Dear Will and Saad,
Happy New Year!
We are continuing to find that FSL-MRS is imparting a significant first order phase when fitting our data (>20 deg/ppm).
In response to your previous questions:
1. There is not a first order phase on the basis set. This is a basis set for semi-LASER that was simulated with FID-A and converted with the makebasis function in LCModel, all with pretty well default settings. Attached is the output of basis_tools vis.
2. Yes, we have removed the first point in the FID, though it doesn't change the appearance of the real part of the spectrum very much. I suspect that the deviation of the first point from a pure FID is related to some residual water that is out of phase, not to errors in the timing of the pulse sequence that would lead to a first order phase effect.
It would be great if we could place a limit on how much first order phase could be allowed on the basis set.
Please let me know if you need any further info.
Thank you so much for your help,
Erin
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