Abstract

The integration of fibre optics into an imaging system for the convenient delivery and collection of light has resulted in many hybrid forms of novel biomedical optical instrumentation. Although it is extremely robust and cost effective, fibre integration requires special consideration in a time-domain fluorescence lifetime imaging schema where multipath propagation in the fibre causes significant spread in photon transit times. In this study, we investigated the effect of the length of a multimode collection fibre on the temporal performance of a multichannel fluorescence lifetime microscope and demonstrated the effectiveness of a photonic crystal fibre as a means of optimizing the collection and delivery of emitted fluorescence in terms of temporal resolution. The findings are pertinent to all studies that employ a multimode optical fibre to collect and deliver an emitted fluorescence signal from a sample to a remote detector for measurement of the characteristic fluorescence lifetime.

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