Effect of hindpaw electrical stimulation on capillary flow heterogeneity and oxygen delivery (Conference Presentation)

Yuandong Li; Wei Wei; Chenxi Li; Ruikang K. Wang

doi:10.1117/12.2253328

19 April 2017 Effect of hindpaw electrical stimulation on capillary flow heterogeneity and oxygen delivery (Conference Presentation)

Yuandong Li, Wei Wei, Chenxi Li, Ruikang K. Wang

Author Affiliations +

Proceedings Volume 10051, Neural Imaging and Sensing; 1005102 (2017) https://doi.org/10.1117/12.2253328
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

We report a novel use of optical coherence tomography (OCT) based angiography to visualize and quantify dynamic response of cerebral capillary flow pattern in mice upon hindpaw electrical stimulation through the measurement of the capillary transit-time heterogeneity (CTH) and capillary mean transit time (MTT) in a wide dynamic range of a great number of vessels in vivo. The OCT system was developed to have a central wavelength of 1310 nm, a spatial resolution of ~8 µm and a system dynamic range of ~105 dB at an imaging rate of 92 kHz. The mapping of dynamic cerebral microcirculations was enabled by optical microangiography protocol. From the imaging results, the spatial homogenization of capillary velocity (decreased CTH) was observed in the region of interest (ROI) corresponding to the stimulation, along with an increase in the MTT in the ROI to maintain sufficient oxygen exchange within the brain tissue during functional activation. We validated the oxygen consumption due to an increase of the MTT through demonstrating an increase in the deoxygenated hemoglobin (HbR) during the stimulation by the use of laser speckle contrast imaging.

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Yuandong Li, Wei Wei, Chenxi Li, and Ruikang K. Wang "Effect of hindpaw electrical stimulation on capillary flow heterogeneity and oxygen delivery (Conference Presentation)", Proc. SPIE 10051, Neural Imaging and Sensing, 1005102 (19 April 2017); https://doi.org/10.1117/12.2253328

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KEYWORDS

Capillaries

Oxygen

Imaging systems

Optical coherence tomography

Angiography

Dynamical systems

In vivo imaging

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