We present a software package for the manipulation of multi-modality d
igital images for computer assisted stereotactic neurosurgery. Stereot
actic neurosurgery uses imaging data to guide a surgical instrument to
reach an intracerebral target through a small bore-hole in the skull.
Besides the specific requirements for image acquisition, we discuss t
he different functions of the package: image transfer, geometric calib
ration of CT, MR and DSA, user interfacing and display modalities (mul
ti-planar reslicing, angiographic projections). We finally demonstrate
the improved functionality by reporting on some typical clinical case
s for functional neursurgery and stereotactic biopsies.