The human heart is composed of a helical network of
muscle fibers organized to form sheets that are separated by cleavage
planes responsible for the orthotropic mechanical properties of
cardiac muscle. The purpose of this study is the reconstruction and
visualization of these structures in 3 dimensions.
Methods: Anisotropic least square filtering followed by fiber and
sheet tracking techniques were applied to diffusion tensor magnetic
resonance imaging data of the excised human heart. Fibers were
reconstructed using the first eigenvectors of the diffusion tensors.
The sheets were reconstructed using the second and third eigenvectors
and visualized as surfaces.
Results The fibers are shown to lie in sheets that have transmural structure, which correspond to histologic studies published in the literature. Quantitative measurements show that the sheets as appose to the fibers are organized into laminar orientations without dominant populations.
Conclusions A visualization algorithm was developed to demonstrate the complex 3-dimensional orientation of the fibers and sheets in human myocardium.
KeywordsCardiac Imaging, Diffusion Tensor MRI, Fiber Tracking, Laminar Structure.
ReferenceDamien Rohmer, Arkadiusz Sitek, Grant T. Gullberg.
Reconstruction and Visualization of Fiber and Laminar Structure in the Normal Human Heart from Ex Vivo DTMRI Data.
Investigative Radiology, 42(11), p.777-789.
Lawrence Berkeley National Laboratory Technical Report, LBNL-60277.
The published version of the article is available at http://journals.lww.com/
@ 2007 Lippincott Williams & Wilkins