Table 3.
Shows the results from CNR/SNR data for four planes of two biplane fluoroscopes over a 4 month period.
| Neuro Lab‐1 | Neuro Lab‐2 | |||||||
|---|---|---|---|---|---|---|---|---|
| AP | LAT | AP | LAT | |||||
| CNR | SNR | CNR | SNR | CNR | SNR | CNR | SNR | |
| n | 81 | 81 | 82 | 82 | 77 | 77 | 81 | 81 |
| Mean | 3.042 | 56.54 | 3.24 | 58.74 | 3.24 | 58.74 | 2.646 | 50.37 |
| SD | 0.356 | 2.047 | 0.252 | 1.135 | 0.252 | 1.135 | 0.234 | 1.366 |
| % Error (CV) | 11.7% | 3.6% | 7.8% | 1.9% | 7.8% | 1.9% | 8.8% | 2.7% |
| # Above UCL | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| # Below LCL | 1 | 1 | 1 | 2 | 1 | 2 | 1 | 2 |
Abbreviations: SNR, signal to noise ratio; CNR, contrast to noise ratio; CV, coefficient of variation; UCL, upper control limit.