A Wearable Capsule Endoscope Electromagnetic Localization System Based on a Novel WCL Algorithm

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Wireless Communication

Background:

• Wireless capsule endoscopy (WCE) offers potential for gastrointestinal diagnosis and treatment.
• Current electromagnetic localization accuracy in WCE requires improvement for clinical application.

Purpose of the Study:

• To develop a high-accuracy electromagnetic localization algorithm for wearable WCE systems.
• To enhance the precision of WCE positioning for improved gastrointestinal diagnostics.

Main Methods:

• Utilized a Received Signal Strength Indication (RSSI) electromagnetic fading model.
• Employed Kalman filter and least squares for parameter fitting.
• Proposed a novel weighted centroid localization (WCL) algorithm with exponential weights.

Main Results:

• Simulations demonstrated significant reductions in localization root mean square error (RMSE) compared to conventional methods (up to 79% reduction).
• Experimental results in a human phantom showed a 17% lower RMSE (36.3 mm) than the conventional algorithm.
• The proposed WCL algorithm achieved high accuracy with sparse reception matrices.

Conclusions:

• The novel WCL algorithm significantly improves WCE electromagnetic localization accuracy.
• The developed system meets the requirements for clinical gastrointestinal diagnosis.
• This advancement supports more effective and precise WCE-based medical interventions.