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Segmental biventricular analysis of myocardial function using high temporal and spatial resolution tissue phase

Marius Menza1, Daniela Föll2, Jürgen Hennig3

  • 1Department of Radiology, Medical Physics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Breisacher Straße 60a, 79106, Freiburg, Germany. marius.menza@uniklinik-freiburg.de.

Magma (New York, N.Y.)
|November 17, 2017
PubMed
Summary

Tissue phase mapping (TPM) was optimized for right ventricle (RV) analysis, enabling detailed biventricular assessment. This advanced technique accurately measures RV myocardial velocities, aiding in the detection of RV diseases.

Keywords:
Biventricular analysisPhase-contrast velocity mappingRight ventricleTissue Phase Mapping

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Area of Science:

  • Cardiovascular Imaging
  • Cardiac MRI
  • Myocardial Mechanics

Background:

  • Right ventricular (RV) dysfunction is critical in diseases like pulmonary hypertension.
  • Assessing RV function is challenging due to its unique geometry and thinner walls.
  • Tissue phase mapping (TPM) is established for left ventricular (LV) analysis but requires adaptation for the RV.

Purpose of the Study:

  • To adapt and optimize Tissue Phase Mapping (TPM) for accurate right ventricular (RV) motion analysis.
  • To enable detailed biventricular assessment of myocardial velocities.
  • To develop a reliable tool for diagnosing RV diseases.

Main Methods:

  • Acquired TPM measurements in 25 healthy volunteers using velocity-encoded, kt-accelerated parallel imaging.
  • Employed optimized navigator strategies and blood saturation for enhanced image quality.
  • Utilized a 10-segment RV model for post-processing and detailed biventricular myocardial velocity analysis.

Main Results:

  • Achieved high spatio-temporal resolution (1.0 x 1.0 x 6 mm³, 21.3 ms) for clear RV delineation and velocity measurement.
  • Demonstrated significant differences in global and segmental velocities, and time to peak velocities between the LV and RV.
  • Revealed complex RV myocardial motion patterns through segmental time to peak analysis.

Conclusions:

  • Optimized high spatio-temporal resolution TPM facilitates comprehensive biventricular myocardial motion analysis.
  • This technique offers a reliable method for describing and detecting conditions affecting both left and right ventricular function.
  • TPM provides valuable insights into RV mechanics, crucial for diagnosing and managing RV-related pathologies.