Adiabatic water suppression using frequency selective excitation.
A new method for B1-insensitive water suppression using adiabatic RF pulses is described. The transition zone of the inversion profile of adiabatic full passage (AFP) pulses is used for frequency-selective excitation followed by dephasing of the excited water with magnetic field gradients. Several improvements of AFP pulses, which also have implications for other applications, are described. The technique was evaluated by simulations based on the Bloch equations (including relaxation), in vitro experiments and an in vivo verification on neonatal and adult rat brain.
de Graaf
R A
RA
Department of Experimental In Vivo NMR, Image Sciences Institute and Bijvoet Center, Utrecht University, The Netherlands.
Nicolay
K
K
D000818:Animals; D000831:Animals, Newborn; D001834:Body Water / Q000378:metabolism*; D001921:Brain / Q000378:metabolism*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D051381:Rats; D012680:Sensitivity and Specificity