THE EFFECT OF FRAME RATE AND CALIBRATION ON LUNG MONITORING WITH ELECTRICAL IMPEDANCE TOMOGRAPHY

Electrical impedance tomography (EIT) is a non-invasive method that records changes in tissue impedance in the selected cross-section of the body and is mainly used to monitor patient lung ventilation. The aim of this study was to analyze the effect of the set frame rate and how calibration of the EIT system effects final record when monitoring lungs using EIT system PulmoVista 500 (Dräger Medical, Germany). Ten healthy male volunteers were measured with frame rates 10, 20, 30, 40 and 50 Hz for analysis, followed by calibrated and uncalibrated measurements. The subjects were breathing spontaneously in horizontal supine position. In the frame rate analysis, data with the references 30 and 50 Hz were compared with others using a paired T-test. The same test was used for comparing data from a calibrated and uncalibrated records. This study shows that the effect of both frame rate and calibration is negligible at the significance level of 5%.