Table 5 Variations in radiographer responses in identifying different types of MR image-quality errors
Error Category | Group Control N = 16 Experimental N = 19 | Number of images | Total Number of responses | Number (%) correct (pre-test) | Number (%) Dis-improved | Number (%) incorrect (pre-test) | Number (%) improved |
|---|---|---|---|---|---|---|---|
SNR (Signal to noise ratio) | Control | 4 | 64 | 40 (62.5%) | 7 (16.3%) | 24 (37.5%) | 6 (25%) |
Experimental | 76 | 44 (57.9%) | 15 (34.1%) | 32 (42.1%) | 18 (56.3%) | ||
CNR (Contrast to noise ratio) | Control | 6 | 96 | 67 (69.8%) | 10 (15.9%) | 29 (30.2%) | 7 (24.1%) |
Experimental | 114 | 65 (57.02%) | 0 (0%) | 49 (43%) | 40 (81.6%) | ||
SR (Spatial resolution) | Control | 2 | 32 | 11 (34.4%) | 3 (27.2%) | 21 (65.6%) | 4 (19%) |
Experimental | 38 | 17 (44.7%) | 0 (0%) | 21 (55.3%) | 21 (100%) | ||
Artefact | Control | 7 | 112 | 51 (45.5%) | 4 (7.8%) | 61 (54.5%) | 4 (6.6%) |
Experimental | 133 | 74 (55.6%) | 3 (4.1%) | 59 (44.4%) | 37 (62.7%) | ||
No Technical Error Evident | Control | 5 | 80 | 62 (77.5%) | 7 (11.3%) | 18 (22.5%) | 6 (33.3%) |
Experimental | 95 | 73 (76.9%) | 7 (9.6%) | 22 (23.2%) | 19 (86.4%) | ||
SNR and CNR | Control | 1 | 16 | 10 (62.5%) | 2 (20%) | 6 (37.5%) | 0 (0%) |
Experimental | 19 | 15 (78.9%) | 0 (0%) | 4 (21.1%) | 4 (100%) |