A Nyquist modulated echo-to-view mapping scheme for fast spin-echo imaging

Magn Reson Med. 1995 Jun;33(6):838-42. doi: 10.1002/mrm.1910330615.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Humans
  • Image Enhancement / methods*
  • Magnetic Resonance Imaging / methods*