Spatial frequency domain spectroscopy imaging using a snap-shot filter mosaic camera compared to a multi-camera system with band-pass filters (Conference Presentation)

Tomas Stroemberg; Hanna Jonasson; Ingemar Fredriksson; Göran Salerud; Rolf B. Saager; Marcus Larsson

doi:10.1117/12.2508915

4 March 2019 Spatial frequency domain spectroscopy imaging using a snap-shot filter mosaic camera compared to a multi-camera system with band-pass filters (Conference Presentation)

Tomas Stroemberg, Hanna Jonasson, Ingemar Fredriksson, Göran Salerud, Rolf B. Saager, Marcus Larsson

Author Affiliations +

Proceedings Volume 10851, Photonics in Dermatology and Plastic Surgery 2019; 108510R (2019) https://doi.org/10.1117/12.2508915
Event: SPIE BiOS, 2019, San Francisco, California, United States

Abstract

Spectroscopic imaging of human tissue analyzes backscattered light intensity separated by wavelength. We used a DLP-projector illuminating sinusoidal patterns with varying phase and varying spatial frequency on forearm skin. Detection was done with: 1) a snap-shot filter mosaic camera with 16 wide-band sensitive pixels; 2-3) a four cameras setup with narrow and wide bandwidth optical bandpass filters in the 450-700 nm range, respectively. The detected images were processed with a demodulation scheme, assessing tissue optical parameters, involving light absorption. Calibration was done using an optical phantom with known optical properties. From the absorption coefficient the concentration of skin blood and its oxygenation was determined. We will present results from forearm arterial occlusion and release experiments using the three setups above. Specifically, the effect of the filter bandwidth will be evaluated using data from the multi-camera setups. Furthermore, the snap-shot filter mosaic camera data may be explained by the calculation of modulation using an illumination and detector setup with a broad spectral transmission bandwidth, with considerable variation in μ_a of included chromophores. Approaches for either reducing the effective bandwidth of the filters or by including their characteristic in a light transport model for SFDI modulation, will be proposed.

Conference Presentation

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Tomas Stroemberg, Hanna Jonasson, Ingemar Fredriksson, Göran Salerud, Rolf B. Saager, and Marcus Larsson "Spatial frequency domain spectroscopy imaging using a snap-shot filter mosaic camera compared to a multi-camera system with band-pass filters (Conference Presentation)", Proc. SPIE 10851, Photonics in Dermatology and Plastic Surgery 2019, 108510R (4 March 2019); https://doi.org/10.1117/12.2508915

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KEYWORDS

Bandpass filters

Optical filters

Cameras

Imaging spectroscopy

Image filtering

Imaging systems

Linear filtering

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