Abstract

We observed and discussed the effects of Free Electron Laser (FEL) irradiation to cholesterol accumulated in the regions of arteriosclerosis in the human carotid artery, by an Infrared micro spectroscopy (FT-IR). As a result of this study, we found that we could selectively remove cholesterol only without effects to normal parts of the human body, in irradiating 5.75 μm-FEL that come from a ester bond of cholesterol ester, under the condition that average power is 5 mW, power density is ∼16 W/cm2 and irradiation time is 30∼180 sec.

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