Laser Dermatology by David J. Goldberg

Author:David J. Goldberg
Language: eng
Format: epub, pdf
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

Spot Size

Large diameter laser exposure spots (e.g., >10 mm) are associated with substantially less loss of energy intensity with depth of dermal penetration as compared to small-diameter exposure spots. This is because optical scattering by dermal collagen causes light to diffuse as it penetrates into the dermis. The larger the spot the less is the associated scattering.

Fluence

In general, higher delivered laser fluences lead to better laser hair removal results. However, the higher the utilized fluence, the greater the ­discomfort and risk of complications. The effective fluence for any one area of hair is determined mainly by hair color, whereas the tolerated fluence is determined mainly by skin color.

The tolerance fluence can be increased substantially by various means, such as cooling the skin surface before, during, and/or after the ­optical pulse.

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