A Nyquist modulated echo-to-view mapping scheme for fast spin-echo imaging.
A new scheme for assignment of echoes to views in fast spin-echo imaging was developed. The scheme places early and late echoes in alternating lines of the periphery of k-space; continued alternation of echoes arising closer to the middle of the echo train encodes the central portion of k-space. The scheme has two effects: a) The echo-to-echo signal decay that usually gives rise to multiple faint ghosts, now yields a single Nyquist ghost that is removed by phase over-sampling. b) Mapping earlier echoes (and thus more energy) to the periphery of k-space yields sharper edges.
Keller
P J
PJ
Department of MRI Research, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona 85013-4496, USA.
Heiserman
J E
JE
Fram
E K
EK
Rand
S D
SD
Drayer
B P
BP
D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*