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Fig. 1.
Schematics of trajectories of SS and MS photons with different focus depths; i.e., different defocus amounts. No matter the focal position, the SS photon is scattered only once and hence has the same path length. This results in the consistent phase of the SS signal after computational refocusing. Meanwhile, the trajectories of MS photons are scrambled by changes in the focal position. Hence, the phase of the MS signal is randomized even after the computational refocusing.
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Full text @ Biomed. Opt. Express