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Posture Tracking of Active Capsule Endoscopes Integrated with Magnetic Actuation Using Hall-Effect Sensors.

Junho Han1, Kim Tien Nguyen2, Eui-Sun Kim2

  • 1Department of Mechanical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.

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Summary

This study introduces a new method using external Hall Effect Sensors to track capsule endoscope position and orientation in real-time. This magnetic localization system enhances capsule endoscopy safety and accuracy without extra onboard sensors.

Keywords:
capsule endoscopyhall-effect sensormagnetic actuationmagnetic localizationposition and orientation estimation

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Robotics

Background:

  • Capsule endoscopy (CE) offers noninvasive gastrointestinal diagnostics.
  • Determining CE orientation within the stomach is challenging due to organ dynamics.
  • Current methods may require additional internal sensors or lack real-time feedback.

Purpose of the Study:

  • To develop a real-time system for estimating capsule endoscope position and orientation.
  • To enable 5-degree-of-freedom posture estimation using only the capsule's internal permanent magnet.
  • To create a unified magnetic actuation and localization framework for enhanced capsule endoscopy.

Main Methods:

  • Utilized an external array of Hall Effect Sensors (HES) to detect the magnetic field of an internal permanent magnet (PM).
  • Implemented a unified magnetic actuation and localization framework for simultaneous control and tracking.
  • Integrated sensor module and communication board with digital serial communication, eliminating analog-to-digital conversion.

Main Results:

  • Achieved real-time 5-degree-of-freedom posture estimation.
  • Demonstrated high accuracy with position error < 2 mm and angular error < 2° within a 60 mm sensing range.
  • Validated system effectiveness and reliability through repeated experiments under realistic conditions.

Conclusions:

  • The proposed PM-based magnetic localization system simplifies hardware and reduces power consumption compared to electromagnet systems.
  • This approach preserves capsule miniaturization and avoids thermal issues.
  • The system is feasible for compact, clinically applicable active capsule endoscopy, enhancing diagnostic capabilities.