Fig. 3.

Porcine lymph nodes implanted with GFP-labeled human breast cancer cell (MDA-MB-231) spheroids. Columns from left to right: (a), (h) false-colored fluorescence overlaid onto transmittance images from a single tomographic view (scale bar 1 mm); (b), (e), (i), (l) angle-restricted fluorescence OPT FBP reconstructed virtual sections at the height of detected cells indicated by yellow and red dashed lines (scale bar 1 mm); (c), (f), (j), (m) Pearl images (fluorescence overlaid on to white light) of lymph node sections sliced at the same heights (scale bar 1 mm); (d), (g), (k), (n) fluorescent microscope images of the regions outlined in dashed boxes (scale bar $200\mu \mathrm{m}$). Top and bottom rows for each node correspond to top (yellow dashed lines) and bottom (red dashed lines) detected micrometastases, respectively.