SUSCEPTIBILITY CORRECTION AND CONTRAST ENCODING WITH SIMULTANEOUSLY REFOCUSED MR IMAGES

摘要

A method of refocusing multiple images of the same slice position is used to correct for susceptibility errors which cause signal loss in regions of a single EPI image. Each of the simultaneously recorded images is encoded with a different weighting of rephrasing by a correction gradient pulse, and these simultaneously recorded images are combined into one image which has signal recovery in the regions of high susceptibility phase errors. This pulse sequence provides simultaneous recording of multiple images on the same slice volume to measure velocity of motion with correction of phase shifts from field inhomogeneity and susceptibility. Additional methods provide different MRI improvements.