I have run mri_ms_fitparms (version 5.1.0) on phantom data from two multiecho flash volumes (5 and 20 degrees with 8 echos: 1.67ms - 14.83ms in 1.88ms steps) at 7T utilizing a b1 map for correction.
How does mri_ms_fitparms know the field strength (I can't figure out where the information is when I read the mgz files using MRIread.m)?
I notice that the T1 volume seems to have graded steps of 5ms. Is this due to the table of 1ms stepped T1 values in the table described in Fischl et al. 2004 (and the data in this case being collected at 7T)?
Is there any way to increase the sensitivity?
Interestingly, this effect seems to only have a small effect on the values of the PD.mgz; however, from the 2004 Fischl paper, I would have expected it to have a large effect.
What concerns should I have about using the PD.mgz to represent the Equilibrium Magnetization in terms of accuracy of the values?
Thank You, Dan