We report the development of a fluorescence lifetime imaging (FLIM) system based on a time-gated image intensifier and solid-state laser amplifier with a system response of < 100 ps. We have sued this system to image lifetimes as short as 100 ps and to image changes in the environment of a fluorescent phantom, causing lifetime differences less than 10 ps. The versatility of this FLIM system has been demonstrated by measuring both the temporal and spectral profiles of multiple fluorescent samples in a single acquisition. Fluorescence lifetime imaging of tissue constituents has also been carried out and first results suggest that this technique can provide a means of distinguishing between different tissue constituents.
We report the development of a high temporal resolution fluorescence lifetime imaging (FLIM) system suing a time- gated image intensifier to provide whole field FLIM images. The gate width has been optimized to 110 ps, and changes in the environment of a fluorescent phantom, causing lifetime differences of 20 ps, have been detected. Environmental changes of the fluorescent indicator, Lucifer Yellow, have been sensed by measuring changes in its fluorescence lifetime in the presence of the protein albumin. We also present provisional fluorescence lifetime images of tissue constituents.
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