NDLI: Myofiber orientation in the normal and infarcted heart, assessed with MR-diffusion tensor imaging

Content Provider	IEEE Xplore Digital Library
Author	Geerts-Ossevoort, L. Bovendeerd, P. Prinzen, F. Arts, T. Nicolay, K.
Copyright Year	2001
Description	Author affiliation: Dept. of Mech. Eng., Eindhoven Univ. of Technol., Netherlands (Geerts-Ossevoort, L.)
Abstract	Cardiac fiber orientation is one of the main determinants of fiber stress and strain during ejection. We measured fiber orientation using magnetic resonance diffusion tensor imaging (MR-DTI). Traditional methods to quantify the cardiac fiber field rely on the definition of the coordinate system. We propose to use the entity 'divergence' for characterization of the continuity of the myocardial fiber structure. The divergence is a scalar quantity with a value that is independent of the actual choice of the coordinate system. Moreover, the divergence value of the fiber field expresses the degree of uniformity of stress along the fiber direction. The divergence of the myofiber field appeared to be <0.08 mm/sup -1/ in the mid-wall for all normal hearts. At the insertion sites of the papillary muscles and the anterior RV (right ventricle) fusion site, the divergence of the fiber field is elevated to values above 0.3 mm/sup -1/. In the infarcted hearts, divergence values in the unaffected tissue are similar to the values observed in healthy hearts. In and adjacent to the infarcted region, no significant differences in the divergence values were observed. This indicates that continuity of the fiber structure remains preserved in the presence of a transmural myocardial infarction.
Starting Page	621
Ending Page	624
File Size	360311
Page Count	4
File Format	PDF
ISBN	0780372662
ISSN	02766547
DOI	10.1109/CIC.2001.977732
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-09-23
Publisher Place	Netherlands
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart Tensile stress Animals Myocardium Muscles Thorax Arteries Mechanical engineering Biomedical engineering Physiology
Content Type	Text
Resource Type	Article

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