Motorized capsule for shadow-free OCT imaging and synchronous beam control

Area of Science:

• Medical Imaging
• Gastroenterology
• Biomedical Engineering

Background:

• Optical coherence tomography (OCT) is a valuable imaging modality for visualizing subsurface tissue structures.
• Traditional OCT systems for esophageal imaging can be limited by artifacts, such as motor wire shadowing.
• Developing advanced endoscopic tools is crucial for improving diagnostic capabilities in the esophagus.

Purpose of the Study:

• To demonstrate a novel tethered motorized capsule for unobstructed OCT imaging of the esophagus.
• To address and mitigate common artifacts encountered in esophageal OCT.
• To evaluate the functionality of different beam-scanning modes for enhanced imaging.

Main Methods:

• Development of a tethered motorized capsule with a distal reflector design to eliminate motor wire shadow artifacts.
• Implementation of a synchronous driving technique enabling three distinct beam-scanning modes: circumferential, localized, and accurate positioning.
• Characterization of the capsule's scanning modes and ex vivo imaging experiments.

Main Results:

• The distal reflector design successfully prevented the shadow artifact caused by motor wires.
• The synchronous driving technique allowed for versatile beam-scanning capabilities.
• Ex vivo imaging demonstrated the capsule's effectiveness in capturing detailed esophageal tissue information.

Conclusions:

• The developed tethered motorized capsule offers an effective solution for artifact-free esophageal OCT imaging.
• The capsule's advanced scanning modes enhance its utility for diagnostic purposes.
• This technology shows promise for OCT-guided biopsy and therapeutic interventions in the esophagus.