  Photoacoustic imaging is an emerging technology based on the photoacoustic
effect that has developed rapidly in recent years. It combines the high
contrast of optical imaging and the high penetration and high resolution of
acoustic imaging. As a non-destructive biological tissue imaging technology,
photoacoustic imaging has important application value in the field of
biomedicine. With its high efficiency bi-oimaging capabilities and excellent
biosafety performance, it has been favored by researchers. The visualization of
photoacoustic imaging has great research signifi-cance in the early diagnosis
of some diseases, especially tumors. In photoacoustic imaging, light
transmission and thermal effects are important processes. This article is based
on COMSOL software and uses finite element analysis to construct a physi-cal
model for simulation. Through laser pulses into the stomach tissue containing
tumor, the physical process of light transmission and biological heat transfer
was studied, and a photothermal model composed of two physical fields was
built, and finally a series of visualization graphics were obtained. This work
has certain theo-retical guiding significance for further promoting the
application of photoacoustic imaging in the field of biomedicine.
