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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Ultrasonography01:17

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...
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 Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
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X-ray Imaging01:24

X-ray Imaging

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Related Experiment Video

Updated: Jun 3, 2026

Laparoscopic Cholecystectomy with Indocyanine Green Fluorescence: Choledochoscopic Stone Extraction and Primary Duct Suture
04:02

Laparoscopic Cholecystectomy with Indocyanine Green Fluorescence: Choledochoscopic Stone Extraction and Primary Duct Suture

Published on: November 25, 2025

Contrast does not affect cholangioscope image quality.

Jeffrey Laczek1, Mark Flasar, Eric Goldberg

  • 1Gastroenterology Service, Department of Medicine, Walter Reed Army Medical Center, Washington, DC, USA.

Gut and Liver
|April 5, 2011
PubMed
Summary
This summary is machine-generated.

Peroral cholangioscopy image quality is not significantly affected by saline or contrast solutions. Endoscopists can use intraductal contrast for lesion localization during bile duct examination if necessary.

Keywords:
Bile ductsCholangiopancreatographyEndoscopesEndoscopic retrograde

Related Experiment Videos

Last Updated: Jun 3, 2026

Laparoscopic Cholecystectomy with Indocyanine Green Fluorescence: Choledochoscopic Stone Extraction and Primary Duct Suture
04:02

Laparoscopic Cholecystectomy with Indocyanine Green Fluorescence: Choledochoscopic Stone Extraction and Primary Duct Suture

Published on: November 25, 2025

Area of Science:

  • Gastroenterology
  • Endoscopy
  • Biliary Imaging

Background:

  • Peroral cholangioscopy enables direct visualization of the bile duct.
  • Optimizing image quality is crucial for diagnostic accuracy.

Purpose of the Study:

  • To compare image quality of peroral cholangioscopy using different concentrations of radiologic contrast solutions.
  • To evaluate the impact of saline versus contrast solutions on cholangioscopy image quality.

Main Methods:

  • The SpyGlass® cholangioscope system was used to capture images in solutions from 0% to 100% contrast.
  • A blinded panel of 9 experienced endoscopists rated image quality on a scale of 0-10.
  • Statistical analysis, including one-way ANOVA, was performed to assess differences in scores.

Main Results:

  • Mean image quality scores ranged from 6.9 (100% contrast) to 7.6 (saline).
  • The highest mean score was 7.8 with 70% contrast.
  • No statistically significant difference in image quality scores was observed across the tested solutions (p=0.414).

Conclusions:

  • While ex vivo study limitations exist, the findings suggest contrast use may not significantly alter image quality.
  • Intraductal contrast can be considered for lesion localization during peroral cholangioscopy when needed.