| http://www.w3.org/ns/prov#value | - By exciting the photoactivating drug with the light diffusing quartz fiber 27 and by measuring of the resultant fluorescence spectrum via one or more optical sensing fibers 40 incorporated onto or into the material of the balloon of the laser catheter 1, it is possible to determine the concentration of photoactivating drug present in the bladder wall or other tissue being treated by phototherapy.
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