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Multiparametric Optical Mapping of the Langendorff-perfused Rabbit Heart
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Visualization of multidirectional regional left ventricular dynamics by high-temporal-resolution tissue phase

Daniela Föll1, Bernd Jung, Felix Staehle

  • 1Department of Cardiology and Angiology, University Hospital, Albert Ludwigs University Freiburg, Freiburg, Germany.

Journal of Magnetic Resonance Imaging : JMRI
|April 24, 2009
PubMed
Summary

High-temporal-resolution tissue phase mapping (TPM) reveals age-related changes in left ventricular (LV) motion. This technique identifies regional myocardial velocity differences in normal aging and dilated cardiomyopathy.

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Area of Science:

  • Cardiovascular imaging
  • Cardiac mechanics
  • Biomedical engineering

Background:

  • Understanding normal myocardial motion is crucial for diagnosing cardiac pathologies.
  • Previous methods lacked the spatiotemporal resolution to capture subtle regional dynamics.
  • Tissue phase mapping (TPM) offers a promising approach for detailed cardiac motion analysis.

Purpose of the Study:

  • To characterize normal regional myocardial motion across different age groups using high-temporal-resolution TPM.
  • To assess the utility of TPM in identifying pathological myocardial motion in dilated cardiomyopathy.
  • To establish a detailed representation of left ventricular (LV) function.

Main Methods:

  • Acquired myocardial velocities were transformed into radial, circumferential, and long-axis motion components.
  • A multisegment and multislice visualization model was used for comparing regional velocities.
  • Correlation analysis investigated regional differences in myocardial dynamics with high spatiotemporal resolution (1.3 x 2.6 x 8 mm³, 13.8 msec).

Main Results:

  • Significant age-related differences in peak and time-to-peak radial and long-axis velocities were observed.
  • Regional variations in the temporal evolution of long-axis and circumferential velocities were evident, especially between age extremes.
  • Pathological LV motion in dilated cardiomyopathy showed marked regional alterations in myocardial velocities compared to age-matched controls.

Conclusions:

  • High-temporal-resolution TPM, coupled with visualization and correlation analysis, effectively identifies local myocardial velocity changes.
  • This approach can distinguish age-related variations in myocardial motion.
  • TPM aids in detecting regional alterations associated with LV pathology like dilated cardiomyopathy.