Related Experiment Video
Updated: Feb 8, 2026
07:24
Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
Published on: September 22, 2015
14.9K
Intraobserver and interobserver reliability of visible light spectroscopy during upper gastrointestinal endoscopy
Louisa J D van Dijk1,2, Twan van der Wel1, Desirée van Noord1,3
1a Department of Gastroenterology and Hepatology , Erasmus MC University Medical Center , Rotterdam , The Netherlands.
Expert Review of Medical Devices
|July 6, 2018
Summary
Visible light spectroscopy (VLS) shows fair to good observer reliability for detecting gastrointestinal ischemia. Intraobserver reliability is better than interobserver reliability, supporting VLS use in clinical practice.
Area of Science:
- Gastroenterology
- Medical instrumentation
- Endoscopy
Background:
- Visible light spectroscopy (VLS) measures mucosal oxygen saturation during upper endoscopy.
- This technique aids in the diagnosis of gastrointestinal ischemia.
Purpose of the Study:
- To evaluate the observer variability of VLS measurements.
- Assessing both intraobserver and interobserver reliability.
Main Methods:
- Prospective study with 24 patients undergoing upper endoscopy.
- Intraobserver variability tested by duplicate measurements by one endoscopist.
- Interobserver variability assessed by independent measurements from two endoscopists.
- Intraclass correlation coefficient (ICC) and clinical disagreement used for analysis.
Main Results:
- Excellent intraobserver reliability (ICC 0.77-0.84) with minimal clinical disagreement.
- Good interobserver reliability for the duodenal bulb (ICC 0.70).
- Fair interobserver reliability for the antrum (ICC 0.56) and duodenum (ICC 0.49) with higher disagreement rates.
Conclusions:
- VLS demonstrates fair to good observer reliability.
- Intraobserver reliability surpasses interobserver reliability.
- Findings support the clinical utility of VLS for identifying gastrointestinal ischemia.
Related Concept Videos
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
5.8K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
5.8K
01:29Reliability and Validity
14.1K
Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
14.1K
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
1.3K
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
1.3K
01:26Anatomy of the Gastrointestinal System
2.9K
The human digestive system is an intricate and essential network for nutrient absorption and waste elimination. It encompasses the gastrointestinal (GI) tract and several accessory organs.
Here's a detailed walkthrough of this complex system:
Here's a detailed walkthrough of this complex system:
2.9K
01:25Distribution Reliability and Automation
519
Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
519
01:35Light as Energy
96.0K
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
96.0K