Hello Marie:

When you do maxmove compensation, did you turn off the automatic bad
channel detection? Sometimes this will help.

If this does not help, you can replace the digitized points (please
contact software support to get the executive), then recalculate the
transformation matrix, then copy the new transformation matrix to the
old file.

Best,

Tao



Marie Smith wrote:
> Hi,
>
> I was wondering if anyone could suggest how to go about changing the
> stored HPI coil positions from digitisation in a continuous fif data file?
>
> We recently recorded a data set in which the digitized coil location of
> one coil is incorrect and this causes HPI fitting in maxfilter to fail
> (the coil fits are fine, just the distances are too big 80-100mm). I've
> tried maxfiltering with the -hpicons tag, and although this tried to
> correct the deviant coil position, the HPI fits still fail. Luckily, we
> re-digitised the positions of the coils after recording and would like to
> use these correct coil location points in the original raw file. Does
> anyone know if how to go about doing this? Or is there is any way to tell
> maxfilter to ignore the one coil location thats incorrect and work with
> the other three?
>
> Any advice and/or suggestions would be greatly appreciated.
>
> Thanks,
>
> Marie
>
>
>
>


--
=============================================
Tao Song, PhD
MEG Application Specialist,
Elekta
Tel: (858)534-1298 (Office), (770)300-9725 ext 3170 (work),
     (858)699-7225 (cell)
Email: [log in to unmask]