近赤外線イメージングによる皮下異物の検出実験

概要

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The wavelength range of the near infrared (NIR) light is called `water window. The superficial vascular imaging system using near infrared light sources was developed as those using both the reflected light and transmitted light. An NIR-sensitive CCD camera was surrounded by approximately sixty light emitting diodes (LEDs) , which have alternating wavelengths of 700 (visible light) , 760, 810 and 940nm, respectively. The camera detected the reflected NIR from superficial subcutaneous tissues at the palm and back of hands, and the wrist. Differences between wavelengths were significantly observed. Images taken at 940 nm the most clearly showed the vascular vessels at insides of these regions. As an application of the NIR imaging system, we examined whether the system was the beneficial tool for finding superficial subcutaneous foreign bodies or not. Twelve light sources of 940 nm LEDs were aligned for the transmission imaging. The alien substance examined was a mechanical pencil lead with 0.5 mm diameter. Chicken and pork meats (approx. 1 to 10 mm in thickness) were used instead of human skin. The thickness and fat contents were affected on the detection. As results, the NIR imaging was thought to be the beneficial tool for finding subcutaneous alien substances detection.