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Table 2
Participants response regarding different aspects.
| Questions | Patient parameters | False | True |
|---|---|---|---|
| Routine CT scanning parameters (kVp, mAs, slice thickness, pitch, reconstruction algorithms, etc.) should be changed according to which of the following: | Patient size | 4 (1.2%) | 324 (98.8%) |
| Anatomical region | 36 (11%) | 292 (89%) | |
| Study indication | 68 (20.7%) | 260 (79.3%) | |
| Patient age | 56 (17.1%) | 272 (82.9%) | |
| Regarding Automated Tube Current Modulation (ATCM) | ATCM has been shown to decrease patient dose on average | 32 (9.8%) | 296 (90.2%) |
| ATCM can increase the patient dose in the pelvic region | 116 (35.4%) | 212 (64.6%) | |
| ATCM should not be used in the presence of metallic implants | 184 (56.1%) | 144 (43.9%) | |
| ATCM is affected by centering of the patient within the gantry | 52 (15.9%) | 276 (84.1%) | |
| Regarding the noise setting (Noise index: GE/ standard deviation: Toshiba/ Effective mAs: Siemens+ Philips) | The non-contrast phase of an abdomen scan required the same noise setting (i.e., mAs setting) as the contrast phase | 228 (69.5%) | 100 (30.5%) |
| Readers can tolerate less noise with obese patients | 172 (52.4%) | 156 (47.6%) | |
| Readers can tolerate more noise with paediatrics | 108 (32.9% | 220 (67.1%) | |
| The noise index should be changed when changes in patient size are extreme | 24 (7.3%) | 304 (92.7%) | |
| Reducing the kVp from 120 to 100 kVp for angiographic CT procedures (all other parameters being kept constant | Reduces the radiation dose | 28 (8.5%) | 300 (91.5%) |
| Reduces the image contrast | 124 (37.8%) | 204 (62.2%) | |
| Increases the image noise | 104 (31.7%) | 224 (68.3%) | |
| Increases the vessel enhancement | 112 (34.1%) | 216 (65.9%) | |
| Regarding the ’Pitch’ (table movement per rotation/ total nominal beam width) | Pitch may impact on image quality and patient dose | 20 (6.1%) | 308 (93.9%) |
| Higher table speeds result in an increase in slice sensitivity profile and thus effective slice thickness, reducing the z-axis resolution | 72 (22%) | 256 (78%) | |
| Spiral artefacts are reduced at lower pitch settings | 80 (24.4%) | 248 (75.6%) | |
| For single helical CT, the higher the pitch, the lower the dose | 68 (20.7%) | 260 (79.3%) | |
| Regarding slice thickness (selected beam width/ collimation) | Increasing the slice thickness increases the spatial resolution | 184 (56.1%) | 144 (43.9%) |
| Increasing the slice thickness decreases the dose | 72 (22.0%) | 256 (78..0%) | |
| Decreasing the slice thickness reduces "partial volume" artefacts | 68 (20.7%) | 260 (79.3%) | |
| Decreasing the slice thickness will increase the scan time | 176 (53.7%) | 152 (46.3%) |
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