Spectra flipped on non edited Philip MRS data sets

Data Processing
1

Spectrum flipped with Osprey processing on short echo time SV Philips MRS data.

Any suggestions?

2

Hi Pom,

Are you providing water reference data as well? And do you know whether the metabolite data have been eddy-current-corrected on the scanner already?

If the answers are “yes” and “yes”, try providing the water reference data in the files_w instead of the files_ref field of the job file. That way, Osprey doesn’t use them to perform eddy-current correction, but will still use them for water-scaled quantification.

Thanks,
Georg

3

Aloha,

Thanks Georg for getting back to me.

Switching file_ref to files_w, I got an error in LCModel for missing water unsuppressed files.

I think my 180 flipped spectra output might have been from an over suppressed water ref file, compared to Philips MRS SV data set in Osprey-example data. Can you please point to the code that I can fix this.

Appreciate your comments.
Pom