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Special Section on Pioneers in Biomedical Optics: A.J. Welch

Preparation and characterization of polyurethane optical phantoms

[+] Author Affiliations
Theodore Moffitt

Oregon Medical Laser Center, 9205 SW Barnes Road, Portland, Oregon 97225

Yin-Chu Chen

Massachusetts General Hospital, Wellman Center for Photomedicine Dermatology, 50 Blossom Street, Their 224, Boston, Massachusetts 02114

Scott A. Prahl

Oregon Medical Laser Center, 9205 SW Barnes Road, Portland, Oregon 97225

J. Biomed. Opt. 11(4), 041103 (September 13, 2005November 23, 2005November 29, 2005August 16, 2006August 16, 2006). doi:10.1117/1.2240972
History: Received September 13, 2005; Revised November 23, 2005; Accepted November 29, 2005; Published August 16, 2006; Online August 16, 2006
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We describe a method for the preparation of a polyurethane phantom to simulate the optical properties of biologic tissues at two wavelengths in the visible and near-infrared spectral range. We characterize the addition of added molecular absorbers with relatively narrow absorption bands [full width at half maximum (FWHM) 32 and 76nm for Epolight 6084 and 4148, respectively] for independent absorption at 690nm for absorption up to 5cm1, and 830nm for absorptions up to 3cm1. Absorption by both dyes is linear with concentration in these respective regions and is consistent in polyurethane both before and after curing. The dyes are stable over long durations with no more than 4% change. The absorption of visible light by polyurethane decreases with time and is stable by one year with a drop of 0.03±0.003cm1 from 500 to 830nm. The scattering properties are selected by the addition of TiO2 particles to the polyurethane, which we functionally describe for the 690- and 830-nm wavelengths as related to the weight per volume. We demonstrate that the variation in absorption and scattering properties for large batch fabrication (12 samples) is ±3%. The optical properties of the phantoms have not significantly changed in a period of exceeding one year, which makes them suitable for use as a reference standard.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Theodore Moffitt ; Yin-Chu Chen and Scott A. Prahl
"Preparation and characterization of polyurethane optical phantoms", J. Biomed. Opt. 11(4), 041103 (September 13, 2005November 23, 2005November 29, 2005August 16, 2006August 16, 2006). ; http://dx.doi.org/10.1117/1.2240972


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