Measurement of lung volume in mechanically ventilated monkeys with an ultrasonic flow meter and the nitrogen washout method

2004 ◽  
Vol 30 (1) ◽  
pp. 127-132 ◽  
Author(s):  
Andreas Schibler ◽  
Jürg Hammer ◽  
Ruedi Isler ◽  
Christian Buess ◽  
Christopher J. L. Newth
Keyword(s):  
Lung Volume ◽  
Flow Meter ◽  
Mechanically Ventilated ◽  
Nitrogen Washout ◽  
Ultrasonic Flow Meter

scholarly journals Measurement of lung volume and ventilation distribution with an ultrasonic flow meter in healthy infants

2002 ◽  
Vol 20 (4) ◽  
pp. 912-918 ◽  
Author(s):  
A. Schibler ◽  
G.L. Hall ◽  
F. Businger ◽  
B. Reinmann ◽  
J.H. Wildhaber ◽  
...  
Keyword(s):  
Lung Volume ◽  
Ventilation Distribution ◽  
Flow Meter ◽  
Healthy Infants ◽  
Ultrasonic Flow Meter

scholarly journals Performance optimization of ultrasonic flow meter based on computational fluid dynamics

2018 ◽  
Vol 10 (8) ◽  
pp. 168781401879326 ◽  
Author(s):  
Shanbi Peng ◽  
Wen Liao ◽  
Huan Tan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Performance Optimization ◽  
Evaluation Method ◽  
Flow Meter ◽  
Rectification Effect ◽  
Ultrasonic Flow Meter ◽  
Accuracy Of Measurement ◽  
Nature Gas ◽  
Measuring Tool

As a common nature gas measuring tool, ultrasonic flow meter is more and more put into use. Therefore, the accuracy of measurement is what we concern the most. The performance of ultrasonic flow meter is closely related to fluid state which flows through it. This article identified the evaluation method of rectification effect of gasotron and its implementation steps. It proposed an assessing index Lmin based on dichotomy. Computational fluid dynamics method is used to simulate the model of an upstream straight pipe section with a header and plate gasotron, which obtained the assessing index Lmin in five different transmission conditions. Finally, the feasibility of the gasotron is validated against comparing indication errors in different installation conditions: with a header, benchmark, with a header and gasotron.

Measurement of high lung volumes by nitrogen washout method

1994 ◽  
Vol 77 (3) ◽  
pp. 1562-1564 ◽  
Author(s):  
Y. Sivan ◽  
J. Hammer ◽  
C. J. Newth
Keyword(s):  
Lung Volume ◽  
Human Infants ◽  
Lung Volumes ◽  
Nitrogen Washout ◽  
Thoracic Gas Volume ◽  
Residual Capacity ◽  
The Difference ◽  
Gas Dilution ◽  
Spontaneously Breathing ◽  
Gas Volume

Studies on human infants suggested that thoracic gas volume (TGV) measured at end exhalation may not depict the true TGV and may differ from TGV measured from a series of higher lung volumes and corrected for the volume added. This was explained by gas trapping. If true, we should expect the discrepancy to be more pronounced when functional residual capacity (FRC) and higher lung volumes are measured by gas dilution techniques. We studied lung volumes above FRC by the nitrogen washout technique in 12 spontaneously breathing rhesus monkeys (5.0–11.3 kg wt; 42 compared measurements). Lung volumes directly measured were compared with preset lung volumes achieved by artificial inflation of the lungs above FRC with known volumes of air (100–260 ml). Measured lung volume strongly correlated with and was not significantly different from present lung volume (P = 0.05; r = 0.996). The difference between measured and preset lung volume was 0–5% in 41 of 42 cases [1 +/- 0.4% (SE)]. The direction of the difference was unpredictable; in 22 of 42 cases the measured volume was larger than the preset volume, but in 17 of 42 cases it was smaller. The difference was not affected by the volume of gas artificially inflated into the lungs. We conclude that, overall, lung volumes above FRC can be reliably measured by the nitrogen washout technique and that FRC measurements by this method reasonably reflect true FRC.

Effect of velocity profile on accuracy of transit-time ultrasonic flow meter

2016 ◽  
Vol 2016.21 (0) ◽  
pp. D134
Author(s):  
Ei MURAMATSU ◽  
Daiki HASHIGUCHI ◽  
Hideki MURAKAWA ◽  
Hitoshi ASANO ◽  
Sanehiro WADA ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Transit Time ◽  
Flow Meter ◽  
Ultrasonic Flow Meter
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