Can laser light actually pass through the skull?

Laser and LED light therapy–or photobiomodulation (PBM)–is a revolutionary new technique for treating a host of neurological and pain associated disorders, including TBI and stroke. A study published in Lasers in Surgery and Medicine demonstrated a therapeutic dose of energy-stimulating photons can reach brain diseased brain tissue using rather atypical patients–human cadavers. In light of new evidence, will doctors change how they treat neurological diseases?

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Tedford, C. E., DeLapp, S. , Jacques, S. and Anders, J. (2015), Quantitative analysis of transcranial and intraparenchymal light penetration in human cadaver brain tissue. Lasers Surg. Med., 47: 312-322. doi:10.1002/lsm.22343

Hamblin, Michael R. “Photobiomodulation for traumatic brain injury and stroke.” Journal of neuroscience research 96.4 (2018): 731-743. doi:10.1002/jnr.24190

Saltmarche AE, Naeser MA, Ho KF, Hamblin MR, Lim L. Significant Improvement in Cognition in Mild to Moderately Severe Dementia Cases Treated with Transcranial Plus Intranasal Photobiomodulation: Case Series Report. Photomed Laser Surg. 2017 Aug;35(8):432-441. doi: 10.1089/pho.2016.4227. Epub 2017 Feb 10.

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