Quantification of Biventricular Myocardial Strain Using CMR Feature Tracking: Reproducibility in Small Animals
Table 2
Intraobserver, interobserver, and interstudy reproducibilities for global LV and RV strain assessment.
Parameter
S1 (%)
S2 (%)
Mean difference
Limits of agreement
ICC (95% CI)
Coefficient of variations
Intraobserver
LLSLAX
-0.19
-1.58 to 1.21
0.99 (0.96 to 1.00)
3.36%
LCSSAX
-0.05
-2.56 to 2.46
0.94 (0.81 to 0.98)
4.10%
LRSSAX
1.43
-4.50 to 7.36
0.84 (0.54 to 0.95)
7.06%
RLSLAX
-0.58
-3.17 to 2.02
0.97 (0.89 to 0.99)
3.92%
RCSSAX
-1.64
-4.06 to 0.79
0.78 (0.02 to 0.95)
7.22%
Interobserver
LLSLAX
-0.20
-1.98 to 1.58
0.98 (0.93 to 0.99)
3.51%
LCSSAX
0.91
-2.56 to 4.38
0.86 (0.58 to 0.96)
6.74%
LRSSAX
0.37
-7.61 to 8.36
0.76 (0.36 to 0.93)
8.58%
RLSLAX
-2.4
-7.57 to 2.79
0.84 (0.30 to 0.96)
11.41%
RCSSAX
-1.68
-6.09 to 2.73
0.65 (0.11 to 0.89)
9.98%
Interstudy
LLSLAX
-0.44
-4.26 to 3.37
0.90 (0.71 to 0.97)
8.81%
LCSSAX
-0.33
-6.11 to 5.44
0.77 (0.38 to 0.93)
11.11%
LRSSAX
-0.57
-15.07 to 13.92
0.50 (0.10 to 0.83)
18.06%
RLSLAX
-2.14
-10.09 to 5.81
0.70 (0.26 to 0.90)
11.99%
RCSSAX
-1.88
-8.29 to 4.52
0.36 (0.14 to 0.74)
12.88%
Results are shown as the . S1 and S2 refer to the two readings among intraobserver, interobserver, and interstudy reproducibilities. LLSLAX: left ventricular long-axis longitudinal strain; LRSLAX: left ventricular long-axis radial strain; LCSSAX: left ventricular short-axis circumferential strain; LRSSAX: left ventricular short-axis radial strain; RLSLAX: right ventricular long-axis longitudinal strain; RCSSAX: right ventricular short-axis circumferential strain; ICC: intraclass correlation coefficient; CI: confidence interval.
