Figure 1.
Schematic of the VEPS Head/coil configuration and a block diagram of the experimental prototype.
The system consists of five modules: digital synthesizer, transceiver, phase detector, data acquisition and data processing.
Figure 2.
Photographs of the VEPS clinical Head/coil device and an illustration of a patient in a critical care unit wearing the device.
Figure 3.
Flow diagram of the clinical study.
Figure 4.
Computer tomography (CT) of the brain of the patients involved in the study, prior to the VEPS measurements.
The CT’s are divide into two groups according to clinical neurology pathology valuation: Edema and Hematoma. Moderate to severe diffuse brain edema without hemorrhage or hematomas, and subdural or epidural well located haematomas regions are evident. A description of the particular pathology is given next to each CT image.
Table 1.
Table 1. Listing of data for the healthy volunteers and brain damage patients enrolled in the study.
Table 2.
Table 2. Statistical analysis with a Mann-Whitney U test of the VEPS/CP (degrees/cm) data for the experimental groups and subgroups in ranges of frequencies in which a statistically significant difference of P<0.05 between them, was found.
Figure 5.
The β value for all the subjects of this study as a function of the subject age.
Healthy volunteers, patients with brain condition of edema and of hematoma are marked with different symbols.
Figure 6.
The γ value for all the subjects of this study as a function of age.
Healthy volunteers, patients with brain condition of edema and of hematoma are marked with different symbols.
Figure 7.
A scalar classifier plot of each experimental subject in terms of two values for that subject, β and γ.
Each data point represents a subject. Healthy volunteers, patients with brain condition of edema and of hematoma are marked with different symbols.
Table 3.
Electrical conductivity (S/m) at specific frequencies for brain tissue, human serum and blood.