Table 5.
Distribution of Artifacts among Image Types (N [%])
| Scan type | QS < 4 | Artifact types among images with QS ≥ 4 | Artifact frequency among images with QS ≥ 4 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||||
| Shadow | Eye movement | Defocus | Segmentation error | Decentration | Blink | Z offset | No artifacts | 1 artifact | > 1 artifact | |||
|
| ||||||||||||
| MC | UnC | |||||||||||
| Optic Nerve Head | ||||||||||||
|
| ||||||||||||
| Non-HD | 113 (8.2) | 86 (6.8) | 31 (2.5) | 130 (10.3) | 99 (7.8) | 116 (9.2) | 65 (5.1) | 14 (1.1) | 30 (2.4) | 983 (77.7) | 157 (12.4) | 126 (10.0) |
| HD | 63 (8.3) | 41 (5.9) | 56 (8.0) | 83 (11.9) | 49 (7.0) | 34 (4.9) | 14 (2.0) | 16 (2.3) | 16 (2.3) | 554 (79.4) | 72 (10.3) | 72 (10.3) |
| Macula | ||||||||||||
| 3×3 mm 2 non-HD | 288 (19.8) | 41 (3.5) | 243 (20.8) | 125 (10.7) | 52 (4.5) | 45 (3.9) | 62 (5.3) | 16 (1.4) | 5 (0.4) | 810 (69.3) | 221 (18.9) | 138 (11.8) |
| 6×6 mm 2 non-HD | 124 (13.8) | 49 (6.4) | 81 (10.5) | 66 (8.6) | 85 (11.0) | 26 (3.4) | 26 (3.4) | 4 (0.5) | 9 (1.2) | 608 (78.8) | 94 (12.2) | 70 (9.1) |
| 6×6 mm 2 HD | 134 (17.4) | 28 (4.4) | 71 (11.2) | 30 (4.7) | 62 (9.8) | 22 (3.5) | 17 (2.7) | 5 (0.8) | 5 (0.8) | 523 (82.2) | 72 (11.3) | 41 (6.5) |
| Overall | 722 (13.7) | 245 (5.4) | 482 (10.6) | 434 (9.6) | 347 (7.6) | 243 (5.4) | 184 (4.1) | 55 (1.2) | 65 (1.4) | 3478 (76.6) | 616 (13.6) | 447 (9.8) |
N: number, QS: quality score, MC: manually corrected segmentation error, UnC: uncorrected segmentation error, HD: high density.