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Eur J Cardiothorac Surg 2006;29:S165-S177
© 2006 Elsevier Science NL

MRI myocardial motion and fiber tracking: a confirmation of knowledge from different imaging modalities

^a Option on Bioengineering, California Institute of Technology, Pasadena, CA, USA
^b Department of Anesthesiology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
^c Department of Surgery, Division of Cardiothoracic Surgery, David Geffen School of Medicine at UCLA, 10833 Le Conte Avenue, 62-258 CHS, Los Angeles, CA 90095-1741, USA
^d Department of Diagnostic Radiology, University Hospital Freiburg, Germany
^e Hospital de Mataro, Barcelona, Spain

Received 22 February 2006; accepted 27 February 2006.

^_* Corresponding author. Tel.: +1 310 206 1027; fax: +1 310 825 5895. (Email: gbuckberg{at}mednet.ucla.edu).

Objective: A helical configuration underlies the anatomy of cardiac structure, and a structure/function relationship is needed to determine if the ventricular myocardial band model defines this spatial relationship. This report explores how studies of velocity-encoded phase contrast magnetic resonance imaging (MRI) for myocardial motion and fiber tracking algorithms that imply fiber orientations can (a) quantify regional myocardial wall motion of the entire heart, (b) determine if these motion of implied fiber orientation link with the helical heart model, and (c) reveal if this new knowledge correlates with imaging information from other different imaging modalities. Methods: Accumulated left ventricular motion patterns that accurately differentiate radial (i.e. contraction and expansion), rotational (i.e. twisting and untwisting), and longitudinal (i.e. lengthening and shortening) motion components are correlated with structure/function data achieved by sonomicrometer crystals, echocardiography, corrosion casts, and MUGA recordings. Results: Acceleration fiber tracking to determine fiber orientation and cardiac motion during the ejection and rapid filling phases of the cardiac cycle corresponded to maximal force displayed by ultrasonic crystals placed into the angulation of the presumed functional units of the descending and ascending segments of the apical loop of the helical ventricular myocardial band, and motion by echocardiographic recordings. These integrated findings imply a favourable interaction of MRI with the myocyte orientation of the helical ventricular myocardial band. Conclusions: These composite findings indicate that phase contrast MRI techniques for high temporal resolution velocity mapping during cardiac motion and myocardial fiber tracking confirm other technologies, and centralize the capacity of MRI to link other imaging methods together relative to a single helical structural model. The close agreement amongst a spectrum of imaging studies provide a very powerful integration that transcends a single look; the same thing is observed by each component of global technology, thereby implying that the helical ventricular band is the structural basis for these functional changes.

Key Words: MRI myocardial motion • Fiber tracking • Helical ventricular myocardial band • Echocardiography • Sonomicrometer crystals • Radionuclide ventriculography • Corrosion casts • Isovolumic contraction

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