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Related Concept Videos

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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Related Experiment Video

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Quantification of Mouse Heart Left Ventricular Function, Myocardial Strain, and Hemodynamic Forces by Cardiovascular Magnetic Resonance Imaging
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Continuous Ventricular Volumetric Quantification in Patients with Arrhythmias using Real-Time 3D CMR-MOTUS.

Thomas E Olausson1, Maarten L Terpstra1, Rizwan Ahmad2

  • 1Computational Imaging Group for MRI Therapy & Diagnostics, Center of Image Sciences, University Medical Center Utrecht, Utrecht, the Netherlands.

Arxiv
|March 13, 2026
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Summary

A new 3D real-time cardiovascular magnetic resonance (CMR) method reconstructs motion fields for continuous volumetric assessment in patients with arrhythmias. This technique accurately quantifies beat-to-beat ejection fraction (EF), revealing hemodynamic impacts missed by conventional imaging.

Keywords:
ArrhythmiaBeat-to-beat variabilityEjection fractionFree-RunningMotion fieldsPremature ventricular contractionReal-TimeVolumetric quantification

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Area of Science:

  • Medical Imaging
  • Cardiovascular Dynamics
  • Biomedical Engineering

Background:

  • Conventional cardiovascular magnetic resonance (CMR) cine imaging uses beat averaging, which is unsuitable for arrhythmic patients due to motion artifacts and loss of functional data.
  • Real-time 2D imaging captures individual heartbeats but lacks the volumetric coverage needed for comprehensive analysis of cardiac dynamics during arrhythmias.

Purpose of the Study:

  • To develop and validate a 3D real-time motion-field reconstruction method for continuous volumetric assessment in patients with premature ventricular contractions (PVCs).
  • To enable beat-to-beat ejection fraction (EF) quantification in arrhythmic conditions using free-running CMR.

Main Methods:

  • Extended the CMR-MOTUS method to jointly reconstruct real-time 3D motion fields and a motion-corrected reference image from continuous, ungated, non-breath-held data.
  • Utilized a variable-density Cartesian OPRA trajectory for data acquisition.
  • Computed beat-to-beat EF by propagating a single segmentation through all reconstructed frames using the motion fields.

Main Results:

  • Phantom validation showed excellent agreement between reconstructed and ground truth EF.
  • In healthy volunteers, EF values were consistent with 2D references.
  • In PVC patients, EF distributions were bimodal, with lower EF during PVC beats, correlating with ECG-confirmed PVC episodes.

Conclusions:

  • 3D real-time motion-field reconstruction enables continuous, beat-to-beat volumetric quantification in patients with cardiac arrhythmias.
  • This method reveals functional heterogeneity obscured by conventional imaging techniques.
  • The derived bimodal EF distributions accurately represent the hemodynamic impact of PVCs, offering potential clinical utility for monitoring and treatment evaluation.