Table 1 Stone characteristics on soft tissue/bone window CT (mean ± SD)

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)