Biplane videoroentgenographic analysis of dynamic regional lung strains in dogs

P. A. Chevalier, J. F. Greenleaf, R. A. Robb, E. H. Wood

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A method is described for determining the spatial distribution of pulmonary parenchymal strains in the intact canine thorax, using measurements of displacement of metallic (1 mm diam) markers percutaneously implanted throughout the parenchyma of the right lung. Dogs are supported head up or head down in a water immersion respirator with the animal's airway connected to ambient air. Tracking of the parenchymal markers is accomplished by stereo biplane videoroentgenographic recordings, which allow high temporal (60/s) and spatial (±1.5mm) resolution measurements of the 'tagged' lungs during various respiratory maneuvers. After transferring the video information to a stop action video disc, an operator interactive computer program is used to input the geometric coordinates of the markers into the computer. The true spatial coordinates are then determined after correction for pincushion and magnification distortions. Spatial and temporal distributions of regional parenchymal strains are obtained by determining the distance between markers on a frame by frame basis over the extent of the respiratory cycle. Data indicate nonuniformity in regional lung parenchymal strains.

Original languageEnglish (US)
Pages (from-to)118-122
Number of pages5
JournalJournal of applied physiology
Volume40
Issue number1
DOIs
StatePublished - Jan 1 1976

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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