[Freesurfer] head motion values

2012-09-12 Thread New Fei Ho
Hi, I would like to compare the mean head motion between two groups. Just to clarify the values found in the mcprextreg file: 1. Do the six columns represent translationX, translationY, translationZ and rotationX, rotationY, rotationZ? 2. Are the values found in each time-point (i) absolute, i.e

Re: [Freesurfer] head motion values

2012-09-13 Thread New Fei Ho
rame and reference frame >10. trans : translation (mm) = sqrt(dS^2 + dL^2 + dP^2) > > > On 09/13/2012 11:21 AM, New Fei Ho wrote: >> Hi Doug, >> >> To explicitly clarify, does this mean >> X: L-R >> Y: Anterior-Posterior >> Z: Inferior-Superior &g

[Freesurfer] Correction for head size - Total hippocampal volume and subfield volume

2011-07-28 Thread New Fei Ho
Hi, I have two questions regarding ICV correction for total hippocampal volume (from aseg.stats) and for hippocampal subfield volumes. 1) Total hippocampal volume: I am using the mri_label_volume script that uses the atlas normalization factor as an estimate for total ICV two T1-weighted scans (T