  The literature on reconstruction formulas for photoacoustic tomography (PAT)
is vast. The various reconstruction formulas differ by used measurement devices
and geometry on which the data are sampled. In standard photoacoustic imaging
(PAI), the object under investigation is illuminated uniformly. Recently,
sectional photoacoustic imaging techniques, using focusing techniques for
initializing and measuring the pressure along a plane, appeared in the
literature. This paper surveys existing and provides novel exact reconstruction
formulas for sectional photoacoustic imaging.
