Hi Gonzalo,
it is possible to run those tools on that data. The problem is you will never know if the effect you find is due to anatomical changes or scanner / field strength differences. Maybe you could scan 10-20 controls on the 1.5 and 3 T scanner back to back , to estimate scanner effects (using the assumption that anatomical changes are close to zero, which of course could be wrong, as there will be motion and hydration effects. Both could be affected by the order of scans, so I would randomly select which scan is done first (1.5 or 3T). Anyway with that data you could compare your effect with the test-retest scanner effect to see if there are significant differences.
Best, Martin
On 11/03/2015 07:41 PM, Gonzalo Rojas Costa wrote:
Hi:
I have two timepoints of the same patient: the first is in 1.5T and the second in 3.0T... Is it possible to do the longitudinal study (subcortical volumes) using the Workflow Summary described in https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalProcessing ?...
Sincerely,
Gonzalo Rojas Costa
-- Gonzalo Rojas Costa Laboratory for Advanced Medical Image Processing Department of Radiology Clínica las Condes Lo Fontecilla 441, Las Condes, Santiago, Chile. Tel: 56-2-2105170 Cel:56-9-97771785 tel:56-9-97771785 www.clc.cl http://www.clc.cl
Gonzalo Rojas Costa Laboratory for Advanced Medical Image Processing Department of Radiology Clinica las Condes Lo Fontecilla 441, Las Condes, Santiago, Chile Tel: 56-2-2105170 Cel:56-9-97771785 tel:56-9-97771785 www.clc.cl http://www.clc.cl
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer