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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...
Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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:
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...
Imaging Studies VI: Voiding Cystourethrography and Cystography01:22

Imaging Studies VI: Voiding Cystourethrography and Cystography

Voiding Cystourethrography (VCUG) and Cystography are specialized radiographic procedures used to examine the structure and function of the bladder and urethra.Voiding Cystourethrography (VCUG)A Voiding Cystourethrogram (VCUG) is a diagnostic imaging procedure that assesses the anatomy and function of the lower urinary tract. It focuses on the bladder, bladder neck, and urethra, helping detect abnormalities such as vesicoureteral reflux (VUR)—the backward or reverse flow of urine into the...
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...

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Related Experiment Video

Updated: Jul 13, 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

Two- versus three-dimensional colon evaluation with recently developed virtual dissection software for CT

Se Hyung Kim1, Jeong Min Lee, Hyo Won Eun

  • 1Department of Radiology and Institute of Radiation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea.

Radiology
|August 22, 2007
PubMed
Summary

Three-dimensional (3D) virtual dissection for computed tomographic (CT) colonography offers similar polyp detection rates as traditional 2D methods but with faster interpretation times. This advanced technique shows promise for improving colon cancer screening efficiency.

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Published on: October 16, 2013

Area of Science:

  • Radiology
  • Gastroenterology
  • Medical Imaging

Background:

  • Colonic polyp detection is crucial for colorectal cancer screening.
  • Computed tomographic (CT) colonography is an alternative to conventional colonoscopy.
  • Interpretation of CT colonography data can be time-consuming.

Purpose of the Study:

  • To compare the interpretation time and polyp detection sensitivity of 2D versus 3D virtual dissection techniques in CT colonography.
  • To evaluate the diagnostic performance of 3D virtual dissection for colonic polyps.

Main Methods:

  • Retrospective study of 96 patients undergoing both colonoscopy and CT colonography.
  • Independent analysis of CT colonography data by two radiologists using 2D and 3D virtual dissection techniques.
  • Comparison of sensitivity and specificity using McNemar test; interpretation time was assessed.

Main Results:

  • Three-dimensional (3D) virtual dissection showed comparable per-polyp and per-patient sensitivity for detecting polyps ≥6 mm compared to 2D interpretation.
  • Per-patient specificity was also comparable between the 2D and 3D methods.
  • The 3D virtual dissection technique required significantly shorter interpretation time.

Conclusions:

  • Three-dimensional (3D) virtual dissection is a viable and efficient alternative for CT colonography interpretation.
  • This technique maintains diagnostic accuracy while reducing radiologist workload.
  • 3D virtual dissection may enhance the clinical utility of CT colonography for polyp detection.