Chapter 4
Light Penetration Findings:
High-power NIR lasers (10-15W) demonstrated significantly greater tissue penetration than low-power LED devices (<1W):
0.5W LED devices showed no detectable penetration through 2mm of skin
10W 810/980nm lasers achieved 9-11% penetration through 2mm of skin
15W 810nm lasers achieved up to 33% penetration through the skin
At 3cm depth into brain tissue, 2.9% of energy from 15W 810nm laser penetrated
Pulsed settings improved penetration compared to continuous wave delivery
