Ultrasound B-scan versus anterior segment optical coherence tomography: image features
| Features | Ultrasound B scan N=126 Number (%) | AS-OCT N=126 Number (%) | ||||
|---|---|---|---|---|---|---|
| Acoustic features | ||||||
| Hollow | 38 (30.2) | 30 (23.8) | ||||
| Solid | 51 (40.5) | 86 (68.3) | ||||
| Lesion undetectable | 37 (29.4) | 10 (7.9) | ||||
| Internal pattern | ||||||
| Heterogeneous | 39 (31) | 29 (23.1) | ||||
| Homogeneous | 50 (39.7) | 87 (69) | ||||
| Lesion undetectable | 37 (29.4) | 10 (7.9) | ||||
| Visibility | Good | Fair | Undetectable | Good | Fair | Undetectable |
| Anterior | 63 (50) | 25 (19.8) | 38 (30.2) | 112 (88.9) | 10 (7.9) | 4 (3.2) |
| Medial | 57 (45.2) | 29 (23) | 40 (31.7) | 59 (46.8) | 44 (34.9) | 23 (18.3) |
| Lateral | 51 (40.5) | 34 (27) | 41 (32.5) | 60 (47.6) | 43 (34.1) | 23 (18.3) |
| Posterior | 54 (42.9) | 33 (26.2) | 39 (31) | 16 (12.7) | 57 (45.2) | 53 (42.1) |
| All margins seen | ||||||
| Yes | 81 (64.3) | 59 (46.8) | ||||
| No | 45 (35.7) | 67 (53.2) | ||||
| Posterior shadowing | ||||||
| None | 121 (96) | 43 (34.1) | ||||
| Yes—trace | 2 (1.6) | 12 (9.5) | ||||
| Yes—mild | 1 (0.8) | 22 (17.5) | ||||
| Yes—moderate | 0 | 22 (17.5) | ||||
| Yes—severe | 2 (1.6) | 27 (21.4) | ||||
| Elevation (mm) | ||||||
| Mean (SD, range) | 1.8 (±1.4, 0.3 to 5.8) | 1.0 (±1.1, 0.1 to 6.0) | ||||
| Longitudinal base (mm) | ||||||
| Mean (SD, range) | 2.6 (±1.5, 1.0 to 7.8) | 2.8 (±1.6, 0.8 to 8.1) | ||||
| Transverse base (mm) | ||||||
| Mean (SD, range) | 2.9 (±0.8, 0.8 to 12.8) | 2.9 (±1.6, 0.7 to 7.6) | ||||
AS-OCT, anterior segment optical coherence tomography.