Depth Control and UI for Camera Augmented Mobile C-arm

Abstract

A Camera Augmented Mobile C-Arm system aiming to reduce the amount of radiation has been introduced by Navab et al. [1]. It uses an optical imaging system rigidly attached to the gantry such that the optical and X-ray imaging geometry is identical. As an extension to their solution, an additional video camera is mounted in an orthogonal arrangement to the first video camera, providing the source data for an optical marker based tracking of the surgical tools. Exploiting the invariance of the cross ratio in projective geometry, the position of the tip of any previously measured surgical instrument can be estimated. This information is the used to augment a static x-ray image in realtime. Furthermore, a new, streamlined User Interface is implemented, allowing for quick and flexible deployment of the system in clinical studies.

Literature

[1] Navab, N., Mitschke, M., Bani-Hashemi, A.: Merging visible and invisible: Two camera-augmented mobile C-arm (CAMC) applications. In: Proc. IEEE and ACM Int’l Workshop on Augmented Reality, San Francisco, CA, USA (1999) 134–141