Source: Catherine Westbrook and John Talbot, MRI in Practice, 5th ed., John Wiley & Sons, 2019.
| 1.5 T | 3T | |||
|---|---|---|---|---|
| CSE | CSE | |||
| Short TE | Minimum–30 ms | Short TE | Minimum–15 ms | |
| Long TE | 70 ms+ | Long TE | 70 ms+ | |
| Short TR | 300–700 ms | Short TR | 400–800 ms | |
| Long TR | 2000 ms+ | Long TR | 2500 ms+ | |
| FSE/TSE | FSE/TSE | |||
| Short TE | Minimum – 20 ms | Short TE | Minimum–15 ms | |
| Long TE | 90 ms+ | Long TE | 90 ms+ | |
| Short TR | 400–600 ms | Short TR | 400–600 ms | |
| Long TR | 4000 ms+ | Long TR | 4000 ms+ | |
| Short ETL/TF | 2–6 | Short ETL/TF | 2–6 | |
| Long ETL/TF | 20+ | Long ETL/TF | 20+ | |
| IR T1 | IR T1 | |||
| Short TE | Minimum–20 ms | Short TE | Minimum–20 ms | |
| Long TR | 3000 ms+ | Long TR | 3500 ms+ | |
| TI | Short or null time of tissue | TI | Short or null time of tissue | |
| Short ETL/TF | 2–6 | Short ETL/TF | 2–6 | |
| STIR | STIR | |||
| Long TE | 60 ms+ | Long TE | 60 ms+ | |
| Long TR | 3000 ms+ | Long TR | 3000 ms+ | |
| Short TI | 100–175 ms | Short TI | 210 ms | |
| Long ETL/TF | 20+ | Long ETL/TF | 20+ | |
| FLAIR | FLAIR | |||
| Long TE | 80 ms+ | Long TE | 80 ms+ | |
| Long TR | At least 4× TI | Long TR | At least 4× TI | |
| Long TI | 1700–2500 ms | Long TI | 1700–2500 ms | |
| Long ETL/TF | 20+ | Long ETL/TF | 20+ | |
| Rewound GRE | Rewound GRE | |||
| Long TE | 10–15 ms | Long TE | 10–15 ms | |
| Short TR | <50 ms | Short TR | <50 ms | |
| Flip angle | 30° to 45° | Flip angle | 30° to 45° | |
| Spoiled GRE | Spoiled GRE | |||
| Short TE | Minimum | Short TE | Minimum | |
| Short TR | <50 ms | Short TR | <50 ms | |
| Flip angle | 30° to 45° | Flip angle | 30° to 45° | |