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Schematic of the dual modality OCT/PAT system. DAQ: data acquisition device; Ct: counter; PD: photodiode; AC & DC: the two output channels of the transimpedance amplifier using the PD; Ref.: reference; AI: analog input; AO: analog output; FPI: Fabry-Perot interferometer; FM: flip mirror; DBD: dual balanced detector. Adapted from [23].
