A compact laser beam guidance system for interventional CT.

OBJECTIVE: We propose a simple, compact, and accurate light guidance system for interventional CT. MATERIALS AND METHODS: The system using intersecting laser beams is mounted on the CT gantry and ensures precise needle guidance even when the gantry is tilted. The device does not require additional software/hardware. RESULTS: Phantom simulations and clinical experiments have demonstrated an accuracy of +/- 1 degrees and +/- 1 mm. CONCLUSION: The laser guidance system for CT makes the intervention safer, faster, and more accurate.