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. 2017 Feb 27;7:43217. doi: 10.1038/srep43217

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(a) System schematic showing key components (see text for details). Two cameras and two LED light sources are used to image the heart from each point-of-view (green arrows: excitation light, red arrows: fluorescence emission light). One of the two cameras (CAM 1/CAM 3) is used to image transmembrane voltage while the other (CAM 2/CAM 4) is used to image intracellular free calcium. (b) Bird’s-eye view of the imaging and illumination subsystems outlined in (a).