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Measurement of the optical properties of the skull in the wavelength range 650-950 nm

1993; IOP Publishing; Volume: 38; Issue: 4 Linguagem: Inglês

10.1088/0031-9155/38/4/002

1361-6560

Michael Firbank, Mutsuhisa Hiraoka, Matthias Essenpreis, David T. Delpy,

Non-Invasive Vital Sign Monitoring

The optical properties of samples of bone from pig skull have been measured over the wavelength range 650-950 nm. The scattering phase function was measured on thin samples of the bone using a goniometer, and a value for the mean cosine g, of the scattering angle, was calculated. The scattering and absorption coefficients, mu s and mu a were then determined from measurements of diffuse reflectance and transmittance made with a pair of integrating spheres, by a step-wise search through a table of diffuse reflectance and transmittance versus mu a and mu s generated by a Monte Carlo model incorporating the measured scattering phase function. Values for g measured on six samples varied from 0.925+or-0.014 at 650 nm to 0.945+or-0.013 at 950 nm. Corresponding values for mu a and mu s measured on 18 samples were mu a=0.04+or-0.002 mm-1s, mu s=35+or-0.7 mm-1 at 650 nm to mu a=0.05+or-0.002 mm-1, mu s=24+or-0.6 mm-1 at 950 nm.