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(a) Schematic of the optical coherence tomography (OCT)-fluorescence system. Black line denotes single-mode fiber (SMF28), red line denotes multimode fiber, and blue line denotes double-clad fiber (DCF). (b) Intravascular probe based on a DCF combiner. OCT and fluorescence excitation light are transported through the single-mode core of the DCF; the back-reflected fluorescence emission light is collected through the inner cladding of the DCF.
