Table 1.
Electrical power consumed, and time spent in each operating mode, with calculated attributional (ALCA) and consequential (CLCA) power use.
| Total time spent - hrs | Total scans | Average scans per week | Average time (min) per scan (95% CI) | Total power kWh | Average power Wh/min |
ALCA power Wh/min |
CLCA power Wh/min |
|
|---|---|---|---|---|---|---|---|---|
| CT Active | 28·2 | 399 | 200 | 8·4±0·2 | 278 | 164 | 939 | 64 |
| CT Active standby | 145·6 | 927·5 | 106 | |||||
| CT Passive standby | 162 | 280·7 | 29 | |||||
| MRI Active | 110·5 | 245 | 122 | 26·7±2.5 | 1749.3 | 265 | 605 | 91 |
| MRI Active standby | 63·4 | 660.1 | 174 | |||||
| MRI passive standby | 163·1 | 1473·6 | 151 | |||||
| US Active | 48·4 | 146 | 69 | 19·9±2.1 | 25·5 | 9 | 23 | 0.85 |
| US Active standby | 69·2 | 33·4 | 8 | |||||
| US passive standby | 237·6 | 5·2 | 0.4 | |||||
| Total time spent - hrs | Total scans |
Average time (min) per CXR (95% CI) |
Total power - kWh |
Average power Wh/CXR |
ALCA power Wh/CXR |
CLCA power Wh/CXR | ||
| CXR Active | 1·2 | 47 | 24 | 1·5±0·3 | 0·7 | 10 | 171 | 5 |
| Total X-ray Standby | 321·3 | 114 | 6 | |||||