TABLE 1.
Relevant imaging parameters of different T1 mapping methods in the brain and the livera.
| Matrix size | Voxel size (mm3) | TR (ms) | TE (ms) | TA (min:s) | IR-Rep | Stack-Train | FA (°) | Bandwidth (Hz/Pixel) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| BRAIN | MP-GRASP Protocol 1 | 224 × 224 × 32 | 1.25 × 1.25 × 3 | 2.83 | 1.32 | 2:32 | 17 | 48 | 5 | 1010 |
| MP-GRASP Protocol 2 | 320 × 320 × 32 | 0.875 × 0.875 × 3 | 3.67 | 1.74 | 2:49 | 17 | 48 | 5 | 710 | |
| MP-Dixon-GRASP (3 echoes) | 224 × 224 × 16 | 1.25 × 1.25 × 3 | 6.12 | 1.41 – 4.61 (ΔTE = 1.6) | 2:37 | 17 | 48 | 5 | 1010 | |
| MP2RAGE | 224 × 224 × 32 | 1.25 × 1.25 × 3 | 4000 | 2.83 | 4:18 | N/A | N/A | 4, 5 | 250 | |
| LIVER | MP-GRASP | 256 × 256 × 32 | 1.37 × 1.37 × 5 | 2.63 | 1.22 | 2:58 | 25 | 48 | 5 | 1150 |
| MP-Dixon-GRASP (4 echoes) | 256 × 256 × 16 | 1.37 × 1.37 × 5 | 6.33 | 1.23 – 4.92 (ΔTE = 1.23) | 3:14 | 25 | 48 | 5 | 1150 | |
| BH-MOLLI | 256 × 256 (2D) | 1.37 × 1.37 × 8 | 2.8 | 1.14 | 0:15 (BH) | N/A | N/A | 35 | 1085 | |
a
MP-GRASP and MP-Dixon-GRASP were performed during free breathing for liver imaging. MP2RAGE was used as the reference T1 mapping method for brain imaging and 2D breath-hold MOLLI (BH-MOLLI) was used as the T1 mapping reference method for liver imaging. IR-Rep refers to the number of inversion recovery (IR) pulses (see Figure 1) played out during acquisition. Stack-train refers to the number of angles acquired following each IR-Rep.