B1-insensitive, single-shot localization and water suppression.
A technique for single-shot, localized, water-suppressed in vivo 1H NMR with high immunity to B1 inhomogeneities is described. The single-shot localization is based on complete outer-volume suppression which is achieved with optimized, adiabatic BIR-4 pulses in combination with BO gradient modulation. B1-insensitive water suppression is achieved with BISTRO, a train of selective adiabatic full-passage pulses interleaved with BO gradient crushers. Computer simulations based on the Bloch equations, experimental images of the localized volume, and in vivo 1H spectroscopy experiments demonstrate the excellent spatial localization and water suppression.
Department of in vivo NMR, Bijvoet Center, Utrecht University, The Netherlands.
R A
RA
de Graaf
Y
Y
Luo
M
M
Garwood
K
K
Nicolay
D016477:Artifacts; D003198:Computer Simulation; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D019047:Phantoms, Imaging