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Poster Hall B0 European Conferences on Biomedical Optics (ECBO) > Diffuse Optical Spectroscopy and Imaging > Lunch Break and Poster Session - Monday
12:45-14:15 h | Hall B0 Hall B0, ICM
Subjects: Biophotonics and Medical Engineering
We describe a diffuse optical imaging (DOI) system with structured illumination and integrated detection based on the Kubelka-Munk (KM) light propagation model for the spatial characterization of the absorption and scattering properties of turbid media. Although light propagation in turbid media may be modeled by Monte Carlo techniques or based on the radiative transfer equation (RTE), the KM model is still widely used because of its relative simplicity, as it allows to express the scattering and absorption coefficients directly in terms of the measured reflection and transmission. However, in the conventional KM method, measurements are usually performed with integrating spheres, and it is not possible to resolve the spatial characteristics of the optical properties. The proposed system is based on the concept of a single-pixel camera. Our strategy allows to retrieve images of the absorption and scattering properties of turbid media by using bucket detectors such as integrating spheres with photodiodes. The spatial resolution is achieved by projecting a set of microstructured light pattern onto the sample. Those patterns are codified by a digital micromirror device (DMD). Maps of total reflectance and transmittance, to apply the KM method, are generated from the photodiode signals by using single-pixel imaging algorithms. Our experimental results confirm the validity of the idea. The data acquisition process can be speed up by the application of compressive sensing. In addition, the simplicity of the detection system makes possible to choose more complex sensors attached to the integrating spheres, such as fiber spectrometers for performing hyperspectral imaging.