Patent ID: 8723516

Claim:
An MRI method comprising using an MRI system that has been configured to: apply, to an object to be imaged, an initial NMR RF nutation pulse which nutates by approximately equal degrees both a first and a second species of NMR nuclei in at least a portion of the object to be imaged; thereafter apply a spectrally-selective 180° RF nutation pulse to selectively nutate said first species of NMR nuclei by substantially 180° while substantially avoiding nutation of said second different species of nuclei, thereby selectively causing subsequent NMR refocusing of said first species but not of said second species; thereafter apply a time-spaced sequence of 180° NMR RF refocusing pulses which nutate both said first and second species by approximately equal degrees to successively refocus said first species of NMR nuclei but not said second species, said sequence of refocusing pulses also being associated with phase-encoding magnetic gradient pulses to produce a respectively corresponding train of phase-encoded NMR RF spin echo responses emanating from said first species of NMR nuclei; and acquire said train of RF spin echo responses as MRI data and to store data representing same in computer-readable memory and/or using said MRI data to produce an image of said first species of nuclei.