Fig. 1A–C.

(A) Transverse, (B) sagittal, and (C) coronal planes of a 3-D scan of the lumbar spine are being reconstructed of 100 single 2-D images. To acquire these images, the C-arm rotates 190° around the patient. The single images then are processed by the attached work station and the CT-like data set then is sent to the navigation system.