Protocol | Field | Lobe | n |
---|---|---|---|
P01 | 1.5T | Left lobe | 480 |
P01 | 1.5T | Right lobe | 384 |
P01 | 3.0T | Left lobe | 470 |
P01 | 3.0T | Right lobe | 376 |
P02 | 1.5T | Left lobe | 480 |
P02 | 1.5T | Right lobe | 384 |
P02 | 3.0T | Left lobe | 460 |
P02 | 3.0T | Right lobe | 368 |
P04 | 1.5T | Left lobe | 475 |
P04 | 1.5T | Right lobe | 380 |
P04 | 3.0T | Left lobe | 430 |
P04 | 3.0T | Right lobe | 344 |
P08 | 1.5T | Left lobe | 455 |
P08 | 1.5T | Right lobe | 364 |
P08 | 3.0T | Left lobe | 430 |
P08 | 3.0T | Right lobe | 344 |
Multicenter Test-Retest and Acquisition Protocol Reproducibility of Liver Iron Quantification
Statistical analysis
A placeholder for description of methods.
Repeatability analysis
The number of pairs for test-retest repeatability analysis by protocol, field strength, and lobe is listed below.
The test-retest bias, coefficient of repeatability (CR), intra-class correlation (ICC) coefficient and 95% confidence interval (CI) are summarized by protocol, field strength, and lobe in Table 1 below.
Protocol | Field | Lobe | Bias | CR | ICC (95% CI) | p-value |
---|---|---|---|---|---|---|
P01 | 1.5T | Left | 2.8 | 74.4 | 0.989 (0.986, 0.99) | < 0.001 |
P01 | 1.5T | Right | -1.1 | 52.6 | 0.995 (0.994, 0.996) | < 0.001 |
P01 | 3.0T | Left | -9.4 | 247.9 | 0.968 (0.962, 0.974) | < 0.001 |
P01 | 3.0T | Right | -5.9 | 131.2 | 0.992 (0.99, 0.993) | < 0.001 |
P02 | 1.5T | Left | 0.4 | 108.5 | 0.97 (0.964, 0.975) | < 0.001 |
P02 | 1.5T | Right | 0.1 | 72.1 | 0.989 (0.987, 0.991) | < 0.001 |
P02 | 3.0T | Left | 1.9 | 266.9 | 0.959 (0.951, 0.966) | < 0.001 |
P02 | 3.0T | Right | -6.8 | 119.0 | 0.992 (0.991, 0.994) | < 0.001 |
P04 | 1.5T | Left | -2.4 | 107.2 | 0.968 (0.961, 0.973) | < 0.001 |
P04 | 1.5T | Right | 0.8 | 70.3 | 0.989 (0.987, 0.991) | < 0.001 |
P04 | 3.0T | Left | 14.6 | 281.8 | 0.887 (0.865, 0.905) | < 0.001 |
P04 | 3.0T | Right | 9.3 | 208.9 | 0.964 (0.956, 0.971) | < 0.001 |
P08 | 1.5T | Left | -1.7 | 123.5 | 0.948 (0.938, 0.957) | < 0.001 |
P08 | 1.5T | Right | 0.7 | 98.7 | 0.974 (0.968, 0.979) | < 0.001 |
P08 | 3.0T | Left | 5.0 | 235.3 | 0.854 (0.826, 0.878) | < 0.001 |
P08 | 3.0T | Right | 10.7 | 312.2 | 0.869 (0.84, 0.892) | < 0.001 |
Bland-Altman plots of test-retest repeatability by protocol and lobe for 1.5T and 3.0T are shown in Figure 1 and Figure 2, respectively.