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To reduce magnetic field distortions in intra-operative magnetic resonance imaging (MRI) robots, researchers developed semi-custom piezoelectric actuators. Substituting metal parts with plastic significantly minimized MRI distortions, improving precision for robotic-assisted surgery.

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Area of Science:

  • Medical Imaging
  • Robotics
  • Materials Science

Background:

  • Intra-operative magnetic resonance imaging (MRI) combined with robotic manipulation offers precise, feedback-driven surgical procedures.
  • Non-ferromagnetic piezoelectric motors are suitable for MRI robots, but metal components cause magnetic field distortions.
  • Existing motors, even non-ferrous ones, introduce significant magnetic field distortions, impacting imaging quality.

Purpose of the Study:

  • To investigate the impact of metal content in piezoelectric motors on MRI magnetic field distortions.
  • To develop and evaluate semi-custom piezoelectric actuators with minimized conductive materials for MRI-guided robotic surgery.
  • To assess the effectiveness of substituting metal components with plastic equivalents in reducing MRI artifacts.

Main Methods:

  • Construction of semi-custom piezoelectric actuators with reduced conductive material content.
  • Substitution of several metal components with plastic equivalents in the actuators.
  • Measurement of magnetic field distortion using a grid of centroid points in a gelatin phantom.
  • Assessment of Root Mean Square (RMS) positional change and Signal-to-Noise Ratio (SNR) drop.

Main Results:

  • The metal motor caused significant magnetic field distortion, with RMS positional changes up to 4.91mm.
  • The plastic motor demonstrated substantially reduced distortion, with RMS positional changes of only 0.55mm.
  • No statistically significant difference in Signal-to-Noise Ratio (SNR) drop was observed between metal and plastic motors (p=0.36).

Conclusions:

  • Substituting metal components with plastic in piezoelectric actuators can significantly mitigate magnetic field distortions in MRI.
  • This modification improves the feasibility of using robotic manipulation in MRI-guided procedures.
  • The findings suggest a pathway for developing more MRI-compatible robotic surgical tools.