lossy k-space column:
• performing image reconstruction on an adjacent lossless k-space column after the current lossy k-space column to obtain a correction image corresponding to the current lossy k-space column;
• performing registration on the correction image by utilizing the reference image, to obtain a correction parameter corresponding to the current lossy k-space column;
• performing correction on a reconstructed image of each lossless k-space column after the current lossy k-space column and before a next lossy k-space column by utilizing the correction parameter, to obtain a corrected reconstructed image;
• and
• superimposing a reconstructed image of each lossless k-space column before the first lossy k-space column and each corrected reconstructed image to obtain the current MR image.

A magnetic resonance (MR) imaging apparatus, comprising:

• a signal collection module configured to collect MR signal data every set time interval according to a stack-of-stars scheme or stack-of-spirals scheme, wherein in each time interval, MR signal data of each of a plurality of parallel slices arranged adjacently along a slice direction is collected as a radially-filled k-space slice or a spirally-filled k-space slice, and the radially-filled k-space slices or the or spirally-filled k-space slices of the plurality of parallel slices are stacked into a k-space column along the slice direction;
• a motion detection module configured to:
• in a process of collecting the MR signal data, perform motion detection by utilizing a pilot tone signal received by a plurality of coils, and output a corresponding body motion signal when a body motion is detected;
• and
• a motion correction and imaging module configured to mark MR signal data collected during the body motion as motion damage data based on the body motion signal;
• and perform motion correction on MR signal data after the motion damage data for k-space columns successively collected in a plurality of the time intervals, and obtain a current MR image based on MR signal data obtained after the motion correction and MR signal data before the motion damage data,
• wherein the motion correction and imaging module is configured to take a k-space column with motion damage data from the k-space columns successively collected in a plurality of the time intervals as a lossy k-space column, and when a number of lossy k-space columns is 1, calculate a correction parameter by utilizing reconstructed images of adjacent lossless k-space columns before and after the lossy k-space column, and perform correction on a reconstructed image of each lossless k-space column alter the lossy k-space column by utilizing the calculated correction parameter, to obtain a corrected reconstructed image;
• and superimpose the corrected reconstructed image and a reconstructed image of each lossless k-space column before the lossy k-space column to obtain the current MR image.

A magnetic resonance (MR) imaging apparatus, comprising:

• a signal collection module configured to collect MR signal data every set time interval according to a stack-of-stars scheme or stack-of-spirals scheme, wherein in each time interval MR signal data of each of a plurality of parallel slices arranged adjacently along a slice direction is collected as a radially-filled k-space slice or a spirally-filled k-space slice, and the radially-filled k-space slices or the or spirally-filled k-space slices of the plurality of parallel slices are stacked into a k-space column along the slice direction;
• a motion detection module configured to:
• in a process of collecting the MR signal data, perform motion-detection by utilizing a pilot-tone signal received by a plurality of coils, and output a corresponding body motion signal when a body motion is detected;
• and
• a motion correction and imaging module configured to mark MR signal data collected during the body motion as motion damage data based on the body motion signal;
• and perform motion correction on MR signal data after the motion damage data for k-space columns successively collected in a plurality of the time intervals, and obtain a current MR image based on MR signal data obtained after the motion correction and MR signal data before the motion damage data,
• wherein the motion correction and imaging module is configured to take a k-space column with motion damage data from the k-space columns successively collected in a plurality of the time intervals as a lossy k-space column, and when the number of lossy k-space columns is greater than 1,
• take an adjacent lossless k-space column before a first lossy k-space column as a reference k-space column, and perform image reconstruction on the reference k-space column to obtain a reference image;
• and
• perform the following operations for each current lossy k-space column:
• perform image reconstruction on an adjacent lossless k-space column after the current lossy k-space column to obtain a correction image corresponding to the current lossy k-space column;
• perform registration on the correction image by utilizing the reference image, to obtain a correction parameter corresponding to the current lossy k-space column;
• perform correction on a reconstructed image of each lossless k-space column after the current lossy k-space column and before a next lossy k-space column by utilizing the correction parameter, to obtain a corrected reconstructed image;
• and
• superimpose a reconstructed image of each lossless k-space column before the first lossy k-space column and each corrected reconstructed image to obtain the current MR image.