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Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers,...

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Related Experiment Video

Updated: Dec 21, 2025

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Compact wide-angle capsule endoscopic lens design.

Sehui Chang, Dongmok Kim, Hyuk-Sang Kwon

|May 14, 2020

Summary

This summary is machine-generated.

This study presents a compact wide-angle lens for capsule endoscopy, improving image quality and reducing endoscope size. The new lens design offers a wide field of view and high resolution for better diagnostic imaging.

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Area of Science:

Optical Engineering
Medical Imaging Devices

Background:

Capsule endoscopes need high-quality imaging (wide field of view, brightness, resolution) for diagnostics.
Wide-angle lens designs often lead to larger first elements, hindering miniaturization.

Purpose of the Study:

To develop a compact wide-angle lens for capsule endoscopes.
To enhance image quality and reduce lens size for improved diagnostic capabilities.

Main Methods:

Utilized all-aspheric surfaces for optical aberration control.
Designed a lens system with a compact first element diameter.

Main Results:

Achieved a wide field of view (160 degrees) and F-number of 2.8.
Maintained a total track length of 5 mm with over 60% relative illumination across the field of view.
Demonstrated a modulation transfer function over 30% at 180 lp/mm for a 1920x1080 CMOS sensor.

Conclusions:

The proposed compact wide-angle lens design successfully improves image quality and reduces size for capsule endoscopes.
This advancement facilitates better diagnostic information capture in minimally invasive procedures.