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Experimental Studies |
1 From the Department of Radiology, University of Michigan Medical Center, TC 2910K, 1500 E Medical Center Dr, Ann Arbor, MI 48109-0326. From the 1996 RSNA scientific assembly. Received July 17, 1998; revision requested August 13; revision received November 30; accepted March 26, 1999. Address reprint requests to R.O.B. (e-mail: ronbude@umich.edu).
PURPOSE: To evaluate the effect of the increase in total cross-sectional area of arteries as they branch beyond the main trunks on the resistive index (RI) and early systolic acceleration (ESA).
MATERIALS AND METHODS: An essentially noncompliant in vitro model that used a pulsatile pump, blood-mimicking fluid, and a branching tubing network that could be configured to produce a downstream cross-sectional area one, two, four, or eight times that of the feeding vessel was used to investigate the relationship, if any, between arterial bed cross-sectional area and the RI and ESA.
RESULTS: The mean ESA in the branching network was inversely proportional to cross-sectional area, decreasing by approximately a factor of two for every doubling of the cross-sectional area. The mean RI in the branching network decreased with increasing cross-sectional area, but not as greatly as the ESA did; the mean RI in the bed with eight times the upstream cross-sectional area had an RI that was approximately three-fourths the upstream RI. These relationships are real, as the slopes of the plots (ESA vs cross-sectional area, P = .001; RI vs cross-sectional area, P < .02) are significantly different from zero.
CONCLUSION: RI and ESA decrease as a result of increasing downstream cross-sectional diameter of the arterial bed.
Index terms: Blood, flow dynamics, 9*.1312, 9*.133, 9*.91, 9*.922 • Phantoms, 9*.12984, 9*.131, 9*.133, 9*.91, 9*.92 • Ultrasound (US), Doppler studies, 9*.12984
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