Table 1.
Qualitative score of peristalsis-related streak artifact severity on the liver of Reader A and B in conventional 120 kVp images, 40 keV monoenergetic images, 200 keV monoenergetic images, virtual non-contrast (VNC) images, and iodine images.
| Reader A | |||||
|---|---|---|---|---|---|
| Image Reconstructions | Score | ||||
| 1 | 2 | 3 | 4 | 5 | |
| 120 kVp | 0/51 (0%) | 22/51 (43%) | 18/51 (35%) | 9/51 (18%) | 2/51 (4%) |
| 40 keV | 3/51 (6%) | 19/51 (37%) | 17/51 (33%) | 5/51 (10%) | 7/51 (14%) |
| 200 keV | 0/51 (0%) | 23/51 (45%) | 15/51 (29%) | 11/51 (22%) | 2/51 (4%) |
| VNC | 1/51 (2%) | 22/51 (43%) | 14/51 (27%) | 12/51 (24%) | 2/51 (4%) |
| iodine | 33/51 (65%) | 14/51 (27%) | 4/51 (8%) | 0/51 (0%) | 0/51 (0%) |
| Reader B | |||||
| Image Reconstructions | Score | ||||
| 1 | 2 | 3 | 4 | 5 | |
| 120 kVp | 0/51 (0%) | 9/51 (18%) | 19/51 (37%) | 11/51 (22%) | 12/51 (24%) |
| 40 keV | 10/51 (20%) | 11/51 (22%) | 16/51 (31%) | 4/51 (8%) | 10/51 (20%) |
| 200 keV | 1/51 (2%) | 4/51 (8%) | 16/51 (31%) | 12/51 (24%) | 18/51 (35%) |
| VNC | 1/51 (2%) | 5/51 (10%) | 16/51 (31%) | 12/51 (24%) | 17/51 (33%) |
| iodine | 42/51 (82%) | 4/51 (8%) | 2/51 (4%) | 3/51 (6%) | 0/51 (0%) |
Score 1 = Absence of streak artifact on the liver; Score 2 = Visible streak artifact with no effect on diagnosis on the liver; Score 3 = Moderate streak artifact that may decrease confidence in diagnosing a 0.5 to 0.9 cm liver lesion; Score 4 = Distinct streak artifact that prevents the diagnosis of a 0.5 to 0.9 cm liver lesion and may decrease confidence in diagnosing a ≥1.0 cm liver lesion; Score 5 = Severe streak artifact that prevents the diagnosis of a ≥1.0 cm liver lesion.