Imaging assessment of photosensitizer emission induced by radionuclide-derived Cherenkov radiation using charge-coupled device optical imaging and long-pass filters

Figure 2 Chemical structure and photo-physical properties of tetrakis (4-carboxyphenyl) porphyrin. A: Chemical structure of tetrakis (4-carboxyphenyl) porphyrin (TCPP); B: Absorption spectrum of TCPP (100 µmol/L) at 25°C in phosphate buffer; C: Three-dimensional fluorescence spectral analysis of TCPP. Fluorescence emission was observed around 670 nm with an excitation wavelength of 430 nm. Em: Emission wavelength; Ex: Excitation wavelength; MW: Molecular weight; μM: μmol/L.