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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 4, Iss. 8 — Aug. 1, 2013
  • pp: 1255–1268

Compartment-resolved imaging of cortical functional hyperemia with OCT angiography

Harsha Radhakrishnan and Vivek J. Srinivasan  »View Author Affiliations


Biomedical Optics Express, Vol. 4, Issue 8, pp. 1255-1268 (2013)
http://dx.doi.org/10.1364/BOE.4.001255


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Abstract

Optical Coherence Tomography (OCT) angiography was applied to image functional hyperemia in different vascular compartments in the rat somatosensory cortex. Dynamic backscattering changes, indicative of changes in dynamic red blood cell (dRBC) content, were used to monitor the hemodynamic response. Three-dimensional movies depicting the microvascular response to neuronal activation were created for the first time. An increase in the attenuation coefficient during activation was identified, and a simple normalization procedure was proposed to correct for it. This procedure was applied to determine compartment-resolved backscattering changes caused by dRBC content changes during functional activation. Increases in dRBC content were observed in all vascular compartments (arterial, arteriolar, capillary, and venular), with the largest responses found in the arterial and arteriolar compartments. dRBC content increased with dilation in arteries but with barely detectable dilation in veins. dRBC content increased in capillaries without significant “all or none” capillary recruitment.

© 2013 OSA

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(170.0180) Medical optics and biotechnology : Microscopy
(170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6900) Medical optics and biotechnology : Three-dimensional microscopy
(290.1350) Scattering : Backscattering

ToC Category:
Optical Coherence Tomography

History
Original Manuscript: March 7, 2013
Revised Manuscript: June 10, 2013
Manuscript Accepted: June 13, 2013
Published: July 2, 2013

Virtual Issues
August 2, 2013 Spotlight on Optics

Citation
Harsha Radhakrishnan and Vivek J. Srinivasan, "Compartment-resolved imaging of cortical functional hyperemia with OCT angiography," Biomed. Opt. Express 4, 1255-1268 (2013)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-4-8-1255


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