Table 1 Comparison between different imaging modalities that assess strain
| Â | FT-CMR | Myocardial tagging | Speckle tracking Echo |
|---|---|---|---|
Advantages | Unrestricted by acoustic window Employs existing cine imaging Rapid semi-automated analysis | Unaffected by through plane motion. | Widely available Low cost Rapid acquisition Rapid semi-automated analysis High temporal resolution |
Limitations | Temporal resolution Intervendor variability Through plane motion Dependent on access to CMR Requires breath-hold cines Arrhythmia | Temporal resolution Tags fade in diastole Need for acquisition of additional sequences Limited availability Requires breath-hold Complex, time-consuming analysis with dedicated software | Acoustic window Intervendor variability Through plane motion (3D then affected by temporal resolution) |
Frame rate | Lower | Lower | Higher |
Temporal resolution | HR dependent (if HR is 60, it is 30-40 ms). | 35 ms. | 12.5–25 ms. |
Spatial resolution | 1–2 × 1–2 mm in plane resolution. | 1–2 × 2–3 mm in plane resolution. | Pixel size is about 0.3 mm. |