TY - GEN
T1 - Probabilistic independent component analysis for laser speckle contrast images reveals in vivo multi - Component vascular responses to forepaw stimulation
AU - Li, Nan
AU - Pelled, Galit
AU - Thakor, Nitish V.
PY - 2010
Y1 - 2010
N2 - Brain's functional response can be studied by observing the spatiotemporal dynamics of functional and structural changes in cerebral vasculature. However, very few studies explore detailed changes at the level of individual microvessels while revealing the simultaneous wide field view of microcirculation responses to functional stimulation. Here we use a high spatiotemporal resolution laser speckle contrast imaging method, in combination with probabilistic independent component analysis to reveal the changes of cerebral blood flow pattern in response to electrical forepaw stimulation in an anesthetized rat model. The proposed method is able to pick up the response of a single vessel down to ∼20μm diameter in a 4mm × 4mm field of view, and automatically extract response from multiple vascular components. Two main vascular components, arteriolar and capillary responses respectively, show significantly different temporal dynamics. Overall, the experimental results from five rats reveal that the specific arteriole branch proximal to the activation sites dilate prior consistently to the increase of blood flow in the capillaries with a latency time 0.91±0.05s. The presented results provide novel microscopic scale evidence of the contribution of different vascular compartments in the hemodynamic response to neuronal activation.
AB - Brain's functional response can be studied by observing the spatiotemporal dynamics of functional and structural changes in cerebral vasculature. However, very few studies explore detailed changes at the level of individual microvessels while revealing the simultaneous wide field view of microcirculation responses to functional stimulation. Here we use a high spatiotemporal resolution laser speckle contrast imaging method, in combination with probabilistic independent component analysis to reveal the changes of cerebral blood flow pattern in response to electrical forepaw stimulation in an anesthetized rat model. The proposed method is able to pick up the response of a single vessel down to ∼20μm diameter in a 4mm × 4mm field of view, and automatically extract response from multiple vascular components. Two main vascular components, arteriolar and capillary responses respectively, show significantly different temporal dynamics. Overall, the experimental results from five rats reveal that the specific arteriole branch proximal to the activation sites dilate prior consistently to the increase of blood flow in the capillaries with a latency time 0.91±0.05s. The presented results provide novel microscopic scale evidence of the contribution of different vascular compartments in the hemodynamic response to neuronal activation.
UR - http://www.scopus.com/inward/record.url?scp=78650844042&partnerID=8YFLogxK
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U2 - 10.1109/IEMBS.2010.5627526
DO - 10.1109/IEMBS.2010.5627526
M3 - Conference contribution
C2 - 21096788
AN - SCOPUS:78650844042
SN - 9781424441235
T3 - 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
SP - 1982
EP - 1985
BT - 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
T2 - 2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
Y2 - 31 August 2010 through 4 September 2010
ER -