Scholarlink

Objective <p>To present a wireless, batteryless, and optically powered two-dimensional (2D) electro-mechanical positioner operable inside a 3&#xa0;T MRI scanner.</p> Methods <p>The system uses Lorentz force actuators, each comprising a coil connected to a monocrystalline silicon solar cell, leveraging the scanner’s strong <i>B</i><sub>0</sub> field. Six actuators form a rotor; two rotors are used to construct the 2D positioner using plastic, glass, and ceramic parts for MRI compatibility. The rotor is modeled using circuit-based analytical and numerical simulations, incorporating the solar cell’s nonlinear current–voltage behavior. A custom coil is designed for 3&#xa0;T to maximize mechanical power.</p> Results <p>Experimental validation includes dynamic torque measurements inside a 53&#xa0;mT home-made desktop Helmholtz coil. The clinical-grade 3&#xa0;T MRI scanner experiments demonstrate successful positioning in <i>X</i> and <i>Y</i> directions via remote laser diode control and power transmission through fiber optic cables. The rotor achieves 150 rotations per minute and 3.4&#xa0;mN∙m torque at 6.3&#xa0;mW/mm<sup>2</sup> optical intensity, amplified to 194&#xa0;mN∙m by the gear train. The positioner attains a linear velocity of 2.2&#xa0;mm/s with an open-loop accuracy of 1.5&#xa0;mm, verified using MR images. The system shows stable behavior without imaging artifacts during in-scanner operation.</p> Conclusion <p>This is the first demonstration of a remotely controlled, optically powered 2D positioner operating wirelessly inside a clinical 3&#xa0;T MRI. It enables precise marker placement or mechanical stimulation and can be extended to 5 degrees of freedom for MRI-guided interventions such as biopsies.</p>

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Wireless and batteryless two-dimensional opto-electro-mechanical positioner inside 3 T MRI scanner

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Senol Mutlu,
  • Ahmet Akif Kaya,
  • Mert Yazgan,
  • Sabri Şirolu,
  • Aslı Mutlu,
  • Mahmut Beşer

摘要

Objective

To present a wireless, batteryless, and optically powered two-dimensional (2D) electro-mechanical positioner operable inside a 3 T MRI scanner.

Methods

The system uses Lorentz force actuators, each comprising a coil connected to a monocrystalline silicon solar cell, leveraging the scanner’s strong B0 field. Six actuators form a rotor; two rotors are used to construct the 2D positioner using plastic, glass, and ceramic parts for MRI compatibility. The rotor is modeled using circuit-based analytical and numerical simulations, incorporating the solar cell’s nonlinear current–voltage behavior. A custom coil is designed for 3 T to maximize mechanical power.

Results

Experimental validation includes dynamic torque measurements inside a 53 mT home-made desktop Helmholtz coil. The clinical-grade 3 T MRI scanner experiments demonstrate successful positioning in X and Y directions via remote laser diode control and power transmission through fiber optic cables. The rotor achieves 150 rotations per minute and 3.4 mN∙m torque at 6.3 mW/mm2 optical intensity, amplified to 194 mN∙m by the gear train. The positioner attains a linear velocity of 2.2 mm/s with an open-loop accuracy of 1.5 mm, verified using MR images. The system shows stable behavior without imaging artifacts during in-scanner operation.

Conclusion

This is the first demonstration of a remotely controlled, optically powered 2D positioner operating wirelessly inside a clinical 3 T MRI. It enables precise marker placement or mechanical stimulation and can be extended to 5 degrees of freedom for MRI-guided interventions such as biopsies.