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Journal of Biomedical Optics • Open Access

Characterization of thin poly(dimethylsiloxane)-based tissue-simulating phantoms with tunable reduced scattering and absorption coefficients at visible and near-infrared wavelengths
Author(s): Gage J. Greening; Raeef Istfan; Laura M. Higgins; Kartik Balachandran; Darren M. Roblyer; Mark C. Pierce; Timothy J. Muldoon

Paper Abstract

Optical phantoms are used in the development of various imaging systems. For certain applications, the development of thin phantoms that simulate the physical size and optical properties of tissue is important. Here, we demonstrate a method for producing thin phantom layers with tunable optical properties using poly(dimethylsiloxane) (PDMS) as a substrate material. The thickness of each layer (between 115 and 880  μm) was controlled using a spin coater. The reduced scattering and absorption coefficients were controlled using titanium dioxide and alcohol–soluble nigrosin, respectively. These optical coefficients were quantified at six discrete wavelengths (591, 631, 659, 691, 731, and 851 nm) at varying concentrations of titanium dioxide and nigrosin using spatial frequency domain imaging. From the presented data, we provide lookup tables to determine the appropriate concentrations of scattering and absorbing agents to be used in the design of PDMS-based phantoms with specific optical coefficients. In addition, heterogeneous phantoms mimicking the layered features of certain tissue types may be fabricated from multiple stacked layers, each with custom optical properties. These thin, tunable PDMS optical phantoms can simulate many tissue types and have broad imaging calibration applications in endoscopy, diffuse optical spectroscopic imaging, and optical coherence tomography, etc.

Paper Details

Date Published: 11 November 2014
PDF: 14 pages
J. Biomed. Opt. 19(11) 115002 doi: 10.1117/1.JBO.19.11.115002
Published in: Journal of Biomedical Optics Volume 19, Issue 11
Show Author Affiliations
Gage J. Greening, Univ. of Arkansas (United States)
Raeef Istfan, Boston Univ. (United States)
Laura M. Higgins, Rutgers, The State Univ. of New Jersey (United States)
Kartik Balachandran, Univ. of Arkansas (United States)
Darren M. Roblyer, Boston Univ. (United States)
Mark C. Pierce, Rutgers, The State Univ. of New Jersey (United States)
Timothy J. Muldoon, Univ. of Arkansas (United States)

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