scholarly journals Transit Time Flowmeter-Thermocouple Response Comparitor

1969 ◽  
Author(s):  
R. L. Randall ◽  
R. B. Cassidy
Keyword(s):  
Transit Time ◽  
Transit Time Flowmeter

scholarly journals Prediction of the Cerebral Hyperperfusion Phenomenon after Carotid Endarterectomy Using a Transit Time Flowmeter

2020 ◽  
Vol 60 (2) ◽  
pp. 94-100 ◽  
Author(s):  
Hideaki MATSUMURA ◽  
Yoshiro ITO ◽  
Kazuya UEMURA ◽  
Yasunobu NAKAI ◽  
Yoji KOMATSU ◽  
...  
Keyword(s):  
Carotid Endarterectomy ◽  
Transit Time ◽  
Cerebral Hyperperfusion ◽  
Transit Time Flowmeter

Pulsed Ultrasonic Transit Time Flowmeter

1962 ◽  
Vol 9 (1) ◽  
pp. 44-49 ◽  
Author(s):  
D. L. Franklin ◽  
D. W. Baker ◽  
R. F. Rushmer
Keyword(s):  
Transit Time ◽  
Pulsed Ultrasonic ◽  
Transit Time Flowmeter

Validation of miniature ultrasonic transit-time flow probes for measurement of renal blood flow in rats

1995 ◽  
Vol 268 (1) ◽  
pp. F175-F178 ◽  
Author(s):  
W. J. Welch ◽  
X. Deng ◽  
H. Snellen ◽  
C. S. Wilcox
Keyword(s):  
Blood Flow ◽  
Renal Blood Flow ◽  
Transit Time ◽  
Ex Vivo ◽  
High Flow ◽  
Flow Rates ◽  
Time Flow ◽  
Wide Range ◽  
Transit Time Flowmeter

This study validates the accuracy of miniature ultrasonic transit-time flow probes for measuring renal blood flow (RBF) in the rat. Probes for 1-mm and 2-mm vessels were calibrated ex vivo using excised arteries at varying flow rates and hematocrit (Hct). Correlation between measured and true flow rates for the 2-mm probe were identical (r = 1.0) at both normal and subnormal Hct values. Correlation for the 1-mm probe was high (r = 0.994) at normal Hct, but varied at both high flow rates and subnormal Hct values. In vivo correlation of RBF measurements using the 1-mm probe with the clearance and extraction of p-aminohippuric acid showed a high correlation (r = 0.84; n = 72, P < 0.0001) over a wide range of flow rates (0.5-21 ml/min) and Hct (36-74%). Zero flow levels remained steady, averaging -0.2 +/- 0.2 ml/min during occlusion in the living animal and -0.1 +/- 0.3 ml/min after exsanguination. This study shows that the ultrasonic transit-time flowmeter (1-mm and 2-mm probes) is a reasonably accurate and reliable method with which to measure RBF in the anesthetized, acute-instrumented rat.

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