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Measurement of Anterior and Posterior Circulation Flow Contributions to Cerebral Blood Flow
Author(s) -
Boyajian Robert A.,
Schwend Raymond B.,
Wolfe Mary M.,
Bickerton Robert E.,
Otis Shirley M.
Publication year - 1995
Publication title -
journal of neuroimaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.822
H-Index - 64
eISSN - 1552-6569
pISSN - 1051-2284
DOI - 10.1111/jon1995511
Subject(s) - medicine , cerebral circulation , blood flow , cerebral blood flow , cerebral arteries , hemodynamics , anatomy , cardiology
Ultrasound‐derived volumetric flow analysis may be useful in answering questions of basic physiological interest in the cerebrovascular circulation. Using this technique, the authors have sought to describe quantitatively the complete concurrent flow relations among all four arteries supplying the brain. The aim of this study of normal subjects was to determine the relative flow contributions of the antenor (internal carotid arteries) and posterior (vertebral arteries) cerebral circulation. Comparisons between the observed and theoretically expected anterior and posterior flow distribution would provide an opportunity to assess traditional rheological conceptions in vivo. Pulsed color Doppler ultrasonography was used to measure mean flow rates in the internal carotid and vertebral arteries in 21 normal adults. The anterior circulation (Internal carotid arteries bilaterally) carried 82% of the brain's blood supply and compnsed 67% of the total vascular cross‐sectional area. These values demonstrate precise concordance between observations in vivo and the theoretically derived (Hagen‐Poiseuille) expected flow distribution. These cerebrovascular findings support the traditional conception of macroscopic blood flow. Further studies using ultrasound‐derived volumetric analysis of the brain's arterial flow relations may illuminate the vascular pathophysiology underlying aging, cerebral ischemia, and dementias.