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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

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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:
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
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Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

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Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
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Endoscopic Procedures III: Video Capsule Endoscopy01:28

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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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Assessment of the Rectum and Anus01:25

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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.
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Endoscopic Procedures V: ERCP01:26

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Endoscopic Retrograde Cholangiopancreatography (ERCP) is a diagnostic procedure that combines endoscopy and fluoroscopy to diagnose and treat conditions related to the bile ducts, pancreatic ducts, and gallbladder. This procedure is beneficial for identifying and addressing blockages, gallstones, strictures, and tumors within the biliary or pancreatic systems. ERCP is both diagnostic and therapeutic, offering the ability to visualize and treat identified problems in one session.
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Related Experiment Video

Updated: Apr 12, 2026

E-Patient Counseling Trial E-PACO: Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
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Polyp-Alert: near real-time feedback during colonoscopy.

Yi Wang1, Wallapak Tavanapong1, Johnny Wong1

  • 1Department of Computer Science, Iowa State University, Ames, IA 50011, USA.

Computer Methods and Programs in Biomedicine
|May 9, 2015
PubMed
Summary

Polyp-Alert is a new software system that helps doctors find polyps during colonoscopies using visual feedback. It achieved 97.7% accuracy in detecting polyp shots, significantly aiding early detection.

Keywords:
ColonoscopyMedical imaging/videoNear Real-timePolyp detection

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Area of Science:

  • Medical Imaging
  • Computational Pathology
  • Gastroenterology

Background:

  • Colonoscopy is a key procedure for colorectal cancer screening.
  • Accurate polyp detection during colonoscopy is crucial for early cancer diagnosis and prevention.
  • Current methods rely heavily on endoscopist's visual acuity, which can be prone to errors.

Purpose of the Study:

  • To introduce Polyp-Alert, a novel software system designed to enhance polyp detection during colonoscopy.
  • To evaluate the efficacy and accuracy of Polyp-Alert in identifying polyps in real-world colonoscopy videos.

Main Methods:

  • Polyp-Alert utilizes edge-cross-section visual features and a rule-based classifier to detect polyp edges.
  • A polyp edge tracking mechanism groups sequential images of the same polyp, defining a 'polyp shot'.
  • The system was tested on 18 hours of video data from various colonoscope brands.

Main Results:

  • Polyp-Alert achieved a high detection rate, correctly identifying 97.7% of polyp shots (42 out of 43).
  • The system demonstrated a low false positive rate of 4.3% for the entire colonoscopy procedure.
  • The software provides real-time visual feedback at a rate of up to ten frames per second.

Conclusions:

  • Polyp-Alert shows significant promise as a tool to assist endoscopists in detecting more polyps during routine screening colonoscopies.
  • The system's high accuracy and low false positive rate suggest its potential to improve colonoscopy outcomes.
  • The extensible design of Polyp-Alert allows for adaptation to different colonoscope models, broadening its clinical applicability.