Fig. 3From: Application accuracy of a frameless optical neuronavigation system as a guide for craniotomies in dogsFused pre- and postoperative CT datasets of a canine skull. (A) Transverse CT image of a canine skull. The white arrow mark one of the drill holes in the region for the access to the cerebrum. (B) Sagittal CT image of a canine skull. The two white arrows mark two drill holes in the region for the access to the pituitary glandBack to article page