Detection of local lung air content by electrical impedance tomography compared with electron beam CT

Abstract

The aim of the study was to validate the ability of electrical impedance tomography (EIT) to detect local changes in air content, resulting from modified ventilator settings, by comparing EIT findings with electron beam computed tomography (EBCT) scans obtained under identical steady-state conditions. The experiments were carried out on six anesthetized supine pigs ventilated with five tidal volumes (VT) at three positive end-expiratory pressure (PEEP) levels. The lung air content changes were determined both by EIT (Goe-MF1 system) and EBCT (Imatron C-150XP scanner) in six regions of interest, located in the ventral, middle, and dorsal areas of each lung, with respect to the reference air content at the lowest VT and PEEP, as a change in either local electrical impedance or lung tissue density. An increase in local air content with VT and PEEP was identified by both methods at all regions studied. A good correlation between the changes in lung air content determined by EIT and EBCT was revealed. Mean correlation coefficients in the ventral, middle, and dorsal regions were 0.81, 0.87, and 0.93, respectively. The study confirms that EIT is a suitable, noninvasive method for detecting regional changes in air content and monitoring local effects of artificial ventilation.

Assessment of regional ventilation distribution: comparison of vibration response imaging (VRI) with electrical impedance tomography (EIT)

“…Excellent agreement between VRI and EIT was found for pooled V T measurements (R 2 0.96). In the assessment of regional lung ventilation, correlations between the measurements made by VRI and EIT are comparable to studies comparing EIT and CT [4,5].…”

“…It is able to measure the regional distribution of tidal volume (V T ) based on thoracic bioimpedance changes [3]. There is a high linear correlation between EIT and CT in detecting regional ventilation distribution (R 2 from 0.81 to 0.93) [4,5]. Furthermore, EIT has been validated against several established methods, such as spirometry (R 2 0.98), radionuclide scanning (R 2 0.98), and single photon emission CT (R 2 0.92) [6,7,8].…”

Tomografia impedancyjna w diagnostyce i monitorowaniu zaburzeń funkcji płuc na oddziale intensywnej terapii — opis przypadku i przegląd piśmiennictwa

“…As EIT is non-invasive and virtually causes no adverse side effects (lack of radiation, no transport required), the method has become an attractive alternative to computed tomography, magnetic resonance imaging or ultrasound examinations. Many comparative medical trials have proved that the EIT results are reliable and repeatable [21][22][23][24][25][26][27][28][29].…”

Optimal three-dimensional reconstruction for lung cancer tissues

“…X-ray computed tomography (XCT) is a widely-used imaging technique in medical applications [1][2][3]. In the existing methods of three-dimensional (3D) x-ray reconstruction of lung cancer tissue, the investigated objects are reconstructed from a series of two-dimensional (2D) image sections using a 3D reconstruction algorithm.…”