Supplemental Material for:
A High-Resolution Cardiovascular Magnetic Resonance Diffusion Tensor Map from Ex-vivo C57BL/7 Murine Hearts
S. Angeli1, N. Befera2, J.M. Peyrat3, E. Calabrese2, G.A. Johnson2, C. Constantinides1,4
In press, Journal of Cardiovascular Magnetic Resonance
Background: The complex cardiac fiber structural organization and spatial arrangement of cardiomyocytes in laminar sheetlets contributes greatly to cardiac functional and contractile ejection patterns. This study presents the first comprehensive, ultra-high resolution, fully quantitative statistical tensor map of the fixed murine heart at isotropic resolution of 43 microns using diffusion tensor (DT) cardiovascular magnetic resonance (CMR).
Methods: Imaging was completed in approximately 12 hours using a 6-directional encoding scheme, in 5 ex vivo healthy C57BL/6 mouse hearts. The tensor map constructed from this data provides an average description of the murine fiber architecture visualized with fiber tractography, and its population variability, using the latest advances in image tensor analysis and statistics.
Results: Results show that non-normalized cardiac tensor maps are associated with mean fractional anisotropy of 0.25±0.07 and mean diffusivity of 8.9±1.6x10-4 mm2/s. Moreover, average mid-ventricular helical angle distributions ranged between –41±3º and +52±5º and were highly correlated with transmural depth, in agreement with prior published results in humans and canines. Calculated variabilities of local myocyte orientations were 2.0° and 1.4°. Laminar sheet orientation variability was found to be less stable at 2.6°. Despite such variations, the murine heart seems to be highly structured, particularly when compared to canines and humans.
Conclusions: This tensor map has the potential to yield an accurate mean representation and identification of common or unique features of the cardiac myocyte architecture, to establish a baseline standard reference of DTI indices, and to improve detection of biomarkers, especially in pathological states or post-transgenetic modifications.
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Support was received (PI: C Constantinides) from grant IPE/TEXNOLOGIA/MHXAN/0609(BE)/05 from the Research Promotion Foundation. All imaging was performed at the Duke Center for In Vivo Microscopy, an NIH/NIBIB National Biomedical Technology Resource Center (P41 EB015897).