RASEE: a rapid spin-echo pulse sequence.
Most fast-imaging sequences use gradient echoes and a low flip-angle excitation. The low flip angle is used because it gives increased signal when TR less than T1. However, spin-echo sequences are less productive of certain artifacts, among them flow and magnetic susceptibility artifacts. We present a modification of the spin-echo pulse sequence designed to optimize the signal-to-noise ratio for repetition times (TR) less than 100 msec while preserving good image quality. Our implementation performs a 128 x 128 image in under 7 sec (TR = 50 msec) and has been used to follow the dynamics of Gd-DTPA in the rat kidneys.
Bogdan
A R
AR
Department of Radiology, University of Pennsylvania, Philadelphia 19104-6086.
Joseph
P M
PM
D000818:Animals; D006801:Humans; D007668:Kidney / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D015233:Models, Statistical; D008961:Models, Structural; D051381:Rats