Study of the Optical Properties of Biological Tissues Quantitative Assessment Possibility using Spatial-Frequency Domain Imaging Topics: Biomedical Signals Analysis; Clinical Studies; Diagnostics in Healthcare; Noninvasive methods and devises for biomedical signals acquisition In Proceedings of the 15th International Joint Conference on Biomedical Engineering Systems and Technologies - Volume 1 BIODEVICES: RMHM, 317-321, 2022 , Vienna, Austria