title: From homogeneous to fractal normal and tumorous microvascular networks in the brain.
abstract: We studied normal and tumorous three-dimensional (3D) microvascular networks in primate and rat brain. Tissues were prepared following a new preparation technique intended for high-resolution synchrotron tomography of microvascular networks. The resulting 3D images with a spatial resolution of less than the minimum capillary diameter permit a complete description of the entire vascular network for volumes as large as tens of cubic millimeters. The structural properties of the vascular networks were investigated by several multiscale methods such as fractal and power-spectrum analysis. These investigations gave a new coherent picture of normal and pathological complex vascular structures. They showed that normal cortical vascular networks have scale-invariant fractal properties on a small scale from 1.4 mum up to 40 to 65 mum. Above this threshold, vascular networks can be considered as homogeneous. Tumor vascular networks show similar characteristics, but the validity range of the fractal regime extend to much larger spatial dimensions. These 3D results shed new light on previous two dimensional analyses giving for the first time a direct measurement of vascular modules associated with vessel-tissue surface exchange.
authors.affiliation: IMFT UMR5502 CNRS-INPT/UPS, Toulouse, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Risser
authors.forename: Franck
authors.initials: F
authors.lastname: Plouraboué
authors.forename: Alexandre
authors.initials: A
authors.lastname: Steyer
authors.forename: Peter
authors.initials: P
authors.lastname: Cloetens
authors.forename: Géraldine
authors.initials: G
authors.lastname: Le Duc
authors.forename: Caroline
authors.initials: C
authors.lastname: Fonta
mesh_terms: D000818:Animals; D001932:Brain Neoplasms / Q000098:blood supply* / Q000473:pathology; D002144:Callithrix; D045744:Cell Line, Tumor; D003287:Contrast Media; D003627:Data Interpretation, Statistical; D017709:Fractals; D007091:Image Processing, Computer-Assisted; D008297:Male; D008833:Microcirculation; D009336:Necrosis; D009368:Neoplasm Transplantation; D051381:Rats; D011916:Rats, Inbred F344; D016019:Survival Analysis
chemical_list: D003287:Contrast Media