On Thu, 2011-06-23 at 09:12 -0700, Seán Froudist Walsh wrote:
> Dear FreeSurfers,
>
> I am looking for a little help comparing longitudinal data. I have
> three timepoints on each patient and have been able to get individual
> spc-thickness maps using the long_mris_slopes command where my table
> included all three time points. I would however like to compare
> different timepoints with each other: tp3-tp2 and tp2-tp1.
>
> I was hoping it would be as simple as specifying a new qdec table
> including (for example) only tp3 and tp2, and giving new output names
> using the following command
>
> long_mris_slopes --qdec ./qdec/long.qdec.tableTP23.dat --meas
> thickness --hemi lh --do-avg --do-rate --do-pc1 --do-spc --do-stack
> --do-label --out-avg=long23.thickness-avg.mgh
> --out-rate=long23.thickness-rate.mgh
> --out-pc1=long23.thickness-pc1.mgh --out-spc=long23.thickness-spc.mgh
> --out-stack=long23.thickness-stack.mgh --out-label=long23.cortex
> --time scan --qcache fsaverage
>
> but I get the following error:
>
> mris_calc:
> Sorry, but I seem to have encountered an error.
> While making backup of internal data arrays,
> it seems that some of the backups already exist.
>
> I'm not really sure what the internal data arrays are, and would
> greatly appreciate any help.
>
> Many thanks in advance and all the best,
>
> Seán
>