Patent ID: 8433384

Claim:
A method for measuring oxygen level in a human brain comprising: generating a digital modulation signal associated with a code sequence; generating a modulated optical signal based on said digital modulation signal; transmitting said modulated optical signal to said human brain; receiving a modified version of said modulated optical signal after transmission through said human brain; deriving a temporal transfer characteristic for said modified version of said modulated optical signal; calculating said oxygen level based on said temporal transfer characteristic; delaying said code sequence to generate a second code sequence; generating a second digital modulation signal associated with said second code sequence; generating a second modulated optical signal based on said second digital modulation signal; transmitting said second modulated optical signal to said human brain; receiving a second modified version of said second modulated optical signal after transmission through said human brain; and deriving a second temporal transfer characteristic for said second modified version of said second modulated optical signal.