[FieldTrip] Fiducial points of standard mri

Susmita Sen susmitasen.ece at gmail.com
Tue Oct 18 08:38:14 CEST 2016

Dear FieldTrip community,

I want to construct a headmodel from the mri data (standard mri providded
by fieldTrip). The dimension of the mri is 181 x 217 X 181The coordinate
system of the mri is *spm. *I want to change to coordinate system to
*yokogawa*. For that purpose, I have used *ft_volumerealign *function.
However, I have to provide at least three fiducial points (nsa, lpa and
rpa). I noticed that mri structure itself contains the location of the
fiducial points (*mri.hdr.fiducial.mri *and *mri.hdr.fiducial.head*). Th
fiducial points are like these

[image: Inline image 1]
Clearly the lpa coordinate exceeds mri dimension and both nas and rpa
coordinates do not indicate these two positions. I am quite confused how I
can use the given information about the fiducial points. It would be of
great help if anyone could help me in this regards.

Thanks and Regards,
Susmita Sen
Research Scholar
Audio and Bio Signal Processing Lab.
E & ECE Dept.
IIT Kharagpur
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