Interoperative Biopsy Site Relocalization in Endoluminal Surgery

Area of Science:

• Gastroenterology
• Medical Devices
• Surgical Navigation

Background:

• Barrett's esophagus, a premalignant condition, is increasing, necessitating accurate biopsy site tracking for effective management.
• Current methods for localizing biopsy sites during endoscopy present significant challenges for treatment and monitoring.
• Real-time tracking is crucial for interoperative guidance and accurate disease progression assessment.

Purpose of the Study:

• To develop and evaluate an electromagnetic tracking system for guided navigation and relocalization of esophageal biopsy sites.
• To enhance the precision of identifying previously biopsied locations during endoscopic procedures.
• To improve targeted treatment delivery and disease progression monitoring in Barrett's esophagus patients.

Main Methods:

• Integration of an electromagnetic sensor at the flexible endoscope tip for real-time depth computation.
• System setup and methodology for interoperative registration using synthetic and in vivo data.
• Three incremental experiments: synthetic data analysis, in vivo pig data validation, and expert-evaluated biopsy site relocalization task.

Main Results:

• Synthetic data analysis demonstrated system error bounds within realistic noise models.
• In vivo pig data showed accuracy consistent with synthetic experiments, despite motion uncertainties.
• Expert evaluation confirmed a significant improvement in biopsy site retrieval rate from 47.5% to 94%.

Conclusions:

• The proposed electromagnetic tracking system offers effective guided navigation and biopsy site relocalization.
• The system demonstrates high accuracy and reliability, validated through rigorous experimental testing.
• This technology has the potential to significantly enhance the management of Barrett's esophagus.