Dielectric permittivity of human blood of different lactate levels measured at millimeter waves

• Published in: Conference proceedings (IEEE Engineering in Medicine and Biology Society. Conf.) Vol. 2019; pp. 1183 - 1186
• Main Authors: Koutsoupidou, Maria, Cano-Garcia, Helena, Pricci, Roberto L., Saha, Shimul C., Rana, Srinivas, Ancu, Oana, Draicchio, Fulvia, Mackenzie, Richard, Kosmas, Panagiotis, Kallos, Efthymios
• Format: Conference Proceeding Journal Article
• Language: English
• Published: United States IEEE 01.07.2019
• Subjects: Blood; Dielectric properties; Dielectrics; Electromagnetic Phenomena; Frequency measurement; human blood measurements; Humans; lactate; Lactates - blood; millimeter waves; Permittivity; Permittivity measurement; Radiation; Temperature measurement; transmission; Wingate protocol
• ISSN: 1557-170X; 1558-4615
• DOI: 10.1109/EMBC.2019.8857488

The investigation of variations in dielectric properties of blood based on its biochemical profile is important for determining the feasibility of developing electromagnetic non-invasive sensing systems for monitoring the levels of various metabolites in blood. In this paper, the real and imaginary parts of dielectric permittivity are measured as a function of lactate concentration in the 30-60 GHz frequency range using two different measurement techniques. The blood samples are collected from a healthy subject undergoing three different exercise modes and the dielectric properties are measured with an open-ended coaxial probe technique and a custom-made millimeter wave transmission system. Good correlation is observed in measurements from the two methods, suggesting that an increase in lactate concentration lowers the imaginary part of permittivity and thus causing higher attenuation.