System and method for controlling and adjusting interstitial photodynamic light therapy parameters

A system for providing interstitial photodynamic therapy on tissue in a body, said system comprising:

• at least one therapeutic light source;
• a plurality of optical fibers for delivering a therapeutic light from said at least one therapeutic light source to said tissue for interaction with a photosensitizer agent in said tissue, wherein said plurality of optical fibers are devised to be interstitially inserted into said tissue with a distal end region thereof;
• a diagnostic light source adapted to be coupled to a first optical fiber of said plurality of optical fibers to form a source fiber for delivering diagnostic light to said tissue while second and third fibers of said plurality of optical fibers neighboring said source fiber are employed as detector fibers;
• a device for evaluating at least one of a plurality of photodynamic treatment parameters of said interstitial photodynamic therapy at said distal end region of said optical fibers based on detected light from selected detection fibers of said plurality of optical fibers;
• a device for modifying characteristics of said therapeutic light of said interstitial photodynamic therapy in response to the evaluation of said plurality of photodynamic treatment parameters;
• and
• a control device that is arranged to restrict said delivery of therapeutic light treatment at least temporarily, for at least one optical fiber of said plurality of optical fibers, in dependence of at least one attribute of one of said plurality of photodynamic treatment parameters.