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* Principle of Photodynamic Diagnosis
Photodynamic diagnosis (PDD) is a method to diagnose the possibility of cancer, both by the principle that if a photosensitizer is injected into an organic tissue, it is accumulated in the tissue of a malignant tumor selectively after a specific period, and by a comparison of the intensity of the fluorescence of normal tissue with abnormal tissue after investigating the excitation light of a tissue with accumulated photosensitizer.
Currently, there are two methods of PDD: The first is a way to acquire incitement fluorescence by using a photosensitizer, and the second is a way to use auto-fluorescence by green fluorescence protein (GFP) and red fluorescence protein (RFP) such as NADH+ active factors within the organic body. Since the selection of the wavelength band of excitation light has an interrelation with fluorescence generation according to the selection of a photosensitizer, it plays an important role in PDD.

* Photodynamic Diagnostic (PDD) Systems

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                       Research In The Our Department               Photodynamic Therapy (PDT)           Tissue Optics