Table 2.
Low-dose perfusion measurement and reference standard perfusion measurement accuracy and precision analysis
| Condition | Slope | Intercept | Pearson's r | Lin’s CCC | RMSE (mL/min/g) |
RMSD (mL/min/g) |
|---|---|---|---|---|---|---|
| STRESS + REST | ||||||
| LAD |
1.04 [0.92, 1.15] |
− 0.09 [− 0.29, 0.11] |
0.95 [0.91, 0.97] |
0.95 [0.90, 0.97] |
0.28 | 0.28 |
| LCx |
1.01 [0.87, 1.16] |
− 0.05 [− 0.33, 0.22] |
0.96 [0.90, 0.98] |
0.95 [0.90, 0.98] |
0.32 | 0.32 |
| RCA |
1.09 [0.89, 1.30] |
− 0.13 [− 0.45, 0.18] |
0.92 [0.82, 0.96] |
0.90 [0.79, 0.96] |
0.37 | 0.36 |
| ALL |
1.04 [0.96, 1.12] |
− 0.08 [− 0.22, 0.05] |
0.94 [0.92, 0.96] |
0.94 [0.91, 0.96] |
0.32 | 0.32 |
| STRESS | ||||||
| LAD |
1.06 [0.88, 1.25] |
− 0.14 [− 0.51, 0.23] |
0.92 [0.84, 0.97] |
0.91 [0.82, 0.96] |
0.31 | 0.31 |
| LCx |
0.98 [0.76, 1.20] |
0.04 [− 0.47, 0.55] |
0.92 [0.80, 0.97] |
0.92 [0.79, 0.97] |
0.36 | 0.36 |
| RCA |
1.13 [0.73, 1.54] |
− 0.20 [− 0.94, 0.54] |
0.83 [0.59, 0.93] |
0.79 [0.51, 0.92] |
0.41 | 0.40 |
| ALL |
1.04 [0.91, 1.16] |
− 0.07 [− 0.33, 0.19] |
0.90 [0.85, 0.94] |
0.89 [0.83, 0.94] |
0.36 | 0.36 |
| REST | ||||||
| LAD |
0.41 [− 0.17, 0.99] |
0.32 [− 0.06, 0.71] |
0.47 [− 0.18, 0.83] |
0.45 [− 0.21, 0.83] |
0.19 | 0.15 |
| LCx |
0.81 [− 0.28, 1.91] |
0.03 [− 0.67, 0.73] |
0.60 [− 0.18, 0.92] |
0.52 [− 0.29, 0.90] |
0.20 | 0.17 |
| RCA |
0.46 [− 0.48, 1.39] |
0.16 [− 0.32, 0.64] |
0.44 [− 0.39, 0.87] |
0.40 [− 0.42, 0.86] |
0.25 | 0.20 |
| ALL |
0.60 [0.24, 0.97] |
0.16 [− 0.07, 0.38] |
0.56 [0.23, 0.78] |
0.53 [0.19, 0.76] |
0.21 | 0.18 |
Brackets indicate 95% confidence intervals
LAD left anterior descending perfusion territory, LCx left circumflex perfusion territory, RCA right coronary artery perfusion territory, ALL all coronary perfusion territories combined, Lin’s CCC Lin’s concordance correlation coefficient, RMSE root-mean-square error, RMSD root-mean-square deviation