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Related Concept Videos

Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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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Motion Corrected Subspace Reconstruction With Navigators for Quantitative High-Resolution Spiral First-Pass

Quan Chen1, Junyu Wang1, Xitong Wang1

  • 1Department of Cardiovascular Medicine, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|December 16, 2025
PubMed
Summary

This study optimized cardiac MRI for clearer whole-heart perfusion imaging. The new method significantly reduces motion artifacts, improving image quality and quantitative results for better patient diagnosis.

Keywords:
CMRMOCO reconstructionspiral perfusion imagingsubspace reconstruction

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Area of Science:

  • Cardiovascular Magnetic Resonance Imaging
  • Medical Imaging Physics
  • Quantitative Perfusion Imaging

Background:

  • Motion artifacts are a major challenge in high-resolution whole-heart first-pass perfusion MRI.
  • Achieving motion-robust, quantitative imaging requires advanced acquisition and reconstruction techniques.
  • Optimizing spiral trajectories and motion correction is crucial for diagnostic accuracy.

Purpose of the Study:

  • To optimize spiral acquisition using a fixed-angle subspace navigator and golden angle trajectory.
  • To implement motion-corrected (MOCO) subspace reconstruction for improved image quality.
  • To enable motion-robust, quantitative high-resolution whole-heart first-pass perfusion imaging at 3T.

Main Methods:

  • Utilized a (1+7)-arm spiral acquisition with k-t golden angles and a fixed-angle navigator.
  • Incorporated non-rigid motion correction using estimated deformation fields into subspace reconstruction.
  • Evaluated performance in simulations, retrospective datasets, and prospective studies with visual grading and myocardial blood flow (MBF) calculation.

Main Results:

  • The navigator effectively captured cardiac motion and contrast dynamics.
  • Subspace-MOCO achieved superior visual scores compared to SENSE and L1-SENSE (4.6 vs 2.2 and 4.1).
  • Subspace-MOCO demonstrated improved boundary sharpness, edge sharpness, and quantitative metrics (NCC, NMI), with MBF values comparable to SENSE-MOCO.

Conclusions:

  • Navigator-guided MOCO subspace reconstruction significantly reduces respiratory motion artifacts.
  • This technique enables high-resolution, motion-corrected whole-heart quantitative spiral perfusion imaging.
  • The optimized method enhances diagnostic confidence and accuracy in cardiac MRI.