Figure 3.

Unstained breast tissue characterized by typical ductal hyperplasia showing mammary ducts in longitudinal section. (a) BF image taken with the inverted microscope (20×/0.4 NA objective); (b) phase map attained using the wDPM system, where color bar represents the OPL through the specimens, in nm (pixels are saturated at 78 nm in order to enhance details in the ROI); the arrows indicate the collagen stroma, an endothelial cell, and RBCs. Histograms of the collected signal (gray values) on the collagen stroma area are represented for images taken with the inverted microscope (c) and wDPM setup (d), respectively.