title: Calcium imaging at kHz frame rates resolves millisecond timing in neuronal circuits and varicosities.
abstract: We have configured a widefield fast imaging system that allows imaging at 1000 frames per second (512x512 pixels). The system was extended with custom processing tools including a time correlation method to facilitate the analysis of static subcellular compartments (e.g. neuronal varicosities) with enhanced contrast, as well as a dynamic intensity processing (DIP) algorithm that aids in data size reduction and fast visualization and interpretation of timing and directionality in neuronal circuits. This system, together with our custom developed processing tools enables efficient detection of fast physiological events, such as action potential dependent calcium steps. We show, using a specific blocker of nerve communication, that with this setup it is possible to discriminate between a pre and post synaptic event in an all optical way.
authors.affiliation: Laboratory for Enteric Neuroscience (LENS),TARGID, University of Leuven, O&N 1 Herestraat 49-box 701, Leuven 3000, Belgium.
authors.forename: Michiel A
authors.initials: MA
authors.lastname: Martens
authors.affiliation: Laboratory for Enteric Neuroscience (LENS),TARGID, University of Leuven, O&N 1 Herestraat 49-box 701, Leuven 3000, Belgium.
authors.forename: Werend
authors.initials: W
authors.lastname: Boesmans
authors.affiliation: Laboratory for Enteric Neuroscience (LENS),TARGID, University of Leuven, O&N 1 Herestraat 49-box 701, Leuven 3000, Belgium.
authors.forename: Pieter
authors.initials: P
authors.lastname: Vanden Berghe
keywords: (100.0118) Imaging ultrafast phenomena; (100.2000) Digital image processing; (170.6920) Time-resolved imaging; (330.6790) Temporal discrimination