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Am J Physiol Heart Circ Physiol 284: H1721-H1728, 2003. First published January 9, 2003; doi:10.1152/ajpheart.00741.2002
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Vol. 284, Issue 5, H1721-H1728, May 2003

A new method for assessing arteriolar diameter and hemodynamic resistance using image analysis of vessel lumen

Karel Tyml1,2, Donald Anderson2, Darcy Lidington1,2, and Hanif M. Ladak2,3,4

1 A. C. Burton Laboratory, Lawson Health Research Institute, 3 Imaging Research Labs, Robarts Research Institute, 2 Department of Medical Biophysics, and 4 Department of Electrical and Computer Engineering, University of Western Ontario, London, Ontario, Canada NCA 5C1

To characterize the nonuniform diameter response in a blood vessel after a given stimulus (e.g., arteriolar conducted response), frequent serial diameter measurements along the vessel length are required. We used an advanced image analysis algorithm (the "discrete dynamic contour") to develop a quick, reliable method for serial luminal diameter measurements along the arteriole visualized by intravital video microscopy. With the use of digitized images of the arteriole and computer graphics, the method required an operator to mark the image of the two inner edges of the arteriole at several places along the arteriolar length. The algorithm then "filled in" these marks to generate two continuous contours that "hugged" these edges. A computer routine used these contours to determine luminal diameters every 20 µm. Based on these diameters and on Poiseuille's law, the routine also estimated the hemodynamic resistance of the blood vessel. To demonstrate the usefulness of the method, we examined the character of spatial decay of KCl-induced conducted constriction along ~500-µm-long arteriolar segments and the KCl-induced increase in hemodynamic resistance computed for these segments. The decay was only modestly fitted by a simple exponential, and the computed increase in resistance (i.e., 5- to 70-fold) was only modestly predicted by resistance increase based on our mathematical model involving measurements at two arteriolar sites (Tyml K, Wang X, Lidington D, and Oullette Y. Am J Physiol Heart Circ Physiol 281: H1397-H1406, 2001). We conclude that our method provides quick, reliable serial diameter measurements. Because the change in hemodynamic resistance could serve as a sensitive index of conducted response, use of this index in studies of conducted response may lead to new mechanistic insights on the response.

semiautomatic analysis; conducted response; resistance to blood flow





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