Related Experiment Video
Updated: Jun 11, 2026
07:03
Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
Published on: February 23, 2017
[Orientation of endoscopic images: rectification by gravity]
Kurt Höller1, Armin Schneider, Jasper Jahn
1Zentralinstitut für Medizintechnik und Lehrstuhl für Mustererkennung, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Deutschland. hoeller@zimt.uni-erlangen.de
Biomedizinische Technik. Biomedical Engineering
|July 1, 2010
Summary
A novel ENDOrientation system uses a MEMS inertial sensor to stabilize endoscopic images, improving surgical instrument coordination. This technology provides a stable horizon, making procedures more intuitive and efficient.
Area of Science:
- Medical Imaging
- Surgical Technology
- Sensor Technology
Context:
- Flexible video endoscopes often lack a stable horizon in endoscopic surgery images.
- Minimally invasive procedures, especially Natural Orifice Transluminal Endoscopic Surgery (NOTES), face orientation challenges.
- Maintaining a consistent visual reference is crucial for surgical precision.
Purpose:
- To develop and evaluate the ENDOrientation approach for real-time endoscopic image rectification.
- To assess the feasibility of using a MEMS tri-axial inertial sensor for determining endoscope rotation.
- To improve instrument coordination and intuitiveness in endoscopic surgery.
Summary:
- The ENDOrientation system utilizes a miniature MEMS inertial sensor on the endoscope tip to measure gravity's effect on orthogonal axes.
- Real-time data from the sensor, after calibration and filtering, allows for direct estimation of endoscope rotation angle with ~1-degree accuracy.
- The system achieves a sampling rate exceeding standard endoscopic video frame rates (25 Hz), enabling real-time digital image rectification.
Impact:
- Animal studies demonstrated significantly more intuitive coordination and instrument movement with a stable endoscopic horizon.
- The technology enhances the usability of flexible endoscopes in complex surgical scenarios.
- Provides a foundation for improved visual feedback and control in advanced endoscopic interventions.
Related Concept Videos
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:12Adjusting a Traverse
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...