Heterogeneous signal intensity in magnetic resonance images of hypertrophied left ventricular myocardium

Raphael Zahler, David Chelmow, John Gore, Kenneth Wilkens, Christopher Pope, H. Disk Sostman, Roderick Meese, Rosa Negro-Vilar, Robert J. Herfkens, Frans J. Wackers, Barry L. Zaret

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Left ventricular hypertrophy is associated with decreased longevity and often leads to congestive heart failure. An exploratory study of magnetic resonance imaging in human left ventricular hypertrophy was performed. First, 13 patients with left ventricular hypertrophy and 7 controls of similar ages were studied using electrocardiogramgated end-diastolic images. Visual inspection suggested that low-intensity zones were frequently found within the hypertrophied myocardium. To verify this observation, the images were processed with semi-automatic edge detection and a derivative-based tissue characterization algorithm, yielding tissue heterogeneity indices (THI-A and THI-V) which objectively measured the low-intensity zones. THI-A and THI-V were both significantly greater in left ventricular hypertrophy patients than in controls (THI-A: 0.111 vs 0.038, p = 0.009). THI was also significantly correlated with duration of disease and electrocardiographic abnormalities. To validate these initial findings prospectively, the same quantitative analysis was applied to magnetic resonance images of an additional 20 left ventricular hypertrophy patients and 12 controls from two institutions, using different imaging systems and different acquisition parameters. Again, THI was significantly greater in patients than in controls. Analysis of end-systolic images yielded similar results. In four dogs with left ventricular hypertrophy induced by aortic banding, THI showed a statistically significant increase as left ventricular hypertrophy developed. Hypertrophied myocardium thus shows reproducible differences from normal tissue with magnetic resonance imaging; hence, quantitative magnetic resonance tissue characterization may be useful in assessing pathologic changes in LVH.

Original languageEnglish (US)
Pages (from-to)517-528
Number of pages12
JournalMagnetic Resonance Imaging
Volume7
Issue number5
DOIs
StatePublished - 1989

Keywords

  • Image processing
  • Left ventricular hypertrophy
  • Magnetic resonance imaging
  • Tissue characterization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Radiology Nuclear Medicine and imaging
  • Structural Biology
  • Clinical Biochemistry
  • Biophysics

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