Abstract
In tumor localization based on the tumor-seeking properties of hematoporphyrin derivative (HpD),1 induced red fluorescence at wavelengths λ > 600 nm is normally observed. However, there is frequently a background red fluorescence even in the absence of HpD injection. A much improved contrast between tumor tissue and normal tissue can be achieved if simple functions of fluorescence intensities of different wavelengths are monitored.2
© 1984 Optical Society of America
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