[MINC-users] talairach volume and talairach center

[Yasunari Tosa]

Hi, MINC people

I'm very confused about the talairach coordinate system
and I would appreciate it very much if you could clarify.

My question:
Where is the talairach origin in the talairached volume?

I thought that average_305.mnc is the one aligned with
talairach map (the web page says that it can be directly
superimposed over the talairach atlas).  Thus I thought
that this is the "standard" talairached volume.

When I did 

	worldtovoxel average_305.mnc 0 0 0

returned non-trivial big values compared with the volume size.

    68.25 126.51000000000000512 86.094999999999998863

Here is the MINC linear map stored

MINC Linear Transform
      1.0000      0.0000      0.0000    -86.0950
      0.0000      1.0000      0.0000   -126.5100
      0.0000      0.0000      1.0000    -68.2500
      0.0000      0.0000      0.0000      1.0000

This means that the average_305 volume center is not the
talairach origin.

Is this a correct understanding?

Thank you.

Tosa