Dear all,

I have 115 subjects , and I would like to perform average cortical thickness ,pial surface .

I have used mri_concat for this and i am getting dimension mismatch

" mri_concat k***/surf/lh.thickness --mean --o /media/vasudev/vkirsch4/Data_Driven/Thickness_Pial/lh_thickness/lh.thickness.fsaverage.mean.mgh

ninputs = 115
Checking inputs
ERROR: dimension mismatch between k100/surf/lh.thickness and k102/surf/lh.thickness "

I have checked the dimensions of the subjects and following is the output , it seems there is a problem with dimensions of all the thickness files, could some one please let me know how i could perform group average thickness in this case ?

" mri_info k102/surf/lh.thickness
Volume information for k102/surf/lh.thickness
          type: curv
    dimensions: 109303 x 1 x 1
   voxel sizes: 1.0000, 1.0000, 1.0000
          type: FLOAT (3)
           fov: 109303.000
           dof: 0
        xstart: -54651.5, xend: 54651.5
        ystart: -0.5, yend: 0.5
        zstart: -0.5, zend: 0.0
            TR: 0.00 msec, TE: 0.00 msec, TI: 0.00 msec, flip angle: 0.00 degrees
       nframes: 1
       PhEncDir: UNKNOWN
ras xform not present
    xform info: x_r = -1.0000, y_r =   0.0000, z_r =   0.0000, c_r =     0.0000
              : x_a =   0.0000, y_a =   0.0000, z_a =   1.0000, c_a =     0.0000
              : x_s =   0.0000, y_s = -1.0000, z_s =   0.0000, c_s =     0.0000
Orientation   : ???
Primary Slice Direction: unknown

voxel to ras transform:
               -1.0000   0.0000   0.0000 54651.5000
                0.0000   0.0000   1.0000    -0.5000
                0.0000 -1.0000   0.0000     0.5000
                0.0000   0.0000   0.0000     1.0000

voxel-to-ras determinant -1

ras to voxel transform:
               -1.0000   0.0000   0.0000 54651.5000
               -0.0000 -0.0000 -1.0000     0.5000
               -0.0000   1.0000 -0.0000     0.5000
                0.0000   0.0000   0.0000     1.0000
"

mri_info k100/surf/lh.thickness
Volume information for k100/surf/lh.thickness
          type: curv
    dimensions: 116434 x 1 x 1
   voxel sizes: 1.0000, 1.0000, 1.0000
          type: FLOAT (3)
           fov: 116434.000
           dof: 0
        xstart: -58217.0, xend: 58217.0
        ystart: -0.5, yend: 0.5
        zstart: -0.5, zend: 0.0
            TR: 0.00 msec, TE: 0.00 msec, TI: 0.00 msec, flip angle: 0.00 degrees
       nframes: 1
       PhEncDir: UNKNOWN
ras xform not present
    xform info: x_r = -1.0000, y_r =   0.0000, z_r =   0.0000, c_r =     0.0000
              : x_a =   0.0000, y_a =   0.0000, z_a =   1.0000, c_a =     0.0000
              : x_s =   0.0000, y_s = -1.0000, z_s =   0.0000, c_s =     0.0000
Orientation   : ???
Primary Slice Direction: unknown

voxel to ras transform:
               -1.0000   0.0000   0.0000 58217.0000
                0.0000   0.0000   1.0000    -0.5000
                0.0000 -1.0000   0.0000     0.5000
                0.0000   0.0000   0.0000     1.0000
"

Thanks,

Vasudev