Differential path length factor

Definition: The differential path length factor (DPF) is a unitless factor that accounts for the differential pathlength of photon travel in human tissue. The DPF is calculated by dividing the mean optical pathlength by the distance between the emitter and detector. The DPF depends on age, gender, and wavelength.

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References:

https://doi: 10.3389/fninf.2018.00037

https://doi.org/10.1016/j.neuroimage.2013.05.004

https://doi.org/10.1088/0031-9155/33/12/008

Related terms: Source-detector separation distance, Modified Beer Lambert law, Differential path length, Partial pathlength factor.