Estimation of Blood Flow Rates in Large Microvascular Networks

Brendan C. Fry, Jack Lee, Nicolas P. Smith, Timothy W. Secomb

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Objective: Recent methods for imaging microvascular structures provide geometrical data on networks containing thousands of segments. Prediction of functional properties, such as solute transport, requires information on blood flow rates also, but experimental measurement of many individual flows is difficult. Here, a method is presented for estimating flow rates in a microvascular network based on incomplete information on the flows in the boundary segments that feed and drain the network. Methods: With incomplete boundary data, the equations governing blood flow form an underdetermined linear system. An algorithm was developed that uses independent information about the distribution of wall shear stresses and pressures in microvessels to resolve this indeterminacy, by minimizing the deviation of pressures and wall shear stresses from target values. Results: The algorithm was tested using previously obtained experimental flow data from four microvascular networks in the rat mesentery. With two or three prescribed boundary conditions, predicted flows showed relatively small errors in most segments and fewer than 10% incorrect flow directions on average. Conclusions: The proposed method can be used to estimate flow rates in microvascular networks, based on incomplete boundary data, and provides a basis for deducing functional properties of microvessel networks.

Original languageEnglish (US)
Pages (from-to)530-538
Number of pages9
JournalMicrocirculation
Volume19
Issue number6
DOIs
StatePublished - Aug 2012

Keywords

  • Flow simulation
  • Hemodynamics
  • Imaging
  • Microvascular function

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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