The Clinical Impact of Accurate Cystine Calculi Characterization Using Dual-Energy Computed Tomography

Figure 2

DECT scan with advanced postprocessing, which identified the stone material as cystine, in (a) left-side staghorn stone appears in this slice, and in (b), (c) two small right-side stones appear in these slices labeled small stone #1 and small stone #2, assigned a unique color (yellow). Histograms of the dual-energy ratio (DER) distribution showing mean ± SD = 1.25 ± 0.22 of staghorn stone (d), small stone #1 in (e) = 1.24 ± 0.36, and small stone #2 in (f) = 1.22 ± 0.34, which are in the range associated with cystine.

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