Dielectric properties of human red blood cells in suspension at radio frequencies.
Dielectric properties of human red blood cells (RBCs) in suspension (hematocrit 50%) from 243 healthy persons (120 males, 123 females) were measured at 25 degrees C in a frequency range of 1-500 MHz, with a coaxial transmission line reflection method (one-side measurement). The measuring system, controlled by an IBM-PC computer, was composed of a network analyzer (HP4195A), an impedance test adapter (HP41951-61001), a coaxial line sensor, and a temperature-controlling set. The data measured revealed a statistically significant age dependence, with a critical age of about 49 years, above which permittivity and conductivity of human RBCs in suspension decreased significantly.
Lu
Y
Y
Department of Biomedical Engineering, Peking Union Medical College, Beijing, People's Republic of China.
Yu
J
J
Ren
Y
Y
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology; D003199:Computer Systems; D004553:Electric Conductivity; D017097:Electric Impedance; D004912:Erythrocytes / Q000502:physiology* / Q000528:radiation effects; D005260:Female; D006400:Hematocrit; D006801:Humans; D008297:Male; D008838:Microcomputers; D008875:Middle Aged; D011846:Radio Waves