ABSTRACT
This chapter presents an overview of the photochemical interaction mechanisms and the research into the underlying dynamics.
All photochemical interactions as well rely on the ease with which light can be delivered to a specific location in a biological medium and attain the critical fluence rate to induce the chemical reaction, particularly at greater depths. The light will often need to pass through healthy tissues before reaching the target volume, and the optical properties of these tissues may not necessarily be the same at the specifically desired excitation wavelength. This will impose certain restrictions on the maximally allowable depth of treatment.
