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Related Concept Videos

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

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: Colonoscopy01:25

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:
Endoscopic Procedures III: Video Capsule Endoscopy01:28

Endoscopic Procedures III: Video Capsule Endoscopy

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, unexplained...
Lower GI Series: Barium Enema01:23

Lower GI Series: Barium Enema

A Barium Enema, or a lower GI series, is a specialized radiographic examination designed to visualize the lower gastrointestinal tract, specifically the colon and rectum. This procedure is instrumental in diagnosing various conditions such as colorectal cancer, polyps, diverticulosis, and inflammatory bowel disease.
Procedure Details
The examination begins by inserting a lubricated rectal tube into the patient's rectum to administer a radiopaque barium solution. The barium flow is carefully...
Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

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.
Sigmoidoscopy
Sigmoidoscopy is a diagnostic procedure that uses a flexible sigmoidoscope equipped with a light source and camera to examine the rectum and sigmoid colon. The procedure involves inserting the tube through the anus...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Related Experiment Video

Updated: May 25, 2026

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
03:43

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

Published on: July 11, 2025

CT colonography: Why? When? How?

C Ridereau-Zins1, F Pilleul, Y Gandon

  • 1Department of Radiology, CHU Angers, 4 rue Larrey, Angers cedex 9, France. caridereauzins@chu-angers.fr

Diagnostic and Interventional Imaging
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

Radiologic examination of the colon using CT scan enhances evaluation through distension. Two methods, water or gas (CO(2)), are used for distension, each with specific indications and preparation requirements for colon abnormalities.

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Area of Science:

  • Radiology
  • Gastroenterology
  • Medical Imaging

Background:

  • Optical colonoscopy is the standard for colon disease diagnosis.
  • CT scan-based radiologic examination is an emerging alternative.
  • Bowel distension is crucial for effective colon evaluation.

Purpose of the Study:

  • To describe radiologic colon examination techniques.
  • To outline indications for water and gas enema colonography.
  • To compare preparation and equipment needs for different methods.

Main Methods:

  • Distension of the colon using water or carbon dioxide (CO(2)).
  • Water enema colonography with intravenous contrast for suspected cancer or metastases.
  • Gas enema colonography (virtual colonoscopy) for polyp screening.

Main Results:

  • Water enema is indicated for colon cancer suspicion, liver metastasis discovery, and tumor staging.
  • Gas enema (virtual colonoscopy) is used for screening precancerous growths (polyps).
  • Water enema requires minimal preparation and no special equipment.
  • Gas enema requires bowel cleansing and specialized equipment/training.

Conclusions:

  • CT colonography offers distinct approaches for diagnosis and screening.
  • Method selection depends on clinical suspicion and lesion type.
  • Both water and gas distension techniques enhance visualization of mucosal and luminal abnormalities.