How does light penetration depth relate to therapeutic efficacy across different brain regions and pathologies?

photobiomodulation open
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Description

The abstract identifies exponential light attenuation as a major challenge for transcranial PBM but doesn’t explain how penetration depth correlates with therapeutic outcomes. This knowledge gap is critical for optimizing dosing protocols and determining which conditions can be effectively treated transcranially versus requiring invasive delivery methods.

Gap type: open_question Source paper: Brain Photobiomodulation Therapy: a Narrative Review. (2018, Molecular neurobiology, PMID:29327206)

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