Clinical PAT platforms for human breast imaging. (a) LOIS-64 PAT system (112). (b) the modified Philips iU22 system (118). (c) Twente PA mammoscope (119). ADC, analog to digital convertor; DAS, data acquisition system; ES, element selection; GW, glass window; MP, microprocessor; USTA, ultrasonic transducer array. Reprint with permission from Refs. (112; 118; 119).