N₂ dye laser photoradiation therapy

(3rd report)

Abstract

N₂ and Ar dye laser were irradiated at dog's liver surface after 5mg/kg HpD administration and the following results were obtained.
1) The depth of tissue damage due to photoradiation therapy (PRT) is not always in proportion to the total energy. Low power and long time irradiation is more effective for the same total irradiated energy.
2) Under the same average power, N₂ dye laser (pulse wave laser) is more effective than Ar dye laser (continuous wave laser) for depth of PRT.
3) Respiration of 100% oxygen is not more effective than that of room air in PRT.
But further examination is needed because the rise of oxygen concentration in the tissue has not been assessed.