Lei Qin1, Panagiotis Vartholomeos2, Pierre Dupont2
1Dana-Farber Cancer Institute, Boston, MA, United States; 2Children's Hospital Boston, Boston, MA, United States
This paper presents a novel closed-loop controlled actuation technology for robotically assisted MRI-guided interventional procedures. Compact and wireless, the actuators are both powered and controlled by the MRI scanner. The principle of operation is based on one or more small ferromagnetic bodies embedded in the actuator that serves to convert the electromagnetic energy of the MR gradients into mechanical energy. A MR tracking sequence is performed to track the position of the needle in real-time for closed-loop control. A prototype was constructed, which showed accurate control of the needle.