Application of the P/sub 3/ approximation to frequency domain measurements

Summary form only given. The frequency domain technique is a simple approach for performing time-resolved measurements in turbid media. From these measurements, accurate values of the absorption and scattering coefficients of the medium can be determined. This approach can be used for noninvasive optical medical diagnostics and other applications. In the infinite medium geometry, precision of better than 1% can be obtained in the diffusion limit. We examine the performance of the frequency domain technique when the diffusion equation is no longer valid, as for human tissue with high blood content or outside the wavelength range of approximately 650 to 900 nm.