Real-time automatic tracking with a dedicated 3D Hall-effect integrated circuit for MRI-guided interventions

A 3D Hall sensor integrated circuit and its localization algorithm were designed for gradient-based localization of interventional instruments during MR-guided procedure. Dedicated bipolar gradients and synchronization signal were implemented in a multi-slice real-time interactive spoiled gradient echo sequence. The localization algorithm is based on a linear model of the gradient coil fields identified during a calibration procedure. Based on the calculated pose, two orthogonal slices are aligned in real-time on the main axis of the device. A position accuracy of 2 mm is achieved and free-hand motion is monitored. This integrated circuit 3D probe could be integrated inside surgical instruments.

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