Fiber-optic large-depth 3D chromatic confocal endomicroscopy.

Area of Science:

• Biomedical Optics
• Medical Imaging
• Gastroenterology

Background:

• Current endoscopy lacks sufficient resolution and imaging depth for early gastric cancer detection.
• Accurate diagnosis relies on detailed morphological information, often requiring invasive biopsies or labeling agents.

Purpose of the Study:

• To develop a label-free, large-depth, three-dimensional (3D) chromatic reflectance confocal endomicroscopy system.
• To overcome the limited imaging depth of conventional confocal microscopy for gastric tissue analysis.

Main Methods:

• Utilized a custom miniature objective lens with large chromatic focal shift and spherical aberration correction.
• Employed a 50,000-core fiber bundle for signal collection and a high-speed multi-pixel spectrometer for multi-depth detection.
• Integrated these components into a fiber-optic 3D chromatic reflectance confocal endomicroscopy system.

Main Results:

• Achieved 2.3 µm lateral resolution and an imaging depth of 570 µm (3D phantom) and 220 µm (tissue).
• Demonstrated a 1.5 Hz 3D volumetric frame rate.
• Successfully imaged ex vivo human gastric tissues, providing diagnostic morphological information without labeling.

Conclusions:

• The developed fiber-optic 3D chromatic confocal endomicroscopy offers significant potential for early gastric cancer diagnosis.
• The label-free, deep-imaging capability enhances morphological assessment of gastric tissues.
• This technology represents a promising advancement in endoscopic imaging for gastrointestinal disease detection.