Preparation of the patient skin
The skin to be treated is cleaned to lower the skin resistance. Gels sprays or water is applied to the skin to lower the resistance
Calculation of doses
The tissue dose is expressed by energy density measured in Joules per cm2. Produced energy is obtained by multiplying the laser output power in milliwatts by exposition time in seconds. For e.g. irradiation area is 0.5cm2, 2 J is divided by 0.5cm2. The time of exposure and the dose becomes 4J/CM2.
The dose is most affected by the size of the laser probe, a slim probe will result in high doses of joules per cm2, but this does not mean that energy applied on the tissue is high, although the intensity of the light the energy emitted at the end of the slim probe is high, but not the dose in the depth
Depth of penetration
He-Ne laser energy: Absorbed rapidly in the superficial structures, especially within the first 2-5mm of tissue. The He-Ne has an indirect effect on the tissues up to 8-10mm.
GaAs laser energy: Ga-As laser which has a longer wavelength is directly absorbed in tissues at depths of 1-2cm and has an indirect effect up to 5cm.
Contact technique: Gas is only given for trigger points and around wounds
Non-contact technique: For He-Ne and Ga-As for healing of wounds and for stimulation of wound beds.