The impossible dose

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Shape of the light profile in illuminated tissue
How long time should I treat This is one of the most frequent questions that come to us. ”I have a laser, 808 nm wavelength, 450 mW diode laser, how long time shall I treat an Achilles tendon” The formula below is recomended by the Swedish Laser-Medical Society. t is treatment time in seconds, D is dose in J/cm 2 , A is area in cm 2 , P is output power from the laser, measured in watt, d is the deep factor with value from 1-4 cm, indicating the approximate depth of the problem to treat. The reason why a linear factor is used instead of an exponential factor is that it accounts for systemic effects. Further an exponental factor would anyway not be more correct, only more complicated for the layman to use and gives easily unrealistic values of the treatment time. We have today a good practical experience in using this formula.
Page 1 and 2: THE IMPOSSIBLE DOSE - HOW CAN SOMET
Page 3 and 4: A two dimensional power distributio
Page 5 and 6: If an injury is situated 2 cm under
Page 7 and 8: I will start from a letter: Dear La
Page 9 and 10: Depending on how we define dose, we
Page 11 and 12: That is the really important "dose"
Page 13 and 14: Further, these things matters mostl
Page 15 and 16: Typical example of the large differ
Page 17 and 18: Let us go one step further: Let us
Page 19 and 20: Three ways of treating Shallow Medi
Page 21: This is an example of stimulatory d
Page 25 and 26: Examples of beam profiles. Looking
Page 27 and 28: Thanks for listening, folks! Lars H
Page 29 and 30: Transilluminated hand with 650 nm l
Page 31 and 32: 5 minutes after treatment (10 minut

The impossible dose

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