george he wrote:

> rich,
> I would say AFNI is 1/2 pixel off in both in-plane directions
> (R-L and S-I in this case)
> if the information provided by dcdump is correct. The problem
> is that the
> <-105.707\94.3996\111.07> provides 2 coordinates of the
> outside of the corner voxel
> but 1 coordinate of the center of the corner voxel (plane
> position), and AFNI treats all
> 3 as at the center of the corner voxel.
> george

It certainly appears that that's how GE is using the (0020,0032)
field, when you compare it to their proprietary data, but that's
not how I read the DICOM standard:

----------------
C.7.6.2.1.1 Image Position and Image Orientation

The Image Position (0020,0032) specifies the x, y, and z coordinates of the
upper left hand corner of the image; it is the center of the first voxel
transmitted.
-----------------

Do you have any documentation on the GE usage of this attribute,
or of a convention among the MRI manufacturers to use this
attribute in that way? Before I start modifying that code, I'd really
like to have some idea of whether this is a special case or not.

rich