Fig. 1.

A schematic of the experimental system. (a) The hardware components employed in the PAT system and NIRS system. DAQ: Data Acquisition System (preamplifiers, multiplexers and analog-to-digital converters). OPO: optical parametric oscillator; PC: personal computer; NIRS system: data acquisition system for NIRS. (b) Detail of the imaging probe. It contained a 128-element transducer array, a fiber bundle and a resin shell enclosed with a PDMS film. (c) The LEDs and PD were placed at the same region of interest as the PAT probe at an interval of 2 cm.