Fig. 2.

Microscopic methylene blue stained ex vivo mouse colon and USAF bar target images viewed at $2\times$ (a) and (b) and $4\times$ (d) and (e). Mucosal crypt structure was resolved between the two sets of images, indicating a desired surface magnifying chromoendoscopy modality imaging resolution between $102\text{-}128\mathrm{lp}/\mathrm{mm}$. Parts (c) and (f) show enlarged views of boxed regions in parts (b) and (e), respectively.