Comparison of different methods to define regions of interest for evaluation of regional lung ventilation by EIT

Physiological Measurement
Sven PulletzInéz Frerichs

Abstract

The measurement of regional lung ventilation by electrical impedance tomography (EIT) has been evaluated in many experimental studies. However, EIT is not routinely used in a clinical setting, which is attributable to the fact that a convenient concept for how to quantify the EIT data is missing. The definition of region of interest (ROI) is an essential point in the data analysis. To date, there are only limited data available on the different approaches to ROI definition to evaluate regional lung ventilation by EIT. For this survey we examined ten patients (mean age +/- SD: 60 +/- 10 years) under controlled ventilation. Regional tidal volumes were quantified as pixel values of inspiratory-to-expiratory impedance differences and four types of ROIs were subsequently applied. The definition of ROI contours was based on the calculation of the pixel values of (1) standard deviation from each pixel set of impedance data and (2) the regression coefficient from linear regression equations between the individual local (pixel) and average (whole scan) impedance signals. Additionally, arbitrary ROIs (four quadrants and four anteroposterior segments of equal height) were used. Our results indicate that both approaches to ROI definition u...Continue Reading

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Citations

Jul 8, 2009·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Yan ZhangRichard H Bayford
Jan 26, 2011·Respirology : Official Journal of the Asian Pacific Society of Respirology·Florian ReifferscheidInéz Frerichs
Apr 16, 2011·American Journal of Respiratory and Critical Care Medicine·Martijn MiedemaAnton H van Kaam
Mar 7, 2009·Critical Care : the Official Journal of the Critical Care Forum·Anneli FagerbergAnders Aneman
Feb 2, 2010·Critical Care : the Official Journal of the Critical Care Forum·Zhanqi ZhaoKnut Möller
Jan 27, 2011·Critical Care : the Official Journal of the Critical Care Forum·Caroline A GrantAndreas Schibler
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Jul 26, 2012·IEEE Transactions on Bio-medical Engineering·Damien FerrarioMarc Bodenstein
Jan 18, 2012·IEEE Transactions on Medical Imaging·Camille Gómez-LabergeGerhard K Wolf
Jul 22, 2014·Journal of Paediatrics and Child Health·Karly MontgomeryJudith Hough
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Apr 18, 2014·Current Opinion in Critical Care·Inéz FrerichsNorbert Weiler
Apr 8, 2014·Pediatric Critical Care Medicine : a Journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies·Judith L HoughAndreas Schibler
Jan 15, 2013·Pediatric Critical Care Medicine : a Journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies·Judith L HoughAndreas Schibler

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