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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.
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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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Imaging Studies III: Computed Tomography01:27

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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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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: Nov 14, 2025

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Ischemic Core Overestimation on Computed Tomography Perfusion.

Álvaro García-Tornel1, Daniel Campos1, Marta Rubiera1

  • 1Stroke Unit, Department of Neurology (A.G.-T., D.C., M. Rubiera, S.B., M.O.-G., M. Requena, M.M., J.P., D.R.-L., M.D., J.J., N.R.-V., E.S., J.A.-S., C.A.M., M.Ribó), Hospital Vall d'Hebron, Departament de Medicina, Universitat Autònoma de Barcelona, Spain.

Stroke
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Poor collateral status and early imaging times increase the risk of overestimating ischemic core on CT perfusion (CTP) in stroke patients. These factors are crucial for accurate core assessment in endovascular therapy.

Keywords:
hemodynamicinfarctionischemic strokeodds ratioreperfusion

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • CT perfusion (CTP) may overestimate ischemic core volume in the early stages of stroke.
  • Understanding factors influencing this overestimation is critical for effective treatment.

Purpose of the Study:

  • To evaluate the impact of time and collateral status on ischemic core overestimation using CTP.
  • To identify predictors of CTP-derived ischemic core overestimation in stroke patients.

Main Methods:

  • Retrospective analysis of 407 patients with anterior circulation large-vessel stroke undergoing endovascular treatment.
  • Automated estimation of ischemic core and collateral status (hypoperfusion intensity ratio) on baseline CTP.
  • Comparison of CTP-derived core with final infarct volume measured on noncontrast CT at 24-48 hours.

Main Results:

  • Ischemic core overestimation occurred in 20% of patients.
  • Poor collateral status (OR, 1.41) and earlier onset-to-imaging time (OR, 1.14) were independently associated with overestimation.
  • The effect of collateral status on overestimation was more pronounced in patients imaged earlier.

Conclusions:

  • Poor collateral status and early imaging contribute to higher rates of ischemic core overestimation on CTP in stroke patients.
  • CTP reflects hemodynamic status, not definitive tissue fate; collateral status and time are key for interpretation.
  • Accurate assessment requires considering collateral status and time-to-imaging in CTP analysis for stroke patients.