Optical calcium imaging has been widely used in neuroscience. However, a major limitation of optical measurement is the limited imaging depth in live mammalian brain tissue. Although miniature optical imaging probes have been employed to access the deep brain regions, their imaging field-of-view is very limited, resulting in low measurement throughput and success rate. Recently, we have developed the Clear Optically Matched Panoramic Access Channel Technique (COMPACT), which can improve the tissue access volume by two to three orders of magnitude. Here, we present our latest results of 0.5 mm diameter COMPACT systems.
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