Enhancing positional accuracy of a pneumatically driven MR-Safe robotic arm for MRI-guided needle insertions

Accurate biopsy is vital for treating cancers like breast and prostate cancer, where MRI offers the best imaging quality. However, the MRI’s intense magnetic field prevents the use of standard metal robots, requiring specialized alternatives to improve clinical procedures.

The Manipulator Arm for MRI (MAMRI) is a 3D-printed, pneumatically driven robotic system designed to position needles during MRI-guided interventions. It aims to reduce procedure times and enhance targeting accuracy through remote-controlled operation. The latest version, the MAMRI 457, features a redesign of the kinematics and gear mechanism to make the robot significantly stiffer to improve accuracy. Another key improvement is the addition of absolute position sensors, which can track the robot’s position in real-time to detect and compensate for errors in the robot’s movement.