Improving the sensitivity of conventional spin echo spectra by preservation of initial signal-to-noise ratio

Peyman Sakhaii; Wolfgang Bermel

doi:10.1016/j.jmr.2014.02.024

Improving the sensitivity of conventional spin echo spectra by preservation of initial signal-to-noise ratio

J Magn Reson. 2014 May:242:220-3. doi: 10.1016/j.jmr.2014.02.024. Epub 2014 Mar 7.

Authors

Peyman Sakhaii¹, Wolfgang Bermel²

Affiliations

¹ NMR Laboratory of SANOFI, C&BD (Chemistry & Biotechnology Development Frankfurt Chemistry), Industriepark Hoechst, Building G849, D-65926 Frankfurt/Main, Germany. Electronic address: Peyman.Sakhaii@sanofi.com.
² Bruker BioSpin GmbH, Silberstreifen, D-76287 Rheinstetten, Germany. Electronic address: Wolfgang.Bermel@bruker-biospin.de.

PMID: 24694868
DOI: 10.1016/j.jmr.2014.02.024

Abstract

A simple processing strategy is introduced to enhance the spectral quality and signal-to-noise ratio in conventional J resolved spectra. The idea of pseudo echo filtering is extended to conserve the primary signal-to-noise, predominating at the beginning of the FID in the indirect dimension. This is achieved by matching the maximum amplitude of the FID with that of the sine window function. Practically, the FID is right shifted by the number of acquired points in the indirect dimension; missing data points are backward predicted and finally multiplied with the unshifted sine window function. Standard processing tools are employed for this purpose. The results of data processing using different window functions with and without right shifts and back predictions are discussed. The signal-to-noise ratio of the J resolved spectrum is increased by a factor of 6 compared to standard data processing using pseudo echo filtering alone.

Keywords: Broadband homodecoupling; J resolved spectroscopy; Pseudo echo filtering; Signal-to-noise enhancement; TILT.