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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Urolithiasis. 2020 Oct 7;49(2):123–135. doi: 10.1007/s00240-020-01216-4

Figure 4. Infrared microscopy of stone polished down to reveal Randall’s plaque (RP) and stone overgrowth region.

Figure 4.

A: Micro CT just below planar surface of polished stone; stone measured only 800 μm from lowest part of Randall’s plaque (left) to top of stone (right). B: Photographic montage of polished surface of stone taken on infrared microscope. C: False color image collected using reflectance mode, demonstrating homogeneity of infrared spectra of Randall’s plaque region (showing the mineral apatite) and the stone overgrowth region (showing the mineral calcium oxalate monohydrate, COM). Dotted line indicates field for D. D: False color image collected using attenuated total reflection (ATR) mode, showing neck region of overgrowth onto RP. Note interleaving of apatite and COM in region indicated by bracket.