A method and system for imaging of a scattering target medium using a modified
perturbation formulation of a radiation transport equation where normalized measured
values are used to recover a relative difference in absorption and/or scattering
properties based on the normalized measured values with respect to a reference
medium. The modified perturbation formulation provides enhanced stability, reduces
the sensitivity of solution to variations between the target and reference media,
produces solutions having physical units and reduces the need for absolute detector
calibration. Moreover, the modified perturbation equation lends itself to the detection
and imaging of dynamic properties of the scattering medium.