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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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...
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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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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...
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Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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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...
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Related Experiment Video

Updated: Dec 23, 2025

Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia
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Variable computed tomography appearances of COVID-19.

Zhan Ye Lim1, Hau Wei Khoo1, Terrence Chi Hong Hui1

  • 1Department of Diagnostic Radiology, Tan Tock Seng Hospital, Singapore.

Singapore Medical Journal
|April 22, 2020
PubMed
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Computed tomography (CT) can detect lung abnormalities in COVID-19 pneumonia, but initial diagnosis should rely on established assays. CT is best reserved for specific clinical scenarios to aid patient management.

Keywords:
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Area of Science:

  • Radiology
  • Infectious Diseases
  • Pulmonology

Background:

  • Standard COVID-19 diagnosis relies on upper respiratory tract viral nucleic acid detection.
  • This method may not identify infections confined to the lower airways.
  • Computed tomography (CT) has been explored as a diagnostic tool for COVID-19.

Observation:

  • A case series of virologically confirmed COVID-19 pneumonia is presented.
  • CT scans revealed diverse features including consolidation, ground-glass opacities, and subpleural reticular bands.
  • An anterior-posterior gradient of lung abnormalities, similar to acute respiratory distress syndrome, was noted.

Findings:

  • CT is sensitive in detecting lung parenchymal abnormalities associated with COVID-19 pneumonia.
  • Observed CT findings evolved over time in one patient, showing resolution of consolidation and development of bronchiectasis and fibrotic bands.
  • Specific CT patterns were identified, including consolidation with ground-glass opacities and ground-glass opacities with subpleural reticular bands.

Implications:

  • CT is not recommended for the initial diagnosis of COVID-19.
  • Chest CT interpretation should be correlated with symptom duration for accurate staging and management.
  • CT should be reserved for specific clinical indications in COVID-19 diagnosis and treatment planning.