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Bug 1355 - there is a bug in ft_volumesegment

Status CLOSED WORKSFORME
Reported 2012-03-02 14:39:00 +0100
Modified 2019-08-10 11:55:40 +0200
Product: FieldTrip
Component: preproc
Version: unspecified
Hardware: PC
Operating System: Windows
Importance: P3 critical
Assigned to:
URL:
Tags:
Depends on:
Blocks:
See also:

Ali Bahramisharif - 2012-03-02 14:39:32 +0100

if you run: mri = ft_read_mri('berends_s.mri'); ft_determine_coordsys(mri) it looks fine. However, if you after that run: cfg = []; cfg.coordsys = 'ctf'; segmentedmri = ft_volumesegment(cfg, mri); ft_determine_coordsys(segmentedmri) you get the following error : " The positive x-axis is pointing towards the right The positive y-axis is pointing towards anterior The positive z-axis is pointing towards superior ??? Error using ==> ft_determine_coordsys>xyz2label at 302 unknown coordsys Error in ==> ft_determine_coordsys at 163 [labelx, labely, labelz] = xyz2label(data.coordsys); " From the axes, it is obvious that there is a confusion between the coordinate systems of the original mri and the segmented mri.


Jan-Mathijs Schoffelen - 2012-03-02 14:41:46 +0100

problem: the transformation matrix in the segmented volume does not reflect the transformation matrix in the input.


Ali Bahramisharif - 2012-03-02 14:46:14 +0100

Here is the link to the mri file used: ftp://ftp.fcdonders.nl/pub/temporary/ftbug/


Jan-Mathijs Schoffelen - 2012-03-02 14:52:46 +0100

problem: the transformation matrix in the segmented volume does not reflect the transformation matrix in the input.


Robert Oostenveld - 2012-03-02 15:35:49 +0100

I have downloaded the mri, and executed the same steps. I don't get a problem, but a meaningful figure. See attached.


Robert Oostenveld - 2012-03-02 15:36:18 +0100

Created attachment 235 screen shot with (correct) output


Robert Oostenveld - 2012-03-02 15:37:42 +0100

(In reply to comment #5) note that the segmentedmri contains the following >> segmentedmri segmentedmri = dim: [256 256 256] transform: [4x4 double] coordsys: 'ctf' unit: 'mm' gray: [256x256x256 double] white: [256x256x256 double] csf: [256x256x256 double] cfg: [1x1 struct] If yours is different, then that suggests that you are using an older fieldtrip version.


Ali Bahramisharif - 2012-03-02 15:59:41 +0100

(In reply to comment #6) I use the fieldtrip on mentat, and I have the following: segmentedmri = dim: [256 256 256] transform: [4x4 double] coordsys: 'spm' unit: 'mm' gray: [256x256x256 double] white: [256x256x256 double] csf: [256x256x256 double] cfg: [1x1 struct] The difference is coordsys which is spm in mine and is ctf in yours, although I specified it to be ctf! BTW, this is what I get: segmentedmri.transform = 0.9992 0.0370 0.0133 -95.7202 0.0393 -0.9428 -0.3311 149.2684 0.0003 0.3313 -0.9435 46.9203 0 0 0 1.0000 whereas: mri.transform = 0.0392 -0.9244 -0.3794 186.2394 -0.9992 -0.0370 -0.0133 95.7202 -0.0018 0.3796 -0.9252 91.4222 0 0 0 1.0000


Robert Oostenveld - 2012-03-02 16:22:17 +0100

(In reply to comment #7) It might be that you are using an incorrect version of fieldtrip on mentat, or an incorrect version of spm, or a combination of both. can you upload the segmentedmri variable in a mat file? can you copy-and-paste the output of "path" in MATLAB?


Ali Bahramisharif - 2012-03-02 16:34:25 +0100

(In reply to comment #8) The segmentedmri is in /home/common/temporary/4robert/ This is my path: /home/common/matlab/spm8/external/fieldtrip/specest /home/common/matlab/spm8/external/fieldtrip/inverse /home/common/matlab/spm8/external/fieldtrip/forward /home/common/matlab/spm8/external/fieldtrip/preproc /home/common/matlab/spm8/external/fieldtrip/trialfun /home/common/matlab/spm8/external/fieldtrip/statfun /home/electromag/alibah/matlab /home/common/matlab/spm8 /home/common/matlab/spm8/EEGtemplates /home/common/matlab/spm8/apriori /home/common/matlab/spm8/canonical /home/common/matlab/spm8/config /home/common/matlab/spm8/exec /home/common/matlab/spm8/external /home/common/matlab/spm8/external/bemcp /home/common/matlab/spm8/external/ctf /home/common/matlab/spm8/external/eeprobe /home/common/matlab/spm8/external/fieldtrip /home/common/matlab/spm8/external/fieldtrip/connectivity /home/common/matlab/spm8/external/fieldtrip/fileio /home/common/matlab/spm8/external/fieldtrip/plotting 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Jan-Mathijs Schoffelen - 2012-03-02 16:38:53 +0100

please remove /home/common/matlab/spm8 and all its subdirectories from the path and try again. there is an external/fieldtrip directory which most likely causes the problem -> old version


Robert Oostenveld - 2012-03-02 16:52:49 +0100

See also http://fieldtrip.fcdonders.nl/faq/should_i_add_fieldtrip_with_all_subdirectories_to_my_matlab_path


Ali Bahramisharif - 2012-03-02 17:03:36 +0100

(In reply to comment #11) Right. The problem is resolved. I shouldn't have had spm8 in my path.


Robert Oostenveld - 2019-08-10 11:51:42 +0200

This closes a whole series of bugs that have been resolved (either FIXED/WONTFIX/INVALID) for quite some time. If you disagree, please file a new issue describing the issue on https://github.com/fieldtrip/fieldtrip/issues.


Robert Oostenveld - 2019-08-10 11:55:40 +0200

This closes a whole series of bugs that have been resolved (either FIXED/WONTFIX/INVALID) for quite some time. If you disagree, please file a new issue describing the issue on https://github.com/fieldtrip/fieldtrip/issues.