Quantification of Biventricular Myocardial Strain Using CMR Feature Tracking: Reproducibility in Small Animals
Table 3
Intraobserver, interobserver, and interstudy reproducibilities for segmental LV and RV strain assessment.
Parameter
Mean difference
Limits of agreement
ICC (95% CI)
Coefficient of variations
Intraobserver
LLSLAX
-0.16
-9.16 to 8.83
0.94 (0.92 to 0.96)
7.41%
LCSSAX
-0.21
-5.98 to 5.57
0.95 (0.94 to 0.96)
14.5%
LRSSAX
1.08
-9.46 to 11.62
0.95 (0.93 to 0.96)
7.6%
RLSLAX
-0.01
-11.96 to 11.99
0.94 (0.91 to 0.96)
5.79%
RCSSAX
-1.51
-9.42 to 6.39
0.78 (0.67 to 0.85)
10.11%
Interobserver
LLSLAX
-0.19
-10.06 to 9.68
0.93 (0.90 to 0.96)
19.81%
LCSSAX
1.11
-16.42 to 18.64
0.54 (0.43 to 0.63)
37.4%
LRSSAX
-2.03
-28.66 to 24.60
0.64 (0.55 to 0.72)
42.6%
RLSLAX
-1.74
-13.61 to 10.14
0.95 (0.92 to 0.97)
19.5%
RCSSAX
-1.13
-14.57 to 12.31
0.47 (0.27 to 0.63)
18.35%
Interstudy
LLSLAX
-0.05
-16.04 to 15.94
0.80 (0.71 to 0.87)
21.74%
LCSSAX
-0.52
-8.79 to 7.76
0.91 (0.88 to 0.93)
4.4%
LRSSAX
0.18
-18.44 to 18.79
0.84 (0.79 to 0.88)
58.3%
RLSLAX
-0.79
-21.56 to 19.98
0.80 (0.69 to 0.87)
6.5%
RCSSAX
-2.58
-14.35 to 9.19
0.54 (0.36 to 0.69)
15.29%
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.
