Table 2.
Interobserver measurement variability
| Measurement | FBP | iDose4 | IMR | |
|---|---|---|---|---|
| Diameter | Interobserver variabilitya | −24.2, 10.0 | −24.1, 8.7 | −26.6, 13.4 |
| ρc | 0.98 | 0.97 | 0.98 | |
| Attenuation | Interobserver variabilitya | −10.9, 12.3 | −7.5, 6.8 | −5.2, 4.8 |
| ρc | 1.00 | 1.00 | 1.00 | |
| Noise | Interobserver variabilitya | −5.1, 4.1 | −1.5, 1.9 | −6.6, 5.3 |
| ρc | 1.00 | 1.00 | 0.98 | |
| CNR | Interobserver variabilitya | −16.8, 11.4 | −7.5, 7.4 | −5.4, 7.3 |
| ρc | 1.00 | 1.00 | 0.98 | |
| SNR | Interobserver variabilitya | −13.5, 12.1 | −14.1, 10.5 | −12.8, 16.3 |
| ρc | 0.99 | 0.99 | 0.92 |
a
The results of Bland-Altman analyses are displayed in 95% confidence interval of the relative differences in percentage.
ρc, concordance correlation coefficient; FBP, filtered back projection; IMR, iterative model reconstruction; CNR, contrast-to-noise ratio; SNR, signal-to-noise ratio.