Table 1
DR Reject Rate and corresponding radiation dose according to body region.
| BODY REGION | REJECTED DR PER BODY REGION | DR ACQUIRED PER BODY REGION | DR REJECT RATE PER BODY REGION | CONVERSION FACTORS (MSV/GY.CM2) | REJECTED DR CUMULATIVE DAP (GY.CM2) | REJECTED DR CUMULATIVE ED (MSV) |
|---|---|---|---|---|---|---|
| Foot | 401 | 6,974 | 5.7% | 0.003 | 26.4 | 0.1 |
| Knee | 1,997 | 11,157 | 17.9% | 0.003 | 145.3 | 0.5 |
| Femur | 55 | 710 | 7.7% | 0.036 | 24.6 | 0.9 |
| Hips | 974 | 7,505 | 13.0% | 0.130 | 379.8 | 49.4 |
| Abdomen | 80 | 1,648 | 4.9% | 0.180 | 67.0 | 12.1 |
| Pelvis | 654 | 7,350 | 8.9% | 0.140 | 500.2 | 70.0 |
| Lumbar spine | 659 | 20,766 | 3.2% | 0.220 | 858.8 | 188.9 |
| Thoracic spine | 152 | 2,584 | 5.9% | 0.240 | 74.3 | 17.8 |
| Cervical spine | 290 | 6,436 | 4.5% | 0.190 | 25.0 | 4.8 |
| Shoulder | 811 | 15,303 | 5.3% | 0.064 | 131.5 | 8.4 |
| Chest | 2,832 | 26,844 | 10.5% | 0.160 | 152.6 | 24.4 |
| Total | 8,904 | 107,277 | 8.3% | 2,385.3 | 377.3 |
[i] Table 1 shows the number of rejected DR according to body region as well as the number of DR acquired per body region (including both accepted and rejected DR examinations). It also shows the conversion factors specific to each body region and the corresponding cumulative effective doses (ED).
Table 2
The identified reasons for DR image rejection.
| DR REJECT REASON | N(%) |
|---|---|
| Positioning | 5,431 (61%) |
| Anatomy cut-off | 1,888 (21%) |
| Clothing artefact | 712 (8%) |
| Under exposed | 356 (4%) |
| Poor inspiration | 338 (3.8%) |
| Over exposed | 162 (2%) |
| Software failure | 9 (0.11%) |
| Other failure | 8 (0.09%) |
| Total | 8,904 |
[i] Table 2 shows the list of reasons for DR rejection and their percentage of occurrence.
Table 3
CT Reject Rate and corresponding radiation dose according to body region.
| BODY REGION | REJECTED CT PER BODY REGION | CT ACQUIRED PER BODY REGION | CT REJECT RATE PER BODY REGION | CONVERSION FACTORS (MSV/MGY.CM) | REJECTED CT CUMULATIVE DLP (MGY.CM) | REJECTED CT CUMULATIVE ED (MSV) |
|---|---|---|---|---|---|---|
| HEAD | 241 | 4,514 | 5.3% | 0.0021 | 110,874.0 | 232.8 |
| NECK | 30 | 9,322 | 0.3% | 0.0059 | 14,439.8 | 85.2 |
| CHEST | 22 | 2,041 | 1.1% | 0.0140 | 3,389.0 | 47.4 |
| ABDOMEN PELVIS | 172 | 9,322 | 1.8% | 0.0150 | 51,077.2 | 766.2 |
| EXTREMITIES | 49 | 1,184 | 4.1% | 0.0110 | 9,050.3 | 135.8 |
| Total | 514 | 20,659 | 2.5% | 188,830.3 | 1,267.4 |
[i] Table 3 shows the number of rejected CT according to body region as well as the number of CT acquired per body region (including both accepted and rejected CT examinations). It also shows the conversion factors specific to each body region and the corresponding cumulative effective doses (ED).
Table 4
The identified reasons for CT image rejection.
| CT REJECT REASON | N(%) |
|---|---|
| Positioning | 225 (44%) |
| Anatomy cut-off | 148 (29%) |
| Patient movement | 46 (8,9%) |
| Inappropriate contrast phase | 36 (7%) |
| Metal Artefact | 29 (6%) |
| Poor Inspiration | 20 (4%) |
| Software failure | 5 (0.1%) |
| Other failure | 5 (0.1%) |
| Total | 514 |
[i] Table 4 shows the list of reasons for DR rejection and their percentage of occurrence.