The usually described sonographic findings suggestive of sarcoma are mixed echogenic and poor echogenic parts, central necrosis, and findings of irregular vessel distribution, low impedance to flow and high peak systolic velocity as detected by colour Doppler.
However, droop control has numerous limitations and challenges, such as voltage drop during load change and frequency variation resulting from the droop principles and is sensitive to distribution line impedance [9, 10].
Mercury intrusion porosimetry is employed to quantify porosity and pore size distribution, and impedance spectroscopy as a non-destructive technique able to give information on structural changes.
Based on the pore size distribution and impedance results, it is proposed that the F-MWCNTs with larger diameters can effectively avoid the surface and networks of F-MWCNTs being blocked by the enlarged LiF crystals, and hence display the better electrochemical performances.
It generates cross-sectional images of the distribution of impedance changes within the chest for monitoring the distribution of regional ventilation [ 7– 9].
In order to improve the sensitivity and electric field distribution of impedance measurement, four different electrode shapes have been proposed in this study.
Lung mechanics, regional ventilation distribution (electrical impedance tomography), cerebral tissue oxygenation index (near infrared spectroscopy), arterial pressures and blood gas values were recorded regularly.
Therefore, the relation and distribution of impedance changes within and between defined regions of interest for any given time point, as utilised in the present experimental design, may provide a more robust estimate of ventilation and circulation in different parts of the lung.
On the basis that a gas/liquid two-phase flow was considered as a strongly inhomogeneous medium due to the high contrast in acoustic impedance distribution, the authors analysed the inherent dependency of the incomplete tomographic projections on the distribution of bubbles in liquid when using transmission-mode (TM) ultrasound computerized tomography (UCT).
The distribution of line impedance of each type is not the same.
