Steffi Valdeig1, Barry Fetics2, Li Pan, 1,3, Clifford R. Weiss1, Erez Nevo2, Dara L. Kraitchman1, Frank K. Wacker1
1Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, MD, United States; 2Robin Medical Inc., Baltimore, MD, United States; 3Center for Applied Medical Imaging, Siemens Corporation, Corporate Research, Baltimore, MD, United States
Purpose: To test the feasibility and accuracy of a tool that allows for interactive adjustments of the needle plane during a MR guided puncture Method: Experiments were performed in vivo and in phantoms using a gradient based navigation system for real time MR guided punctures in a wide bore MR imager. To assess for accuracy of the system the distance of the needle tip (virtual and real) to the target was determined on MR control scans. Result: The mean 3D total error was 4.9 2.8mm in the phantom. The system error was less than 2 mm. In the animal, successful punctures of the target structures could be confirmed in all punctures. Conclusion: The combination of image overlay with real time adjustment of the virtual needle and real-time imaging feedback provides an accurate and intuitive means to perform percutaneous interventions in a wide bore MR imager.