Measurements of Ligament and Cartilage Optical Properties at 351 nm, 365 nm, and in the Visible Range(440 to 800 nm)

M. Descalle, S. L. Jacques, S. A. Prahl, T. L. Laing, W. R. Martin, SPIE Proceedings of Laser-Tissue Interaction, Tissue Optics, and Laser Welding III, 3195, 280-286 (1998).

To further evaluate the potential for intra-articular phototherapy, the optical properties of normal porcine ligament and cartilage were determined in vitro. The diffuser reflectance, R_d, was measured with an integrating sphere at 351, 365 nm and in the range 440-800 nm. The lateral spread of light introduced by a 400 mm optical fiber was measured and analyzed to yield the optical penetration depth δ. The two measurements, R_d and δ yielded the absorption coefficient μ_a and the reduced scattering μ_s′=μ_s(1−g) at 351, 365 nm and in the range 440-800 nm.

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