Patent ID: 6265873
Filing Date: 2001-07-24
Classification: G01R

Abstract:
A method for producing an image with an MRI system, the steps comprising:a) producing transverse magnetization in a region of interest by producing an RF excitation pulse at a reference phase;b) producing a series of RF refocusing pulses at regular intervals following step a), wherein the phase of successive RF refocusing pulses is advanced with respect to the reference phase by an amount .phi. which increases as the function of a sweep factor .DELTA. and the square of an index i, and wherein the series of RF refocusing pulses includes a first subseries of odd numbered RF refocusing pulses alternating with a second subseries of even numbered RF refocusing pulses, so that the series of RF refocusing pulses includes successive pairs of the odd and even numbered RF refocusing pulses;c) acquiring a first set of NMR echo signals respectively occurring after the odd numbered RF refocusing pulses and storing the acquired data in a S.sub.odd k-space data set;d) acquiring a second set of NMR echo signals respectively occurring after the even numbered RF refocusing pulses and storing the acquired data in a S.sub.even k-space data set; ande) reconstructing an image by Fourier transforming and combining both k-space data sets.