title: Single-shot GRASE imaging with short effective TEs.
abstract: A new phase-encoding scheme for gradient- and spin-echo (GRASE) imaging giving a short effective TE is described. Unlike previous orders, phase encoding is centric rather than sequential. The sequence is a development of k-banded GRASE that uses different time segments of the echo train to encode different bands of k space. This phase-encoding order has been implemented in single-shot sequences on an imager with high performance gradients. Approximately 144 phase-encoding lines can be acquired in an echo train time of 390 ms. With centric phase encoding, the effective TE is 8 ms, compared with 75 ms for sequential encoding, and signal-to-noise ratios (SNRs) in brain tissue are 50 to 70% higher. The sequence can be employed in, for example, diffusion and velocity imaging.
authors.affiliation: Department of Radiology, New York University Medical Center, NY 10016, USA.
authors.forename: G
authors.initials: G
authors.lastname: Johnson
authors.forename: D A
authors.initials: DA
authors.lastname: Feinberg
authors.forename: V
authors.initials: V
authors.lastname: Venkataraman
mesh_terms: D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology; D003198:Computer Simulation; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D013997:Time Factors