Stimulation of Violet Lasers to Traditional Chinese Medicine Photosensitizer for Diagnosis of Early-stage Gastric Cancer

摘要

The traditional Chinese medicine photosensitizer (CpD_4) gives off the red fluorescence at a central wavelength 660nm under the stimulation of the violet laser at 405nm. The red fluorescence can penetrate into the tissues deeply, not only in the diagnostic test, but in the treatment as well. The characteristic absorption spectrum and fluorescence emission spectrum of the traditional Chinese medicine photosensitizer are measured, and two violet light sources matching with the spectrums are proposed as well. One is 'Hg-Xe' lamp with a special configuration at 433nm at the peak power, and the other is violet LD with a wavelength 405nm at the peak power, which exactly matches the absorption peak of the traditional Chinese medicine photosensitizer.