Magnetic resonance image reconstruction

A device for reconstructing a magnetic resonance image, comprising:

• at least one processor;
• and
• at least one non-transitory machine-readable storage medium coupled to the at least one processor having machine-executable instructions stored thereon that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:
• determining array coil images by reconstructing first data collected by array coils of an MM device during a prescan, wherein each coil of the array coils corresponds to a respective channel of channels;
• determining a quadrature body coil image by calculating at least one of second data collected by a quadrature body coil of the MRI device during the prescan or the first data collected by the array coils;
• obtaining a corrected quadrature body coil image by correcting a uniformity of the quadrature body coil image, wherein non-uniformity of the quadrature body coil image is caused by at least one of a main magnetic field, a radio frequency transmitting field, or a radio frequency receiving field of the MRI device;
• determining coil sensitivity maps according to the array coil images and the corrected quadrature body coil image;
• and
• reconstructing a magnetic resonance image with third data collected by the array coils during a normal scan according to the coil sensitivity maps,
• wherein correcting the uniformity of the quadrature body coil image comprises correcting a magnitude image of the quadrature body coil image by
• obtaining a binary image representing a hole region and an image support region by performing threshold segmentation for the magnitude image of the quadrature body coil image,
• calculating gradients of the binary image to obtain a boundary of the image support region,
• extrapolating the image support region to the hole region according to the boundary of the image support region to obtain an extrapolated image,
• smoothing the extrapolated image to obtain a signal modulation image,
• dividing the magnitude image of the quadrature body coil image by the signal modulation image to generate a new image, and
• obtaining a magnitude image of the corrected quadrature body coil image by performing grayscale value restoration for the new image.

A non-transitory machine-readable storage medium coupled to at least one processor having machine-executable instructions stored thereon that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:

• determining array coil images by reconstructing first data collected by array coils of an MRI device during a prescan, wherein each coil of the array coils corresponds to a respective channel of channels;
• determining a quadrature body coil image by calculating at least one of second data collected by a quadrature body coil of the MRI device during the prescan or the first data collected by the array coils;
• obtaining a corrected quadrature body coil image by correcting a uniformity of the quadrature body coil image, wherein non-uniformity of the quadrature body coil image is caused by at least one of a main magnetic field, a radio frequency transmitting field, or a radio frequency receiving field of the MRI device;
• determining coil sensitivity maps according to the array coil images and the corrected quadrature body coil image;
• and
• reconstructing a magnetic resonance image with third data collected by the array coils during a normal scan according to the coil sensitivity maps,
• wherein correcting the uniformity of the quadrature body coil image comprises:
• correcting a magnitude image of the quadrature body coil image by
• obtaining a binary image representing a hole region and an image support region by performing threshold segmentation for the magnitude image of the quadrature body coil image,
• calculating gradients of the binary image to obtain a boundary of the image support region,
• extrapolating the image support region to the hole region according to the boundary of the image support region to obtain an extrapolated image,
• smoothing the extrapolated image to obtain a signal modulation image,
• dividing the magnitude image of the quadrature body coil image by the signal modulation image to generate a new image, and
• obtaining a magnitude image of the corrected quadrature body coil image by performing grayscale value restoration for the new image.