Dispersion of transit times within the pulmonary vasculature from microfocal angiograms

Anne V. Clough*, Qiong Wang, Steven T. Haworth, John H. Linehan, David T. Roerig, Christopher C. Hanger, Christopher A. Dawson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The site and mechanism of the dispersion of blood transit times within the pulmonary vascular bed can be described using x-ray angiography images of bolus passage through the pulmonary vasculature. Time-absorbance curves from the lobar inlet artery and outlet vein, various locations within the arterial and venous trees, and regions of the microvasculature were acquired from the images. The overall dispersion within the lung lobe was determined from the inlet arterial and outlet venous curves by examining the difference in their first and second moments, mean transit time and variance, respectively. Subsequently, the moments at each location within the arterial tree were calculated and compared to those of the lobar inlet artery curve. The transit time variance imparted on the bolus as it traveled through the pulmonary arterial tree upstream from the smallest measured arteries was < 5 percent of the variance attributable to transit through the total lung lobe vascular bed. Similar results were obtained for the venous pathways using reverse-flow conditions. Regional capillary mean transit time and variance were obtained from the measured microvascular residue curves using a mass-balance model. These results suggest that most of the bolus dispersion occurs within the pulmonary capillary bed rather than in large feeding arteries or draining veins.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages199-208
Number of pages10
Volume3033
ISBN (Print)0819424447
StatePublished - Dec 1 1997
EventMedical Imaging 1997: Physiology and Function from Multidimensional Images - Newport Beach, CA, USA
Duration: Feb 23 1997Feb 25 1997

Other

OtherMedical Imaging 1997: Physiology and Function from Multidimensional Images
CityNewport Beach, CA, USA
Period2/23/972/25/97

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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