Abstract: A severity rating system and method for port-wine stains (PWS), the system comprising: an indicator selection and assignment module, an indicator processing module, and a rating module. The indicator selection and assignment module selects rating indicators for divided rating ranges and assigns values to the indicators, the indicator processing module scores the severity of a PWS, and the rating module rates the severity. The severity rating system and method for PWS comprehensively, completely and objectively consider multiple factors that reflect the severity of PWS; in addition, the accuracy and reproducibility of the rating results are high.

Abstract: A method of using photodynamic therapy to perform selective targeted therapy of biological tissue. The method includes intravenously injecting a porphyrin-based photosensitizing drug followed by irradiating the tissue with light while the drug is being injected. The duration of the irradiation and other parameters are controlled so that the selected biological tissue is treated and non-selected tissue is not damaged. By controlling the flow rate of the injection and other parameters, so that irradiation of the effected tissue overlaps with injection of drug, the target tissue is effectively treated without damage to non-target tissue.