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This study introduces a robotic ultrasound system that uses a hybrid active-passive force control to maintain consistent probe contact. This innovation enhances ultrasound imaging stability and repeatability, aiding medical professionals.

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Area of Science:

  • Medical Imaging
  • Robotics
  • Control Systems

Background:

  • Ultrasound scanning is a crucial, radiation-free diagnostic tool for soft tissue imaging.
  • Operator-dependent contact force in manual ultrasound leads to inconsistent image quality and instability.
  • Existing systems lack robust solutions for maintaining constant probe-tissue interaction.

Purpose of the Study:

  • To develop and evaluate a robotic ultrasound scanning system with a constant-force end-effector.
  • To address the challenge of operator variability in achieving stable ultrasound imaging.
  • To improve the repeatability and ease of use in ultrasound examinations.

Main Methods:

  • Implementation of a novel hybrid active-passive force control strategy for the end-effector.
  • Integration of a passive mechanism for force buffering and an active system for positioning.
  • Experimental validation using silicone models and human volunteers.

Main Results:

  • The robotic system successfully maintained a constant contact force between the ultrasound probe and varying surfaces.
  • High repeatability in obtaining qualified ultrasound images was demonstrated.
  • Ease of operation for the robotic ultrasound scanning system was verified.

Conclusions:

  • The proposed robotic ultrasound scanning system offers a stable and repeatable imaging solution.
  • The hybrid force control approach effectively manages contact force variations.
  • This technology presents a promising advancement for assisting clinicians in performing ultrasound examinations.