Using LabVIEW to facilitate calibration and verification for respiratory impedance plethysmography.
A system for calibrating the Respitrace impedance plethysmograph was developed with the capacity to quantitatively verify the accuracy of calibration. LabVIEW software was used on a Macintosh II computer to create a user-friendly environment, with the added benefit of reducing development time. The system developed enabled a research assistant to calibrate the Respitrace within 15 min while achieving an accuracy within the normally accepted 10% deviation when the Respitrace output is compared to a water spirometer standard. The system and methods described were successfully used in a study of 10 subjects smoking cigarettes containing marijuana or cocaine under four conditions, calibrating all subjects to 10% accuracy within 15 min.
Ellis
W S
WS
Langley Porter Psychiatric Institute, University of California, San Francisco 94143.
Jones
R T
RT
D000703:Analog-Digital Conversion; D002138:Calibration; D003626:Data Display; D006801:Humans; D010992:Plethysmography, Impedance; D011187:Posture; D012119:Respiration / Q000502:physiology*; D015656:Respiratory Mechanics / Q000502:physiology; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013147:Spirometry; D014159:Transducers