Re: [Freesurfer] longitudinal measures

2013-11-06 Thread Qi Wu
and > then use that for the analysis > > - you put 0 and 1 into the longitudinal qdec table for the two time > points. When the time distance is 1, the rate will be the difference. > > Best, Martin > > On Oct 24, 2013, at 4:30 PM, Qi Wu wrote: > > Hi Freesurfer users, &g

[Freesurfer] longitudinal measures

2013-10-24 Thread Qi Wu
Hi Freesurfer users, For the longitudinal stream in FS5.1, there are only 4 options of measures (do-avg, do-rate, do-pc1 and do-spc). However, if I need other measures, such as the difference between two time points (thick2-thick1), how should I do to get the values and still be able to do the vox

[Freesurfer] label issues (converting from the MNI space to the Talairach space)

2013-10-24 Thread Qi Wu
Hi Freesurfer users, I need to design a ROI map for my project. It has to be based on certain coordinates. The ideal is to draw a circle based on the coordinates in the Talairach space in Freesurfer, which I do not know how to achieve. The alternative is to draw a spherical cluster in fsl and conv

Re: [Freesurfer] Can I include this pre- vs. post- patient dataset?

2013-08-01 Thread Qi Wu
could > do would be have all your patients with the .86mm scans and your controls > with the 1mm). You could also do a small study by scanning some controls > with both sequences and seeing if there is a spurious effect, which there > might well be. > > cheers > Bruce > >

[Freesurfer] Can I include this pre- vs. post- patient dataset?

2013-08-01 Thread Qi Wu
Hi Freesurfer experts, I have a difficult decision to make and I don't know which direction is better. Your opinions are needed. We are planning a paper on the treatment effects of a drug on the cortical plasticity in a group of patients ( the pre- vs. post- design). It has been a huge challenge

[Freesurfer] mri_glmfit application in the two-stage longitudinal approach

2013-05-21 Thread Qi Wu
h only this subject, then start from > scratch. create both cross (kp5 and kp5b), the base (kp5_base) and both > longs with the correct naming . Then check if the long_mris_slopes command > still fails. > > Best, Martin > > > On 05/01/2013 12:11 PM, Qi Wu wrote: > > Dea

Re: [Freesurfer] error in longitudinal processing "dimension mismatch"

2013-05-21 Thread Qi Wu
start from > scratch. create both cross (kp5 and kp5b), the base (kp5_base) and both > longs with the correct naming . Then check if the long_mris_slopes command > still fails. > > Best, Martin > > > On 05/01/2013 12:11 PM, Qi Wu wrote: > > Dear Freesurfer experts

[Freesurfer] error in longitudinal processing "dimension mismatch"

2013-05-01 Thread Qi Wu
Dear Freesurfer experts, I have a dataset of 2 time points. I ran into problems when I tried to use the two-stage approach to pull out statistics such as the rate of change in Freesurfer 5.1. I could not even get the first stage working. The error messages I got were “ERROR: MRISar1: Surf/Src dim