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Related Concept Videos

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...
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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: May 29, 2026

Time-Resolved, Dynamic Computed Tomography Angiography for Characterization of Aortic Endoleaks and Treatment Guidance via 2D-3D Fusion-Imaging
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Improved aortic enhancement in CT angiography using slope-based triggering with table speed optimization: a pilot

Mustafa R Bashir1, Paul W Weber, Daniela B Husarik

  • 1Department of Radiology, Duke University Medical Center, Duke North, Room 1508F, Erwin Road, Durham, NC 27710, USA. mustafa.bashir@duke.edu

The International Journal of Cardiovascular Imaging
|September 8, 2011
PubMed
Summary
This summary is machine-generated.

A new slope-based triggering technique significantly improves arterial enhancement in CT angiography of the aorta. This method, combined with optimized table speed, offers better image quality than conventional threshold-based triggering, especially in challenging cases.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Cardiovascular Imaging

Background:

  • Conventional threshold-based triggering techniques in CT angiography can lead to suboptimal arterial enhancement.
  • Poor enhancement is particularly noted in scenarios with low cardiac output or aneurysmal aortas.
  • This technical limitation can impact diagnostic accuracy and increase the need for repeat scans.

Purpose of the Study:

  • To evaluate a novel scan triggering technique based on the time-attenuation curve slope.
  • To assess if combining slope-based triggering with table speed optimization enhances aortic CT angiography.
  • To compare this new method against conventional threshold-based triggering techniques.

Main Methods:

  • Physiologic flow phantom used to simulate cardiac outputs (2.2-8.1 L/min).
  • Contrast media boluses (80 and 150 mL at 4 mL/s) administered.
  • Computer models of aortic attenuation created using cardiac output, aortic diameter, and CT table speed; in-plane enhancement calculated for normal and aneurysmal aortas.

Main Results:

  • Threshold-based triggering resulted in poor arterial enhancement (<150 HU) in low cardiac output and aneurysmal aorta models.
  • Slope-based triggering with table speed optimization improved enhancement across all tested scenarios.
  • Good (>200 HU) to excellent (>300 HU) enhancement was achieved in 13/16 and 3/16 scenarios, respectively, with the new technique.

Conclusions:

  • Slope-based triggering combined with table speed optimization significantly enhances arterial opacification in aortic CT angiography.
  • This advanced technique offers superior performance compared to conventional threshold-based methods.
  • The improved enhancement may reduce technical failures associated with low flow states and aneurysmal conditions.