#232 parameters for processing the GE phantom data from sample data

[Anonymous]

Hi :

Can anyone provide a set of parameters to process/post process the GE phantom data
from the sample data?

I was trying to preproc with Apodize lorentzian window, 10 hz width and zero-fill for 256 points.
After the recon, however, I could not see any reasonable peaks such as NAA, Cho or Cr peaks.
The curves look strange. I think I did not have proper parameters set. Any help is appreciated.

Thanks.

Wen

[Anonymous]

Hi all:
Is there any correction needed when performing
H1 spectra ? I finally obtained some peaks with
about 0.3 ppm off for GE MRS phantom.data.

Any suggestion is appreciated.

[jasonc]

Hi, Processing details will be specific to your data and what you are trying to do. If you are starting with a GE 1H Phantom Pfile I'd start by looking with only the spatial/spectral FFT and then decide if you need to apply and additional processing (apodize, zero fill, phase, baseline etc). The 10Hz Lorentzian width for your 1H data is probably too large.

[Anonymous]

Hi Jason:
Thank you for your response.
My purpose is to get a reasonable spectrum to reveal
the NAA, Cr and Cho peaks. I am able to do that now.
The only thing missing is the frequency shft of the peaks.
Cr should have the peak around 3.0 ppm but now it locates at 2.8 ppm.
Cho peak should be at 3.21 but now it is at 3.0
NAA peak should be 2.0 ppm but is it locates 1.7ppm.

I wonder how can I perform the frequency alignment to adjust the shift.

Thanks.

Wen