If you have a tkregister registration file called subj1.mat, then name
it something else as the volume reading tools think that is an
spm-style .mat file and try to read it as a matlab4 matrix.
doug
Nguyen, Thang Q wrote:
Hello all,
I get a directional
cosine error when I try to register data
or extract values from them so I tried mri_info
and
get this message:
mri_info subj1.img
matfile: only read
256 bytes of name (810698068 specified)
MatlabRead: readHeader
returned NULL
WARNING: analyzeRead(): matfile
subj1.mat exists but
could not read ...
may not be matlab4 mat file ... proceeding
without it.
-
INFO: could not find
subj1.mat file for direction cosine
info.
INFO: use Analyze 7.5 hdr-hist.orient
value: 0, transverse unflipped
(default).
INFO: if not valid,
please provide the information in
subj1.mat file
-
Volume information for
subj1.img
type: analyze4d
dimensions: 79 x 95 x 68
voxel sizes: 2., 2.,
2.
type: FLOAT (3)
fov: 79.000
xstart: -39.5, xend: 39.5
ystart: -47.5, yend: 47.5
zstart: -34.0, zend: 34.0
TR: 0.00 msec, TE: 0.00 msec,
TI: 0.00 msec, flip angle:
0.00 degrees
nframes: 1
ras xform
present
xform info: x_r = -1.,
y_r = 0., z_r = 0.,
c_r = 0.
: x_a
= 0., y_a
= 1., z_a
= 0., c_a
= 0.
: x_s = 0.,
y_s
= 0., z_s
= 1., c_s
= 0.
Orientation
: LAS
Primary Slice Direction:
axial
voxel to ras
transform:
-2. 0. 0. 79.
0. 2. 0. -95.
0. 0.
2. -68.
0. 0. 0.
1.
voxel-to-ras determinant
-8
ras to voxel
transform:
-0.5000 -0. -0. 39.5000
0. 0.5000 0. 47.5000
0. 0.
0.5000 34.
0. 0. 0.
1.
Here is the mat file:
Subj1
2.00
2.00
200.00
1.054861e+00
-2.348376e-02 -1.086195e-01 7.747378e-01
9.350572e-02
-3.302234e-01 1.067427e+00 -3.124532e+01
-4.640190e-02
-9.299399e-01 -3.056859e-01 -7.546637e+00
0.00e+00 0.00e+00 0.00e+00
1.00e+00
round
What does the matlab error mean? Why
cant it read the directional
cosine?
-Thang
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Douglas N. Greve, Ph.D.
MGH-NMR Center
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