30, 20, and 10 Years Ago in OPN

“The emerging need for economical, safe and rapid methods of tissue imaging may best be met by optical tomography of brain, breast, skeletal muscle and possibly internal organs. The key to the emergence of this new field has been the theoretical formation and the experimental verification of photon migration through human and animal tissues, initially the cat brain and soon thereafter, the adult human brain and skeletal muscle … [M]odest light input power can create signal-to-noise ratios of 10², with averaging times of less than a minute for photon migration through skin, skull and brain tissue or correspondingly large volumes of breast tissue.”