Showing papers by "Arnon D. Cohen published in 1971"
TL;DR: The photodiffusion theoretical treatment is suggested for calculations which will lead to optimal normalization techniques and transducer design for thein vivo measurements of the oxygen relative saturation in the blood.
Abstract: The diffusion equations for randomly directed photons are applied to the problem of thein vivo determination of the oxygen relative saturation in blood. A model of the living tissue is presented. The transmitted and backscattered light fluxes are calculated for various skin properties, volume occupied by the blood and the blood relative oxygen saturation. Normalization functions are introduced and analyzed for sensitivities to changes in several parameters. The photodiffusion theoretical treatment is suggested for calculations which will lead to optimal normalization techniques and transducer design for thein vivo measurements of the oxygen relative saturation in the blood.
30 citations
TL;DR: A self-balancing system that can be used as a general-purpose unit has been developed and is described, which consists of a binary counter, a digital to analog converter, and logic circuits.
Abstract: There is a need in medical and physiological instrumentation for a system that can automatically correct baseline shifts. Some cases where this need arises are discussed. A self-balancing system that can be used as a general-purpose unit has been developed and is described. It consists of a binary counter, a digital to analog converter, and logic circuits. The described system automatically balances dc shifts in signals with a range of 6 V. Balancing time is less than 15 ms. The system is designed to work with tape or chart recorders with input range of ± 1 to ± 3 V. Some design parameters of this system are discussed briefly.
11 citations