PMC4673321_01
Conventional CT (a) and DECT (b) images showing a large staghorn stone and a small stone in the left and right kidneys, respectively. The standard DECT postprocessing algorithm colors all non-uric-acid stones blue. A follow-up scan confirmed the location of the passed stone.
CRIRA2015-801021.001.jpg
PMC4673321_01_CRIRA2015-801021.001.jpg
fig1
All stones were characterized as non-UA (color-coded in blue), as shown in Figure 1.
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.
CRIRA2015-801021.002.jpg
PMC4673321_01_CRIRA2015-801021.002.jpg
fig2
The DER measurements were calculated for the large left kidney stone (DER (mean +- SD) = 1.25 +- 0.22), and the right-side stones (stone #1 DER = 1.24 +- 0.36 and stone #2 DER = 1.22 +- 0.34) (Figure 2).