Abstract
Abstract. Wireless capsule endoscopy is an established medical application for the examination of the gastrointestinal tract. However, the robust and precise localization of these capsules is still in need of further scientific investigation. This paper presents an innovative differential magnetic localization method for capsule endoscopy to prevent interference caused by the geomagnetic field. The effect of changing the orientation of the capsule on the localization process was also examined. Simulations using COMSOL Multiphysics with the superimposed geomagnetic field were performed. The Levenberg–Marquardt algorithm was applied in MATLAB to estimate the position and orientation of the capsule. Comparing the proposed differential method with the absolute magnetic localization method under ideal conditions, the mean position and orientation errors were reduced by three orders in magnitude to less than 0.1 mm and 0.1∘ respectively. Even if sensor non-idealities are considered, the simulation-based results reveal that our proposed method is competitive with state-of-the-art geomagnetic compensation methods for static magnetic localization of capsule endoscopes. The achieved localization accuracy by applying the differential method is not dependent on the rotation of the localization system relative to the geomagnetic flux density under the made assumptions and the impact of the magnet orientation is neglectable. It is concluded that the proposed method is capable of preventing all interference whose components are approximately equal at all sensors with identical orientation.
Highlights
Wireless Capsule Endoscopy (WCE) is a promising medical procedure to aid in the diagnosis of gastrointestinal disorders
This study proposes an innovative differential magnetic method for a wearable localization system for capsule endoscopy that prevents interference from the geomagnetic field, which is not dependent on time and rotation relative to the geomagnetic flux density
This paper introduced an innovative differential localization method for WCE to make the localization robust against interference of the geomagnetic flux density
Summary
Wireless Capsule Endoscopy (WCE) is a promising medical procedure to aid in the diagnosis of gastrointestinal disorders. Inertial sensors are prone to drift error over time, since the average duration of a diagnosis with WCE is around 8 h, it is very challenging to apply this method on a wearable localization system To overcome these limitations, this study proposes an innovative differential magnetic method for a wearable localization system for capsule endoscopy that prevents interference from the geomagnetic field, which is not dependent on time and rotation relative to the geomagnetic flux density. This study proposes an innovative differential magnetic method for a wearable localization system for capsule endoscopy that prevents interference from the geomagnetic field, which is not dependent on time and rotation relative to the geomagnetic flux density This novel approach was first presented in a short abstract in Zeising et al (2020a) and optimized in Zeising et al (2020c). The simulation-based results are compared with state-of-the-art geomagnetic compensation methods for localization of capsule endoscopes
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
