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In Vivo Integrated Photoacoustic And Confocal Microscopy Of Hemoglobin Oxygen Saturation And Oxygen Partial Pressure.

Y. Wang, S. Hu, K. Maslov, Y. Zhang, Y. Xia, L. Wang
Published 2011 · Chemistry, Medicine

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We developed dual-modality microscope integrating photoacoustic microscopy (PAM) and fluorescence confocal microscopy (FCM) to noninvasively image hemoglobin oxygen saturation (sO₂) and oxygen partial pressure (pO₂) in vivo in single blood vessels with high spatial resolution. While PAM measures sO₂ by imaging hemoglobin optical absorption at two wavelengths, FCM quantifies pO₂ using phosphorescence quenching. The variations of sO₂ and pO₂ values in multiple orders of vessel branches under hyperoxic (100% oxygen) and normoxic (21% oxygen) conditions correlate well with the oxygen-hemoglobin dissociation curve. In addition, the total concentration of hemoglobin is imaged by PAM at an isosbestic wavelength.
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