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Bug 1612 - ft_electroderealign() cannot correctly align electrodes to head shape if the head is not in CTF orientation
| Status | CLOSED FIXED |
| Reported | 2012-07-16 19:17:00 +0200 |
| Modified | 2016-01-15 09:37:06 +0100 |
| Product: | FieldTrip |
| Component: | core |
| Version: | unspecified |
| Hardware: | PC |
| Operating System: | Windows |
| Importance: | P3 normal |
| Assigned to: | Jan-Mathijs Schoffelen |
| URL: | |
| Tags: | |
| Depends on: | |
| Blocks: | |
| See also: |
Yu Huang - 2012-07-16 19:17:22 +0200
The head shape provided in attachment is in ITAB orientation, but in line 387 & 388 of ft_electroderealign() where it calls headcoordinates(), the orientation is assumed to be CTF by default.
Yu Huang - 2012-07-16 20:25:06 +0200
Created attachment 293 input variable 'cfg' to ft_electroderealign() to reproduce the bug
Jan-Mathijs Schoffelen - 2012-07-18 16:47:41 +0200
Hi Yu Huang, I don't understand the cfg you supplied. It seems as if you specify many options, but it is not clear to me which 'method' you actually try to apply. The cfg suggests 'fiducial', whereas your question pertains to a headshape based alignment.
Yu Huang - 2012-07-18 20:01:35 +0200
I was trying to align the electrode coordinates stored in cfg.elec to the headshape based on three fiducials of that headshape, so the method should be 'fiducial'. The problem is the headshape is not in CTF orientation, so ft_electroderealign cannot correctly align it onto that headshape (new electrodes are far away from the headshape). But if I specified ITAB orientation in line 387 & 388 of ft_electroderealign() where it calls headcoordinates(), the result is correct (although the electrodes are not all exactly on the surface of the head, they are basically around the head). So I was wondering if ft_electroderealign() should add an argument of headshape orientation. Thanks!