4 March 2015 In-vivo performance comparison study of wide-field oxygenation imaging methods
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Proceedings Volume 9313, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XIII; 931315 (2015); doi: 10.1117/12.2077651
Event: SPIE BiOS, 2015, San Francisco, California, United States
Abstract
Wide-field oxygenation saturation (StO2) estimates can be clinically very advantageous. Particularly when implemented in a non-contact manner, applications such as intra-operative assessment of tissue perfusion are very promising. Nevertheless, wide-field optical oxygenation imaging did not yet successfully translate to the clinic.

In this work we compare four proposed methods for wide-field imaging that are based on different photon propagation models and that depend on different sets of assumed parameters such as absorption and reduced scattering coefficients. We investigated these for methods, with particular attention to sensitivities to errors in assumed parameters of calibration estimates. To this end we acquired an in vivo time series of a pig skin flap with a venous occlusion. StO2 estimates of all methods were compared to estimates from spatial frequency domain imaging of the same time series.

Correct assumptions on scatter power and accurate calibration were found to be the most important prerequisites for accurate StO2 estimates. Although all models were able to measure relative changes in StO2 when the occlusion was applied and released, only the models that incorporated assumed reduced scattering coefficients estimated StO2 values within 5% of the expected values (estimated using SFDI).

An important aspect of the compared methods is their ability to be used for real-time imaging. With the addition of real-time calibration and robust tissue scattering estimates, real-time wide-field imaging of oxygenation saturation can prove to provide important added value in the clinic.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martijn Van de Giessen, Joseph Angelo, Christina Vargas, Sylvain Gioux, "In-vivo performance comparison study of wide-field oxygenation imaging methods", Proc. SPIE 9313, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XIII, 931315 (4 March 2015); doi: 10.1117/12.2077651; http://dx.doi.org/10.1117/12.2077651
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KEYWORDS
Absorption

Scattering

Calibration

Reflectivity

Tissues

Error analysis

Skin

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