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Staged Growth of Optimized Arterial Model Trees

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Abstract

There is a marked difference in the structure of the arterial tree between epi- and endocardial layers of the human heart. To model these structural variations, we developed an extension to the computational method of constrained constructive optimization (CCO). Within the framework of CCO, a model tree is represented as a dichotomously branching network of straight cylindrical tubes, with flow conditions governed by Poiseuille's law. The tree is grown by successively adding new terminal segments from randomly selected points within the perfusion volume while optimizing the geometric location and topological site of each new connection with respect to minimum intravascular volume. The proposed method of “staged growth” guides the generation of new terminal sites by means of an additional time-dependent boundary condition, thereby inducing a sequence of domains of vascular growth within the given perfusion volume. Model trees generated in this way are very similar to reality in their visual appearance and predict diameter ratios of parent and daughter segments, the distribution of symmetry, the transmural distribution of flow, the volume of large arteries, as well as the ratio of small arterial volume in subendocardial and subepicardial layers in good agreement with experimental data. From this study we conclude that the method of CCO combined with staged growth reproduces many characteristics of the different arterial branching patterns in the subendocardium and the subepicardium, which could not be obtained by applying the principle of minimum volume alone. © 2000 Biomedical Engineering Society.

PAC00: 8719Uv, 8719Hh, 4760+i

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Authors and Affiliations

  1. Department of Medical Computer Sciences, University of Vienna, Spitalgasse 23, A-1090, Wien, Austria

    Rudolf Karch, Friederike Neumann & Wolfgang Schreiner

  2. Institute of Experimental Physics, Section for Computational Physics, University of Vienna, Strudlhofgasse 4, A-1090, Wien, Austria

    Martin Neumann

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Karch, R., Neumann, F., Neumann, M. et al. Staged Growth of Optimized Arterial Model Trees. Annals of Biomedical Engineering 28, 495–511 (2000). https://doi.org/10.1114/1.290

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