Table 1.
Stone characteristics on soft tissue/bone window CT (mean ± SD)
| Soft tissue (Bone) windows | p | Calcium | Uric acid | Cystine | Struvite | |
|---|---|---|---|---|---|---|
| D1 (mm) | 19 ± 7 (17 ± 7) | 0.34 | 18 ± 6 (16 ± 6) | 19 ± 8 (18 ± 8) | 18 ± 8 (17 ± 8) | 24 ± 6 (23 ± 6) |
| Area (mm2) | 188 ± 137 (164 ± 126) | 0.26 | 174 ± 122 (148 ± 111) | 190 ± 150 (168 ± 137) | 204 ± 168 (185 ± 160) | 275 ± 152 (250 ± 143) |
| Volume (mm3) | 2914 ± 3481 (2438 ± 3084) | 0.37 | 2495 ± 3072 (2024 ± 2669) | 3097 ± 4034 (2612 ± 3563) | 4178 ± 4228 (3714 ± 3964) | 3792 ± 2964 (3318 ± 2637) |
| HUC | 942 ± 378 (986 ± 389) | 0.48 | 1190 ± 251 (1240 ± 259) | 606 ± 276 (638 ± 271) | 683 ± 75 (708 ± 66) | 1010 ± 394 (1090 ± 439) |
| HUP | 314 ± 55 (395 ± 93) | <0.001 | 330 ± 59 (426 ± 85) a | 287 ± 41 (358 ± 98) a | 300 ± 45 (358 ± 49) | 340 ± 42 (390 ± 96) |
| HUM | 687 ± 265 (761 ± 306) | 0.11 | 835 ± 233 (941 ± 270) | 500 ± 203 (531 ± 216) | 542 ± 86 (608 ± 86) | 650 ± 235 (700 ± 255) |
| ∆HU | 628 ± 356 (590 ± 347) | 0.5 | 860 ± 234 (814 ± 245) | 319 ± 266 (280 ± 216) | 383 ± 75 (350 ± 45) | 670 ± 411 (700 ± 434) |
| HUD | 41 ± 19 (50 ± 26) | 0.01 | 51 ± 16 (63 ± 22) a | 31 ± 18 (36 ± 22) | 35 ± 14 (43 ± 21) | 28 ± 12 (33 ± 16) |
a Significant difference (p ≤ 0.01) between HU values at soft tissue versus bone windows
Legend: D1 = stone’s largest diameter at axial plane; HUC = HU at the center; HUP = HU value at periphery; HUM = HU mean value; ∆HU = HUC-HUP; HUD = ratio between HUM and D1