Table 4.
PMOD vs FlowQuant concordance correlation coefficients
| n | Pearson’s ρ [95% CI] | ρc [95% CI] | C b | Reduced major axis PMOD = f (FQ) | |
|---|---|---|---|---|---|
| Global left ventricle | |||||
| Rest MBF (mL/min/g) | 48 | 0.95 [0.91–0.97] | 0.93 [0.89–0.97] | 0.98 | y = 0.99x − 0.06 |
| Stress MBF (mL/min/g) | 48 | 0.93 [0.88–0.96] | 0.91 [0.86–0.95] | 0.98 | y = 1.18x − 0.29 |
| Stress + Rest MBF (mL/min/g) | 96 | 0.97 [0.95–0.98] | 0.96 [0.94–0.97] | 0.99 | y = 1.15x − 0.22 |
| MFR (unitless ratio) | 48 | 0.83 [0.72–0.90] | 0.76 [0.66–0.87] | 0.92 | y = 1.22x − 0.20 |
| 17-Segment level | |||||
| Rest MBF (mL/min/g) | 816 | 0.81 [0.78–0.83] | 0.79 [0.76–0.81] | 0.97 | y = 1.00x − 0.10 |
| Stress MBF (mL/min/g) | 816 | 0.84 [0.82–0.86] | 0.83 [0.81–0.85] | 0.98 | y = 1.23x − 0.49 |
| Stress + Rest MBF (mL/min/g) | 1632 | 0.90 [0.90–0.91] | 0.90 [0.89–0.90] | 0.99 | y = 1.15x − 0.28 |
| MFR (unitless ratio) | 816 | 0.73 [0.70–0.76] | 0.69 [0.66–0.73] | 0.95 | y = 1.25x − 0.33 |
ρ, Pearson’s correlation (precision); ρ c, Lin’s concordance correlation; C b, ρ c/ρ = bias correction factor (trueness); LV, left ventricle; MBF, myocardial blood flow; MFR, myocardial flow reserve