3-D shape measurement endoscope using a single-lens system.

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Optical Measurement

Background:

• Current endoscopic techniques primarily capture surface texture, lacking crucial depth information.
• Integrating 3-D shape data with texture analysis can significantly improve the detection of abnormal tissues.
• A need exists for advanced endoscopic tools that provide comprehensive anatomical and textural insights.

Purpose of the Study:

• To propose and validate a novel three-dimensional (3-D) shape measurement endoscopic technique.
• To integrate depth information with conventional surface texture data for enhanced analytical capabilities.
• To develop a prototype endoscope capable of providing 3-D shape measurements for improved tissue analysis and detection of unusual tissues.

Main Methods:

• A shape-from-focus technique was employed for 3-D shape measurement.
• A single-lens system was utilized to achieve image focusing for both texture and 3-D shape acquisition.
• A prototype endoscope was constructed and tested for validation.

Main Results:

• The prototype endoscope successfully performed 3-D measurements on artificial objects with RMS errors of 0.87 mm (plate) and 0.64 mm (cylinder).
• In vitro experiments on a pig stomach inner wall demonstrated the feasibility of the proposed method for biological applications.
• The system proved efficient for 3-D measurement within practical endoscope size constraints.

Conclusions:

• The developed 3-D shape measurement endoscopic technique is effective and suitable for miniaturization due to its single-lens design.
• This technology offers a significant advancement over conventional endoscopes by providing crucial depth information.
• The integrated approach of texture and 3-D shape analysis holds promise for improved diagnostic capabilities in various medical fields.