Utilizing an open-microcavity optoacoustic sensor for spectroscopic determination of methemoglobin concentration

Ralph W. Peterson; Kavya Kadugodinandareddy; Vinitha Karunakaran; Casey Whitney; Jian Ling; Jing Yong Ye

doi:10.1117/12.2080119

5 March 2015 Utilizing an open-microcavity optoacoustic sensor for spectroscopic determination of methemoglobin concentration

Ralph W. Peterson, Kavya Kadugodinandareddy, Vinitha Karunakaran, Casey Whitney, Jian Ling, Jing Yong Ye

Author Affiliations +

Proceedings Volume 9319, Optical Tomography and Spectroscopy of Tissue XI; 93191N (2015) https://doi.org/10.1117/12.2080119
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

We present a simple, non-destructive photoacoustic spectroscopy method utilizing a unique open-microcavity optoacoustic sensor to measure the concentration ratio of Methemoglobin (MetHb) in an optically scattering medium. Elevated levels of MetHb, present for example in the blood disorder Methemeglobinemia, cannot be detected by conventional pulse oximetry, and may result in inaccurate arterial oxygen saturation measurements. Samples with different ratios of Oxygenated Hemoglobin (HbO₂), Deoxygenated Hemoglobin (HHb), and MetHb were obtained and mixed with nanoscale latex beads to present an optical scattering effect. Polymer encapsulated hemoglobin (PEH) samples were also studied. A sample chamber containing 20 μL of each sample was positioned directly underneath our patented optoacoustic sensor. Unlike a piezoelectric transducer, our optoacoustic sensor allows an excitation laser beam from an OPO laser to pass through and be absorbed by the sample to produce a photoacoustic signal. The cavity layer of the optoacoustic sensor is exposed directly to the resulting ultrasound signal, which causes an intensity modulation of a HeNe laser that is used to monitor the resonance condition of the sensor. A probe laser beam is total internally reflected off of the sensor and detected with a fiber-coupled APD detector. Three wavelengths are chosen for our excitation laser based on the absorption peaks and isobestic points of HHb, HbO₂, and MetHb. Using established values of the molar extinction coefficients of HbO₂, HHb, and MetHb a set of three simultaneous equations can be solved to accurately determine the concentration ratio of MetHb.

Citation Download Citation

Ralph W. Peterson, Kavya Kadugodinandareddy, Vinitha Karunakaran, Casey Whitney, Jian Ling, and Jing Yong Ye "Utilizing an open-microcavity optoacoustic sensor for spectroscopic determination of methemoglobin concentration", Proc. SPIE 9319, Optical Tomography and Spectroscopy of Tissue XI, 93191N (5 March 2015); https://doi.org/10.1117/12.2080119

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