Table 2.
Fluoroscope loop technique and Shewhart Control Chart Data from all five IR rooms using the CD phantom.
| IR‐15 | IR‐16 | IR‐17 | IR‐18 | IR‐19 | |
|---|---|---|---|---|---|
| N days | 160 | 157 | 154 | 158 | 158 |
| Mean kVp | 65.7 | 66.0 | 67.1 | 65.9 | 71.3 |
| kVp SD | 1.0 | 0 | 1.5 | 0.28 | 0 |
| Mean mA | 227.3 | 144.9 | 175.2 | 205.9 | 97.9 |
| mA SD | 43.2 | 1.1 | 58.3 | 6.4 | 0.4 |
| Mean SNR | 49.8 | 50.9 | 48.1 | 23.6 | 61.2 |
| SD SNR | 1.21 | 0.66 | 1.08 | 0.92 | 1.05 |
| CV SNR | 2.4% | 1.3% | 2.2% | 3.9% | 1.7% |
| # instances above UCL | 1 | 0 | 0 | 0 | 0 |
| # instances below LCL | 0 | 1 | 0 | 3 | 1 |
Abbreviations: SNR, signal to noise ratio; CNR, contrast to noise ratio; CV, coefficient of variation; UCL, upper control limit.