Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...

Endoscopic Procedures II: Colonoscopy

Endoscopic Procedures II: Colonoscopy

The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:

Assessment of the Rectum and Anus

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...

Uncertainty in Measurement: Accuracy and Precision

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Sparse Canonical Correlation Analysis for Multiple Measurements With Latent Trajectories.

Biometrical journal. Biometrische Zeitschrift·2025

Same author

Estimating overall survival of glioblastoma patients using clinical variables, tumor size, and location.

Neuro-oncology advances·2025

Same author

Identifying Predictors for Heart Failure Outcomes in Phospholamban p.(Arg14del)-Positive Individuals.

JACC. Heart failure·2025

Same author

Application of image guided analyses to monitor fecal microbial composition and diversity in a human cohort.

Scientific reports·2025

Same author

Aortic Function in a Longitudinal 4D Flow MRI Study in Marfan Syndrome Patients Receiving Resveratrol.

Journal of magnetic resonance imaging : JMRI·2025

Same author

Cohort Profile Update: The Healthy Life in an Urban Setting (HELIUS) Study.

International journal of epidemiology·2025

Search research articles

Related Experiment Video

Updated: Jun 17, 2026

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Published on: October 16, 2013

Polyp measurement based on CT colonography and colonoscopy: variability and systematic differences.

Ayso H de Vries¹, Shandra Bipat, Evelien Dekker

¹Department of Radiology, Academic Medical Centre, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands. Ayso.devries@amc.uva.nl

European Radiology

|December 25, 2009

Summary

Optical colonoscopy and CT colonography polyp measurements show differences. CT colonography techniques generally measured larger polyps with less variability than optical colonoscopy methods.

More Related Videos

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Published on: July 11, 2025

Related Experiment Videos

Last Updated: Jun 17, 2026

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Published on: October 16, 2013

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Published on: July 11, 2025

Area of Science:

Gastroenterology
Medical Imaging

Background:

Accurate polyp measurement is crucial for colorectal cancer screening and management.
Variability in polyp size assessment can impact clinical decisions.

Purpose of the Study:

To compare measurement variability and systematic differences between optical colonoscopy and CT colonography for polyps.
To evaluate different measurement techniques within each modality.

Main Methods:

Gastroenterologists measured polyps using visual estimation, forceps, and linear probe during optical colonoscopy.
CT colonography observers assessed polyp size using 2D and 3D techniques.
Linear mixed models analyzed measurement variability and differences.

Main Results:

Linear probe and forceps measurements showed comparable variability, both less variable than visual estimation.
CT colonography techniques demonstrated lower measurement variability than optical colonoscopy methods.
CT colonography consistently measured larger polyps compared to optical colonoscopy, with differences ranging from 0.7 to 2.3 mm.

Conclusions:

A linear probe did not improve endoscopist measurement variability over forceps.
CT colonography exhibited smaller inter-observer measurement differences than optical colonoscopy.
Polyps were generally perceived as larger with CT colonography techniques.