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Related Concept Videos

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...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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...
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 for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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...

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Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
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Effect of computer-aided detection as a second reader in multidetector-row CT colonography.

Thomas Mang1, Philipp Peloschek, Christina Plank

  • 1Department of Radiology, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. thomas.mang@meduniwien.ac.at

European Radiology
|March 14, 2007
PubMed
Summary

Computer-aided detection (CAD) significantly improves polyp detection sensitivity for nonexpert radiologists in computed tomographic colonography. While CAD enhances lesion identification, its value in detecting cancer is limited, with a modest increase in reading time.

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Time-Resolved, Dynamic Computed Tomography Angiography for Characterization of Aortic Endoleaks and Treatment Guidance via 2D-3D Fusion-Imaging
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Time-Resolved, Dynamic Computed Tomography Angiography for Characterization of Aortic Endoleaks and Treatment Guidance via 2D-3D Fusion-Imaging
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Published on: December 9, 2021

Area of Science:

  • Radiology
  • Medical Imaging
  • Gastroenterology

Background:

  • Computed tomographic colonography (CTC) is a key tool for colorectal cancer screening.
  • The effectiveness of CTC relies on accurate polyp detection.
  • Computer-aided detection (CAD) systems aim to improve diagnostic performance.

Purpose of the Study:

  • To evaluate the impact of CAD as a second reader on lesion detection in CTC.
  • To compare the influence of CAD on radiologists with varying levels of expertise.

Main Methods:

  • Retrospective review of 52 CTC datasets by four radiologists (two expert, two nonexpert).
  • Readers performed primary readings, followed by a second reading with CAD assistance.
  • Sensitivity and reading time were assessed with and without CAD.

Main Results:

  • CAD significantly improved polyp detection sensitivity for nonexpert readers (from 75-76% to 91-95%, P < 0.01).
  • Expert reader sensitivity increased slightly with CAD (91% to 93-96%), but not significantly.
  • All cancers were detected by readers; CAD alone detected only 43% of cancers.
  • Mean reading time increased by 2.1 minutes with CAD.

Conclusions:

  • CAD as a second reader substantially enhances polyp detection sensitivity, particularly for nonexpert radiologists in CTC.
  • CAD offers limited benefit for cancer detection in CTC.
  • The use of CAD in CTC is associated with a minor increase in examination time.