Biological tissue  
    White Gray Skull
Study Parameter matter matter  
Simpson et al. (1998) μa [mm-1] 0.003 - 0.01 0.032 – 0.038  
  μs[mm-1] 9.26 – 7.78 2.64 - 2  
Firbank et al. (1993) μa[mm-1]     0.02 - 0.05
  μs[mm-1]     35 - 25
Table 2: Optical absorption and scattering coefficient in the human brain.
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