What have we done with photoacoustic tomography?
Photoacoustic imaging
Given the heating function 



H
(



r
→



,
t
)


{\displaystyle H({\vec {r}},t)}

, the generation and propagation of photoacoustic wave pressure 



p
(



r
→



,
t
)


{\displaystyle p({\vec {r}},t)}

 in an acoustically homogeneous inviscid medium is governed by