Dear Freesurfer users,
I run FS on my 670 subjects. All the scans were acquired on a 1.5T Philips scan. I noticed that my values in the WM are near 100-110 but not exactly 110. I think it is a problem! Is it link to the 1.5T? How can I fix it? I joined my log file of QA tools: could you help me to undertand the output?
wm-anat-snr results:
SNR: Anatomical signal-to-noise ratio in white matter mWM: Mean white matter intensity value stdWM: Standard deviation of white matter intensity value voxWM: Total number of white matter voxels in eroded mask
SubjID SNR mWM stdWM voxWM 1 13,37* 104,18 7,79* 24181 <------ 2 14,79* 105,90 7,16* 22148 <------ 3 13,57* 104,75 7,72* 37341 <------ 4 12,67* 104,18 8,22* 29311 <------ 5 14,36* 105,44 7,34* 48083 <------ 6 11,40* 103,92 9,11* 47704 <------ 7 14,52* 104,71 7,21* 25706 <------ 8 9,92 101,42 10,22 40187 9 11,31* 104,28 9,22* 22967 <------ 10 11,61* 102,92 8,86* 19850 <------ 11 14,78* 105,05 7,11* 26607 <------ 12 11,36* 105,33 9,27* 15465 <------ 13 11,30* 103,69 9,18* 34685 <------ 14 11,73* 105,20 8,97* 40471 <------ 15 11,92* 104,04 8,73* 13777 <------ 16 9,46 102,04 10,79 30314 17 12,60* 106,40 8,44* 38432 <------
I thought it can help me to quickly identify the subjects who didn't work for this step. For example, the subject n°8 has a problem?
Thanks, Charlotte