Towards a Hall effect magnetic tracking device for MRI.

Area of Science:

• Biomedical Engineering
• Medical Imaging Technology
• Sensor Development

Background:

• Accurate instrument tracking is crucial for minimally invasive surgery.
• Existing tracking systems face challenges within Magnetic Resonance Imaging (MRI) environments.
• Developing MRI-compatible tracking solutions is a significant technological need.

Purpose of the Study:

• To present the first prototype of a magnetic tracking device specifically designed for MRI.
• To demonstrate the feasibility of sub-millimeter localization using magnetic field gradient measurements.
• To enable the integration of tracking systems into surgical tools for enhanced MRI-guided procedures.

Main Methods:

• Utilized the intrinsic relationship between MRI scanner bore coordinates and magnetic field gradients.
• Employed a miniaturized 3D Hall device (50µm²) for precise gradient measurement.
• Integrated the Hall device and conditioning circuit using a low-cost, low-voltage 0.35µm CMOS process.

Main Results:

• Achieved sub-millimeter localization accuracy in initial experiments.
• Demonstrated the functionality of the prototype magnetic tracking device within an MRI context.
• Validated the potential for low-cost, low-voltage CMOS integration.

Conclusions:

• The developed magnetic tracking device shows promise for MRI-guided surgery.
• Sub-millimeter accuracy opens avenues for advanced surgical tool integration.
• This technology represents a significant step towards practical MRI-compatible surgical navigation systems.