def test_head_to_mni():
"""Test conversion of aseg vertices to MNI coordinates."""
# obtained using freeview
coords = np.array([[22.52, 11.24, 17.72], [22.52, 5.46, 21.58],
[16.10, 5.46, 22.23], [21.24, 8.36, 22.23]])
xfm = _read_talxfm('sample', subjects_dir)
coords_MNI = apply_trans(xfm['trans'], coords)
trans = read_trans(trans_fname) # head->MRI (surface RAS)
mri_head_t = invert_transform(trans) # MRI (surface RAS)->head matrix
# obtained from sample_audvis-meg-oct-6-mixed-fwd.fif
coo_right_amygdala = np.array([[0.01745682, 0.02665809, 0.03281873],
[0.01014125, 0.02496262, 0.04233755],
[0.01713642, 0.02505193, 0.04258181],
[0.01720631, 0.03073877, 0.03850075]])
coords_MNI_2 = head_to_mni(coo_right_amygdala, 'sample', mri_head_t,
subjects_dir)
# less than 1mm error
assert_allclose(coords_MNI, coords_MNI_2, atol=10.0)
def test_head_to_mni():
"""Test conversion of aseg vertices to MNI coordinates."""
# obtained using freeview
coords = np.array([[22.52, 11.24, 17.72], [22.52, 5.46, 21.58],
[16.10, 5.46, 22.23], [21.24, 8.36, 22.23]])
xfm = _read_talxfm('sample', subjects_dir)
coords_MNI = apply_trans(xfm['trans'], coords)
trans = read_trans(trans_fname) # head->MRI (surface RAS)
mri_head_t = invert_transform(trans) # MRI (surface RAS)->head matrix
# obtained from sample_audvis-meg-oct-6-mixed-fwd.fif
coo_right_amygdala = np.array([[0.01745682, 0.02665809, 0.03281873],
[0.01014125, 0.02496262, 0.04233755],
[0.01713642, 0.02505193, 0.04258181],
[0.01720631, 0.03073877, 0.03850075]])
coords_MNI_2 = head_to_mni(coo_right_amygdala, 'sample', mri_head_t,
subjects_dir)
# less than 1mm error
assert_allclose(coords_MNI, coords_MNI_2, atol=10.0)