keywords AIPcS(4) DOSIMETRY Engineering Engineering, Biomedical INVIVO Imaging Science & Photographic Technology OPTICAL-PROPERTIES Optics PHOTODYNAMIC THERAPY PHOTOSENSITIZERS PHTHALOCYANINE Physical Sciences QUANTIFICATION SPECTROSCOPY Science & Technology TISSUE TPPS4 TURBID MEDIA Technology diffusion theory fluorescence fluorophore photofrin reflectance spectroscopy