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what kind of coordinate system ImageVis3D uses?

Or more to the point, I have some polygonal segmentations of tumors in 3D images, and I want them to appear in their proper place in 3D space in iv3d. What I care about is relative position of polygonal model to the image (I want some nice visualizations). From my attempts to achieve this, I would say you are not using "World Space" as recorded into the images. It would be useful if you implemented world coordinate system, but if not (or meanwhile) I would like to know which transformation should I apply to my polygonal surface (gray in the attached image, with vertices V1..V5) in iv3d in order to have it relate properly to scalar image.

In the attached jpeg, 2D image is highlighted in red, world's coordinate system is black and dataset's coordinate system is blue. Both DICOM images and NRRD record this information into their files. By the way, here are some DICOM datasets which do not convert properly to UVF (scaling is wrong, i.e. Z-spacing): http://www.cg.informatik.uni-siegen.de/People/Zukic/data/Downloads/DzZ.zip

Regards,

Dženan