Abstract
The correct recognition of laser light distribution on and in the lased tissues is crucial in the therapeutic application of lasers, but there used to be few practically useful techniques to survey the invisible near infrared laser distribution on and in tissues. Charge-coupeled device (CCD) image sensors have extremely high sesitivity for near infrared ray of shorter wave length than 1.2μm, so that the near infrared laser distribution on and in tissues can easily be observed as a visible image using TV camera provided CCD image sensor. This paper confirms that the CCD TV image has the intensity resolution to a near-infrared laser distribution on and in tissues. The clinical applicabilities of these imaging techniques are discussed in this paper. As the results these sensors have so high sensitivity to neare infrared laser that they are applicable even for low power diode lasers and some optical filters are necessary to high power infrared lasers such as Nd: YAG laser.
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