Abstract
Recent years, a NIR Fluorescence Biomedical Imaging (FBI) is attracting attention. Wavelength range between 900 and 2500 nm is that where optical losses by scattering and infrared absorption diminish in biological objects. By using NIR for endoscope, it is possible to observe arteries and veins under the skin and indicate blood constitutes of in the brain. If an endoscope makes use of NIR, it is possible to observe of in vivo deeply and lead to early discovery of cancer and so on. Furthermore, NIR has high penetrating as compared with thickness of alimentary canal, the NIR endoscope can observe of kidney and liver from alimentary canal. However an existed endoscope using Si-CCD camera cannot capture over 1000 nm (OTN) wavelength. In this paper, we propose the head-scanning mechanism for a NIR endoscope which is able to capture OTN wavelength. The head-scanning mechanism mainly consists of a photodetector and a 2-D Micro Electro Mechanical System (MEMS) mirror. NIR laser is irradiated and scanned 2-D surface in vivo deeply by the 2-D MEMS mirror. The reflection light is captured by the photodetector. Image scanning experiments on different wavelength were conducted by using the proposed head-scanning mechanism. And we examined to scan fluorescence which emits OTN light by RED-CNP. The experimental results suggest that the proposed method is able to capture OTN-NIR image and is useful for observe of in vivo deeply.
