Optical penetration depth











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A question that often appears throughout the literature asks. Spot size has important clinical implications due to its effect on penetration and light dispersion in tissue. Thus, it seems reasonable that skin has not evolved as a mere sun block but as a sun screen. These photons are given a weight W , which is equal to 1. Ultraviolet radiation may cause negative effects such as erythema, skin ageing and skin cancer. According to Beer-Lambert law , the intensity of an electromagnetic wave inside a material falls off exponentially from the surface as. Introduction Human skin is the interface between man and his environment.

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Depending on the nature of the material, the electromagnetic field might travel very far into the material, or may die out very quickly. This technical note focuses on wavelength, illumination geometry and skin tone and their effect on the energy density fluence distribution within tissue. Scattering leads to light dispersion in the tissue and the eventual reduction in the energy density with increasing depth [ 8 ]. Laser induced tissue reactions and dermatology.

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Effect of wavelength and beam width on penetration in light

Therefore, the actual penetration depths would be less than those found. Results—effect of beam width on penetration depth A key contributor to the penetration depth is the treatment area or spot size employed by the device. However, it will again be noted that there is a lack of information regarding the definition of penetration depth for light therapy. The wavelength of a therapeutic source therefore has a double importance, namely to ensure absorption of the incident photons in the target chromophores and to be able to do so at the depths at which these chromophores exist. Goetzberger, Adolf et.

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Description: Monte Carlo model for determination of the role of heat generation in laser-irradiated tissue. It should be acknowledged also that this model does not take into account the compression of skin when the device is placed on it. Then after this photon is deposited in its final position, a new photon is released and the process is repeated. Eur Acad Dermatol Venereol. It should be noted that the intensities reported in this section are not as a percentage of the incident intensity but as a percentage of the maximum deposited photon energy. the radiation which has escaped the sample is not included in this intensity. Ash C Optimising output dosimetry of a broadband pulsed light source for the removal of unwanted hair, PhD Thesis. The loss in energy at each of the on-going interaction sites is determined by the weight that the photon deposits. However, this may be of irrelevance due to the slight pressure applied when using the device and also the fact that a coupling gel is applied between the device and the skin, though it would be interesting to identify the effect of this compression on penetration depth. Therefore, the actual penetration depths would be less than those found. Laser induced tissue reactions and dermatology.
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