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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 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...

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Related Experiment Video

Updated: Jul 9, 2026

Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia
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Published on: December 19, 2020

Physiological associations of computerized tomography lung density: a factor analysis.

Suzanne Marsh1, Sarah Aldington, Mathew V Williams

  • 1Medical Research Institute of New Zealand, Wellington.

International Journal of Chronic Obstructive Pulmonary Disease
|December 1, 2007
PubMed
Summary

Computerized tomography (CT) density measurements for emphysema show strong links to airway disease, not just emphysema itself. These lung density metrics are more related to airflow obstruction and hyperinflation than gas transfer.

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Last Updated: Jul 9, 2026

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Medical Imaging

Background:

  • Computerized tomography (CT) density measurements are increasingly used for objective emphysema quantification.
  • However, the influence of abnormal lung function on CT density and its role in emphysema monitoring remain unclear.

Purpose of the Study:

  • To investigate the relationship between CT-derived lung density measurements and pulmonary function.
  • To determine if lung density accurately reflects emphysema or other airway diseases.

Main Methods:

  • CT scans were used to measure the proportion of low-density lung tissue in a large population sample (n=739).
  • Factor analysis was employed to study the association between these density measurements and detailed pulmonary function tests.

Main Results:

  • Lung density measurements correlated more strongly with measures of hyperinflation and airflow obstruction than with gas transfer measures.
  • The strongest associations were observed with factors representing airflow obstruction and hyperinflation.
  • A significant portion of lung density variation was not explained by lung function measurements.

Conclusions:

  • CT-derived lung density measurements are significantly associated with airway disease markers.
  • These measurements are not specific to emphysema and may reflect broader airway abnormalities.