Quantitative assessment of metal artifacts before and after reduction
| Objects | HU Range | P Value | Noise | P Value | ||||
|---|---|---|---|---|---|---|---|---|
| Before | After | % Change | Before | After | % Change | |||
| ROI0 (n = 28) | 247.2 ± 37.5 | 247.3 ± 37.3 | 0.04 | NS | 36.3 ± 4.8 | 36.2 ± 4.7 | 0.2 | NS |
| Coiling ± stenting (n = 20) | 2005.6 ± 804.0 | 282.6 ± 55.8 | 85.9 | <.001 | 251.7 ± 94.4 | 42.9 ± 10.3 | 82.9 | <.001 |
| <25 cm (n = 6) | 1613.7 ± 709.7 | 296 ± 44.7 | 81.7 | .006 | 198.4 ± 83.8 | 42.8 ± 7.3 | 78.4 | .007 |
| 25–100 cm (n = 7) | 1954.9 ± 634.2 | 257.6 ± 23.5 | 86.8 | <.001 | 238.6 ± 49.3 | 38.9 ± 5.6 | 83.7 | <.001 |
| >100 cm (n = 7) | 2392.3 ± 945.6 | 296 ± 80.7 | 87.6 | .001 | 310.3 ± 113.5 | 46.9 ± 15.0 | 84.9 | .001 |
| Liquid embolizer (n = 6) | 1377.3 ± 646.6 | 428.5 ± 259.0 | 68.9 | .019 | 206.0 ± 86.3 | 56.9 ± 21.6 | 72.3 | .007 |
| Shunt (n = 2) | 1226.5 ± 259.5 | 368.0 ± 76.4 | 70.9 | NS | 109.8 ± 2.6 | 44.0 ± 0.7 | 60 | .013 |
| Overall (ROI1) (n = 28) | 1815.3 ± 793.7 | 319.9 ± 136.6 | 82.3 | <.001 | 231.7 ± 95.9 | 45.9 ± 14.0 | 80.2 | <.001 |
Note:—NS indicates no significance.