Evaluation of Electrical Impedance Tomography for monitoring of Obstructive Sleep Apnea using Two Electrode Planes: a Comparison study.

Fully simultaneous polysomnography (PSG) and electrical impedance tomography (EIT) incorporated with partially synchronized computed tomography (CT) scan were used to investigate the performance of EIT on the monitoring of obstructive sleep apnea (OSA) occurring on the upper airway. The opening and closing of the upper airway will lead to different conductivity distribution which can be visualized through the EIT images. In this study, two rings of 16 electrodes were attached on the upper and lower transverse planes of airway, and the behavior of airway is extracted through the independent component analysis (ICA) algorithm with the reference of airway flow obtained through PSG due to the efficient synchronization. Refereed to the anatomical structures from CT scans, the performance of the EIT in monitoring the sleep disorder will be validated and presented through the reconstructed EIT images on both upper-layer and lower-layer. [ABSTRACT FROM AUTHOR]