Quantitative tagged magnetic resonance imaging of the normal human left ventricle

Christopher C. Moore, Elliot R. McVeigh, Elias A. Zerhouni

Research output: Contribution to journalReview article

Abstract

Magnetic resonance imaging with tissue tagging is a noninvasive technique for measuring three-dimensional motion and deformation in the human heart. Tags are regions of tissue whose longitudinal magnetization has been altered before imaging so that they appear dark in subsequent magnetic resonance images. They then move with the underlying tissue and serve as easily identifiable landmarks within the heart for the detailed detection of motion. Many different motion and strain parameters can be determined from tagged magnetic resonance imaging. Strain components that are based on a high density of tag data, such as circumferential and longitudinal shortening, or parameters that are combinations of multiple strain components, have highest measurement precision and tightest normal ranges. The pattern of three-dimensional motion and strain in the heart is important clinically, because it reflects the basic mechanical function of the myocardium at both local and global levels. Localized abnormalities can be detected and quantified if the pattern of deformation in a given heart is compared to the normal range for that region, because normal motion and strain in the left ventricle is spatially heterogeneous. Contraction strains typically are greatest in the anterior and lateral walls and increase toward the apex. The direction of greatest contraction lies along a counter clockwise helix from base to apex (viewed from the base) and approximates the epicardial muscle fiber direction. This fiber geometry also results in long-axis torsion during systole. Ejection is accomplished primarily by radially inward motion of the endocardium and by descent of the base toward the apex during systole.

Original languageEnglish (US)
Pages (from-to)359-371
Number of pages13
JournalTopics in Magnetic Resonance Imaging
Volume11
Issue number6
DOIs
StatePublished - Dec 1 2000

Keywords

  • Human heart
  • Magnetic resonance imaging
  • Three-dimensional strain
  • Tissue tagging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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