Figure 1.
A, The simplified sub‐epidermal moisture (SEM) biocapacitance model consisting of two parallel conducting plates that are separated by a distance d. The SEM electrodes measure the biocapacitance of soft tissues with simplified total thickness d that contain a fraction of fluid; the fluid mass is represented as a dielectric material with thickness t that is contained between the plates. B, The biocapacitance values were calculated for increasing fluid contents t within the tissue. The area of the conductive plates was taken as 7 cm2 and the examined total soft tissue thickness d was 0.7 cm. Q = the electrical charge on the plates, A = area of the conducting plates, d = the distance between the plates (total examined soft tissue thickness), t = the fluid contents within the tissue (the fluid fraction is t/d), and κ e = the dielectric constant of water