Lung Volume Measurements-Techniques, Comparison and LabVIEW Based Simulation [ ]


An integral part of complete pulmonary function testing is the measurement of lung volumes. During spirometry some lung volumes can be measured; however, measurement of the residual volume (RV), functional residual capacity (FRC), and total lung capacity (TLC) requires different techniques such as plethysmography, helium dilution and nitrogen washout. FRC is measured by one of three methods. Body plethysmography uses Boyle’s Law to determine lung volumes, whereas inert gas dilution and nitrogen washout use dilution properties of gases. Expiratory reserve volume and inspiratory vital capacity are measured after determination of FRC, which allows the calculation of the RV and TLC. The spirometry measurements assess the efficiency of the pulmonary ventilation. In this paper, lung volumes are measured using LabVIEW.