Table 1 T1, T2 and LGE signal intensity characteristics of acute and chronic myocardial infarction at 1.5T and 3T
Field Strength | 3T | 1.5T | ||||||
|---|---|---|---|---|---|---|---|---|
Time Post-MI | Day 7 | Month 4 | Day 7 | Month 4 | ||||
Tissue Type | Remote | Infarcted | Remote | Infarcted | Remote | Infarcted | Remote | Infarcted |
T1 (ms) | 1230 ± 63 | 1563 ± 154 | 1257 ± 138 | 1485 ± 139 | 924 ± 72 | 1104 ± 108 | 976 ± 80 | 1060 ± 116 |
T2 (ms) | 46 ± 4 | 64 ± 9 | 44 ± 4 | 46 ± 3 | 50 ± 4 | 69 ± 5 | 49 ± 5 | 51 ± 6 |
%Change in T1 with respect to Remote | 26 ± 8 | 19 ± 7 | 14 ± 8 | 12 ± 6 | ||||
%Change in LGE signal intensity with respect to Remote | 728 ± 484 | 790 ± 513 | 376 ± 192 | 409 ± 163 | ||||
Sensitivity of Contrast-Free T1 maps | 94% | 95% | 84% | 58% | ||||
Specificity of Contrast-Free T1 maps | 94% | 97% | 74% | 78% | ||||