title: Ultra-fast multispectral optical imaging of cortical oxygenation, blood flow, and intracellular calcium dynamics.
abstract: Camera-based optical imaging of the exposed brain allows cortical hemodynamic responses to stimulation to be examined. Typical multispectral imaging systems utilize a camera and illumination at several wavelengths, allowing discrimination between changes in oxy- and deoxyhemoglobin concentration. However, most multispectral imaging systems utilize white light sources and mechanical filter wheels to multiplex illumination wavelengths, which are slow and difficult to synchronize at high frame rates. We present a new LED-based system capable of high-resolution multispectral imaging at frame rates exceeding 220 Hz. This improved performance enables simultaneous visualization of hemoglobin oxygenation dynamics within single vessels, changes in vessel diameters, blood flow dynamics from the motion of erythrocytes, and dynamically changing fluorescence.
authors.affiliation: Laboratory for Functional Optical Imaging, Departments of Biomedical Engineering and Radiology, Columbia University, New York, NY 10027, USA. mb2936@columbia.edu
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Bouchard
authors.forename: Brenda R
authors.initials: BR
authors.lastname: Chen
authors.forename: Sean A
authors.initials: SA
authors.lastname: Burgess
authors.forename: Elizabeth M C
authors.initials: EM
authors.lastname: Hillman
mesh_terms: D020013:Calcium Signaling / Q000502:physiology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008029:Lighting / Q000295:instrumentation*; D010101:Oxygen Consumption / Q000502:physiology*; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*