Study of Freezing and Defrosting Effects on Complex Permittivity of Biological Tissues

In this letter we study the effect of freezing and defrosting on dielectric properties biological tissues. The electromagnetic characterization tissues at microwave frequencies is crucial for development microwave-based biomedical devices. These measurements are often not practical, as tissue degradation restricts time available between excision measurements. For reason, measurement that underwent may provide researchers with more flexibility in setting campaigns, thus speeding up To end, presents frozen defrosted tissue, which translates into following objectives: first, investigate if depend storage time; second, determine differ from those fresh As a result, measure ten samples chicken muscle, bovine liver, fat, each before after (up to 14 days) defrosting. performed open-ended coaxial probe method frequency band 0.5–8.5 GHz. We observe slight increase—less than 10%—in complex permittivity high-water-content (muscle liver) defrosting, negligible fat