Unwanted Signal Leakage in Excitation Sculpting with Single Axis Gradients

Research output: Contribution to journalArticlepeer-review

Abstract

Excitation sculpting (T-L. Hwang and A. J. Shaka, J. Magn. Reson. A 112, 275-279 (1995)) used for solvent suppression and selective excitation in NMR bases its success on the ability to remove baseline and phase errors created by the application of selective if pulses. This is achieved by the application of two pulsed field gradient (PFG) echoes in sequence. It is essential that the two pairs of PFGs select the coherence transfer steps independently of each other, which is conveniently achieved if they are applied along orthogonal spatial axes. Here, the much more common case where both PFG pairs must be applied along a single axis is investigated. This is shown to lead to complications for certain ratios of PFG strengths. The original theory of excitation sculpting is restated in the spherical basis for convenience. Some of the effects can only be explained by invoking the dipolar demagnetizing field.

Original languageEnglish (US)
Pages (from-to)206-214
Number of pages9
JournalJournal of Magnetic Resonance
Volume137
Issue number1
DOIs
StatePublished - Mar 1999

Keywords

  • Coherence pathways
  • Dipolar demagnetizing field
  • Excitation sculpting
  • Pulsed field gradients
  • Solvent suppression

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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