Table 1
From: Are cardiac R2* values dependent on the image analysis approach employed?
| Â | Paired t-test | Regression Analysis | Bland Altman | CoV (%) | |||||
|---|---|---|---|---|---|---|---|---|---|
|  | Mean Values (Hz) | P | Slope | P for Slope ≠1 | Intercept (Hz) | R-squared | Mean diff (Hz) | Limits (Hz) |  |
a) First single-center cohort: black blood images (N=42) | |||||||||
R2* Iron-mean vs R2* CMRTools | 48.5±54.7 vs 48.2±53.1 | 0.945 | 1.031±0.005 | <0.0001 | 1.176±0.379 | 0.999 | 0.3 | 4.4 to 5.1 | 3.53 |
R2* Iron-median vs R2* CMRTools | 48.9±55.0 vs 48.2±53.1 | 0.258 | 1.036±0.007 | <0.0001 | -1.007±0.473 | 0.998 | 0.7 | - 5.0 to 6.5 | 4.37 |
R2* Iron-ROI_based vs R2* CMRTools | 48.9±52.7 vs 48.2±53.1 | 0.063 | 0.993±0.007 | 0.336 | 1.058± 0.512 | 0.998 | 0.7 | -4.1 to 5.5 | 3.66 |
b) Second single-center cohort: bright blood images (N=70) | |||||||||
R2* Iron-mean vs R2* CMRTools | 47.6±37.9 vs 47.2±36.9 | 0.088 | 1.025±0.005 | <0.0001 | -0.741±0.300 | 0.998 | 0.4 | -3.1 to 3.9 | 2.70 |
R2* Iron-median vs R2* CMRTools | 47.7±38.2 vs 47.2±36.9 | 0.085 | 1.035±0.006 | <0.0001 | -1.190±0.373 | 0.998 | 0.4 | -4.0 to 4.9 | 3.45 |
R2* Iron-ROI_based vs R2* CMRTools | 47.5±37.4 vs 47.2±36.9 | 0.050 | 1.013±0.004 | 0.002 | -0.245±0.247 | 0.999 | 0.4 | -2.3 to 3.0 | 2.06 |
c) Multi-center cohort (N=62) | |||||||||
R2* Iron-mean vs R2* CMRTools | 43.5±22.6 vs 43.8±22.7 | 0.250 | 0.989±0.008 | 0.148 | 0.108±0.372 | 0.997 | -0.4 | -3.0 to 2.3 | 2.25 |
R2* Iron-median vs R2* CMRTools | 43.7±22.4 vs 43.8±22.7 | 0.989 | 0.982±0.007 | 0.015 | 0.705±0.359 | 0.997 | -0.1 | -2.7 to 2.6 | 2.25 |
R2* Iron-ROI_based vs R2* CMRTools | 44.0±22.5 vs 43.8±22.7 | 0.207 | 0.989±0.007 | 0.131 | 0.681±0.352 | 0.997 | 0.2 | -2.3 to 2.7 | 2.07 |