  In this paper, we propose a hybrid method to reconstruct the absorption
coefficient by fluorescence photoacoustic tomography (FPAT), which combines a
squeeze iterative method (SIM) and a nonlinear optimization method. The SIM is
to use two monotonic sequences to squeeze the exact coefficient, and it quickly
locates near the exact coefficient. The nonlinear optimization method is
utilized to attain a higher accuracy. The hybrid method inherits the advantages
of each method with higher accuracy and faster convergence. The hybrid
reconstruction method is also suitable for multi-measurement. Numerical
experiments show that the hybrid method converges faster than the optimization
method in multi-measurement case, and that the accuracy is also higher in
one-measurement case.
