鍾德元

Conventionally, a photoacoustic(PA) image is obtained by directly arranging both of the information of time and amplitude of PA signals for each position in the space. Therefore, only the distribution of the amplitude of the PA field can be reconstructed. However, not only the distribution of the amplitude but the distribution of the phase can be rebuilt based on the scalar diffraction theory in this research. The distribution of the phase reveals the direction of propagation of the PA field. Consequently, in this work, the PA image contains both of the amplitude of the PA field and the direction of propagation of the wavefront of the PA field. The PA images of a single point, a line and a double-point can be restored by scanning the PA field reflected by a parabolic reflector and calulating by the scalar diffraction theory. In addition, the 3D image of the PA field was also achieved by using the same concept.