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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Imaging Studies for Cardiovascular System IV: CMRI01:21

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Imaging Studies for Cardiovascular System V: CT01:28

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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 for Cardiovascular System III: X-Ray01:20

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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
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An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
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Imaging Studies VII: Vascular Imaging01:19

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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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Blood Flow01:29

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Related Experiment Video

Updated: Jan 14, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
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Coronary Artery Blood Flow Imaging Using 3D Flow MRI.

Denise Lichthardt1,2, Michaela Schmidt2, Jens Wetzl2

  • 1Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.

Magnetic Resonance in Medicine
|October 23, 2025
PubMed
Summary

This study introduces a 3D phase contrast MRI technique for simultaneous 3D blood flow velocity and morphology imaging in coronary arteries. This non-invasive method shows promise for diagnosing and monitoring coronary artery disease (CAD).

Keywords:
cardiovascular magnetic resonance angiographycoronary artery diseasecoronary imagingflow imagingphase contrast MRI

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Area of Science:

  • Cardiovascular Imaging
  • Magnetic Resonance Imaging
  • Biomedical Engineering

Background:

  • Accurate assessment of coronary artery blood flow is crucial for diagnosing coronary artery disease (CAD).
  • Traditional methods for evaluating coronary blood flow can be invasive or lack comprehensive spatial and temporal resolution.
  • 3D Phase Contrast (PC) Magnetic Resonance Imaging (MRI) offers a non-invasive approach to visualize blood flow dynamics.

Purpose of the Study:

  • To present a novel 3D Phase Contrast (PC) MRI technique for simultaneous, multi-directional blood flow velocity measurements.
  • To cover the proximal left (LCA) and right (RCA) coronary arteries, providing both morphological and hemodynamic information.
  • To enable non-invasive assessment of coronary blood flow for improved CAD diagnosis and monitoring.

Main Methods:

  • Acquisition of isotropic 3D PC data in a single diastolic phase using respiratory gating and compressed sensing (acceleration factor 14).
  • Separate reference and flow-encoded scans to allow inter-scan motion correction via image co-registration.
  • Validation in a flow phantom and feasibility demonstration in 16 volunteers and 3 patients with known CAD, alongside CT angiography (CTA) and CT-FFR.

Main Results:

  • Good agreement between the proposed 3D PC method and 4D Flow MRI in phantom experiments.
  • Mean average velocities in volunteers: 11.9 ± 3.3 cm/s (LCA) and 8.4 ± 2.6 cm/s (RCA).
  • In patients, increased velocities correlated with stenosis locations and reduced CT-FFR values, indicating clinical relevance.

Conclusions:

  • Demonstrated feasibility of 3D-PC-MRI for non-invasive 3D blood flow velocity imaging in the coronary arteries.
  • Simultaneous high-resolution morphology and velocity acquisition provides valuable data for CAD assessment.
  • This technique holds potential for enhanced diagnosis and monitoring of coronary artery disease.