Abstract: Photoacoustic (PA) and thermoacoustic (TA) imaging can share a set of data acquisition and data processing system in addition to different excitation sources. In this paper, a reflection mode PA/TA dual modality imaging based on a hollow concave array is proposed. The PA/TA signals are excited through the holes in the hollow array by using optical fiber and antenna, respectively. The excited light, microwave and received ultrasonic signals are coaxial to form the PA/TA dual modality imaging mode. Through the compensation and calibration of the transducer crystal phase and amplitude of the hollow part of the array, a 3 mm diameter plastic tube filled with 0.9% salt water, safflower oil, human arm, back of hand and instep were successfully imaged. These experimental results show that the PA/TA dual modality imaging technology can provide the optical and microwave absorption distribution of tissues at the same time, which is helpful for the accurate detection of tumor, diabetic foot and other diseases, and has a wide range of clinical application prospects.

Keywords: 
• Photoacoustic/Thermoacoustic, Dual modality imaging, Hollow array, Hand-held