Abstract: Objective To propose a new method for acquiring pulmonary function parameters based on measurement of volume
changes of thoracic impedance. Methods We studied the relationship between the volume changes of thoracic impedance and
pulmonary function parameters during forced breathing based on bioimpedance measurement, and developed an instrument
for measuring thoracic impedance. Using this instrument and a MRI spirolab III lung function test instrument, both based on
flowmeter measurement, we measured such pulmonary function parameters including forced vital capacity (FVC), forced
expiratory volume in one second/FVC (FEV1/FVC), and peak expiratory flow in 10 healthy volunteers and compared the
measurement results. Results The differences in the parameters measured using the two instruments were all within two folds
of the positive and negative standard deviations of the average values, demonstrating good consistency in the measurement
between the two methods. Conclusions The measurement results of the bioimpedance-based instrument we developed show
good consistency with those by the commercially available pulmonary function test instrument.