Camera augmented mobile C-arm (CAMC): calibration, accuracy study, and clinical applications.

Area of Science:

• Medical Imaging
• Surgical Navigation
• Orthopedic Surgery

Background:

• Mobile C-arms are crucial in trauma and orthopedic surgery.
• Minimally invasive techniques using X-ray imaging and navigation enhance accuracy and reduce trauma.
• Current navigation systems often require additional hardware and introduce line-of-sight constraints.

Purpose of the Study:

• To augment a mobile C-arm with a camera and mirror system for real-time optical and X-ray image fusion.
• To evaluate the technical accuracy and clinical efficiency of this augmented system.
• To demonstrate its utility in specific orthopedic procedures like pedicle screw placement.

Main Methods:

• Augmenting a mobile C-arm with a standard video camera and a double mirror system.
• Implementing a one-time calibration routine for coregistering X-ray and optical images.
• Conducting cadaver studies with trauma surgeons to assess system performance.

Main Results:

• The system achieves accurate, real-time fusion of optical and X-ray images.
• Surgical guidance accuracy of less than 1 mm was achieved, particularly with a single X-ray image.
• The augmented C-arm system demonstrated intuitive and robust guidance for procedures like pedicle screw placement and vertebroplasty.

Conclusions:

• The camera-augmented mobile C-arm system provides an intuitive and accurate guidance solution.
• It integrates smoothly into clinical workflows with no additional hardware requirements.
• The system enhances minimally invasive surgical procedures in trauma and orthopedics.