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Related Concept Videos

X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...
Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:

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Related Experiment Video

Updated: May 12, 2026

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children
04:55

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children

Published on: September 11, 2018

Foreign bodies: radiopaque compared to what?

Mark Halverson1, Sabah Servaes

  • 1Department of Radiology, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA. halversonm@email.chop.edu

Pediatric Radiology
|April 12, 2013
PubMed
Summary

Radiopacity is not absolute but relative, influenced by surrounding materials and object characteristics. Understanding relative X-ray attenuation is crucial for interpreting foreign body radiographs.

Area of Science:

  • Medical Imaging
  • Radiology
  • Foreign Body Detection

Background:

  • Radiopacity is often oversimplified as a binary characteristic.
  • A nuanced understanding is vital for accurate foreign body work-up.
  • Current classifications of radiopaque and non-radiopaque materials lack fundamental accuracy.

Observation:

  • Twenty diverse foreign bodies were radiographed in varying water depths (0-10 cm).
  • Simulated varying tissue densities to assess radiographic appearance.
  • Observed progressive changes in object visibility with increasing water depth.

Findings:

  • All objects were visible in a dry environment.
  • Object appearance changed significantly with simulated tissue depth.
  • Radiopacity is influenced by object composition, size, shape, and orientation.

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Hybrid µCT-FMT imaging and image analysis
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Hybrid µCT-FMT imaging and image analysis

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Related Experiment Videos

Last Updated: May 12, 2026

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children
04:55

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children

Published on: September 11, 2018

Investigations on the Ga(III) Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue
11:22

Investigations on the Ga(III) Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue

Published on: August 17, 2016

Hybrid µCT-FMT imaging and image analysis
13:45

Hybrid µCT-FMT imaging and image analysis

Published on: June 4, 2015

Implications:

  • Radiopacity is a comparative, not absolute, property.
  • Accurate interpretation requires considering relative X-ray attenuation.
  • Enhanced contrast resolution understanding improves foreign body detection.