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Micro-CT images of the renal arteries of intact rat kidneys, which had theirvasculature injected with the contrast agent polymer Microfil, werecharacterized. Measurement of inter-branch segment properties and thehierarchical structure of the vessel trees were computed by an automatedalgorithmic approach. The perfusion territories of the different kidneys, aswell as the local diameters of the segmented vasculature were mapped onto therepresentative structures and visually explored. Various parameters werecompared in order to outline key geometrical properties, properties which wereshown to not have a wide range of inter-specimen variation. It is shown thatthe fractal scaling in non-symmetric branching reveals itself differently, thanin symmetric branching (e.g., in the lung the mean bronchial diameters at eachgeneration are closely related). Also, perfused tissue is shown to have verylittle inter-specimen variation and therefore could be used in future studiesrelated to characterizing various disease states of tissues and organs based onvascular branching geometry.

Quantifying and Visualizing Vascular Branching Geometry with Micro-CT: Normalization of Intra- and Inter-Specimen Variations