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PubMed · 5152316

[Simple method of standardizing the respiratory flow-meter].

J E Lafosse·H Vieillefond·G Saumon·G Atland
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J E Lafosse, H Vieillefond, G Saumon, G Atland. 1971. [Simple method of standardizing the respiratory flow-meter].. https://pubmed.ncbi.nlm.nih.gov/5152316/

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Characterizing and correcting for the dynamic response of a bag-in-box system.

A bag-in-box system (BBS) whose volume is monitored by a mechanical spirometer tends to have a slow response if the volume of the box is large, and this may significantly affect its measurement of gas flow. We describe a device for creating reproducible gas flows with which the impulse response of a BBS may be conveniently determined. Two computational techniques for correcting a BBS flow measurement for the effects of the impulse response were investigated: 1) an exponential model method that assumes a second-order model of the BBS dynamics and 2) a Fourier transform-based method of deconvolution known as Wiener filtering. Both correction methods produced a significant increase in the accuracy of BBS flow estimations, with the Wiener filter giving superior results.

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