Table 2.
Normal ranges of strain with DeepStrain in healthy subjects.
| ACDC (n = 20) | CMAC ( n = 15) | MARTINOS ( n = 10) | COMBINED (n = 45) | |||
|---|---|---|---|---|---|---|
| Cine | Tagging vs. Cine | Cine ACQ 1 vs. ACQ 2 | Cine | |||
| End-systolic strain (%) | ||||||
| Circumferential | −17.8 (1.6) | −14.2 (2.2) | −15.3 (1.5) | −17.3 (0.7) | −17.5 (0.9) | −16.9 [−17.4 −16.3] |
| Radial | 24.5 (2.9) | 18.4 (5.1) | 19.7 (3.4) | 25.9 (3.4) | 25.7 (4.1) | 23.2 [22.0 24.4] |
| Systolic strain rate (s −1 ) | ||||||
| Circumferential | −1.1 (0.2) | −0.9 (0.1) | −1.2 (0.2) | −1.0 (0.2) | −1.0 (0.2) | −1.1 [−1.2 −1.1] |
| Radial | 1.3 (0.4) | 1.0 (0.2) | 1.3 (0.2) | 1.7 (0.3) | 1.6 (0.3) | 1.4 [1.3 1.5] |
| Early-diastolic strain rate (s −1 ) | ||||||
| Circumferential | 0.7 (0.2) | 1.2 (0.2) | 0.8 (0.1) | 1.0 (0.2) | 1.0 (0.2) | 0.80 [0.73 0.86] |
| Radial | −1.4 (0.5) | −1.2 (0.5) | −1.4 (0.3) | −1.8 (0.3) | −1.7 (0.4) | −1.5 [−1.6 −1.3] |
Tagging-based measures are shown for the CMAC cohort. DeepStrain repeatability is shown for two acquisitions (ACQ). MEVIS was used to calculate tagging measures. Data are presented as mean (standard deviation), and as mean [95% confidence interval] for all three datasets combined.