Biomedical issues in vasculogenesis and cardiogenesis require methods to follow hemodynamics with high spatial (micrometers) and time (milliseconds) resolution. At the same time, we need to follow relevant morphogenetic processes on large fields of view. Fluorescence cross-correlation spectroscopy coupled to scanning or wide-field microscopy meets these needs but has limited flexibility in the excitation pattern. To overcome this limitation, we develop here a two-photon two-spots setup coupled to an all-reflective near-infrared (NIR) optimized scanning system and to an electron multiplying charge-coupled device. Two NIR laser spots are spaced at adjustable micron-size distances (1 to 50 ìm) by means of a Twyman-Green interferometer and repeatedly scanned on the sample, allowing acquisition of information on flows at 4 ms-3 ìm time-space resolution in parallel on an extended field of view. We analyze the effect of nonhomogeneous and variable flow on the cross-correlation function by numerical simulations and show exemplary application of this setup in studies of blood flow in zebrafish embryos in vivo. By coupling the interferometer with the scanning mirrors and by computing the cross-correlation function of fluorescent red blood cells, we are able to map speed patterns in embryos' vessels. © 2014 Society of Photo-Optical Instrumentation Engineers.

Pozzi, P., Sironi, L., D'Alfonso, L., Bouzin, M., Collini, M., Chirico, G., et al. (2014). Electron multiplying charge-coupled device-based fluorescence crosscorrelation spectroscopy for blood velocimetry on zebrafish embryos. JOURNAL OF BIOMEDICAL OPTICS, 19(6) [10.1117/1.JBO.19.6.067007].

Electron multiplying charge-coupled device-based fluorescence crosscorrelation spectroscopy for blood velocimetry on zebrafish embryos

POZZI, PAOLO;SIRONI, LAURA;D'ALFONSO, LAURA;BOUZIN, MARGAUX;COLLINI, MADDALENA;CHIRICO, GIUSEPPE
;
2014

Abstract

Biomedical issues in vasculogenesis and cardiogenesis require methods to follow hemodynamics with high spatial (micrometers) and time (milliseconds) resolution. At the same time, we need to follow relevant morphogenetic processes on large fields of view. Fluorescence cross-correlation spectroscopy coupled to scanning or wide-field microscopy meets these needs but has limited flexibility in the excitation pattern. To overcome this limitation, we develop here a two-photon two-spots setup coupled to an all-reflective near-infrared (NIR) optimized scanning system and to an electron multiplying charge-coupled device. Two NIR laser spots are spaced at adjustable micron-size distances (1 to 50 ìm) by means of a Twyman-Green interferometer and repeatedly scanned on the sample, allowing acquisition of information on flows at 4 ms-3 ìm time-space resolution in parallel on an extended field of view. We analyze the effect of nonhomogeneous and variable flow on the cross-correlation function by numerical simulations and show exemplary application of this setup in studies of blood flow in zebrafish embryos in vivo. By coupling the interferometer with the scanning mirrors and by computing the cross-correlation function of fluorescent red blood cells, we are able to map speed patterns in embryos' vessels. © 2014 Society of Photo-Optical Instrumentation Engineers.
Articolo in rivista - Articolo scientifico
Fluorescence Correlation, Optical Microscopy; hemodynamics, Zebrafish;
English
2014
19
6
067007
none
Pozzi, P., Sironi, L., D'Alfonso, L., Bouzin, M., Collini, M., Chirico, G., et al. (2014). Electron multiplying charge-coupled device-based fluorescence crosscorrelation spectroscopy for blood velocimetry on zebrafish embryos. JOURNAL OF BIOMEDICAL OPTICS, 19(6) [10.1117/1.JBO.19.6.067007].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/52443
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