Table 1. Scan parameters used to acquire the 2D-neuromelanin-sensitive MRI and each quantitative map (T1, T2, and T2*).
| Neuromelanin-sensitive MRI | Maps | |||
|---|---|---|---|---|
| T1 | T2 | T2* | ||
| Scan sequence (Fast imaging mode) | TSE | IR-TFE | TSE | TFE |
| TSE or TFE factor | 5 | 15 | 15 | - |
| Echoes | 1 | 1 | 5 | 32 |
| TR [ms] | 623 | 11 | 3000 | 640 |
| TE [ms] | 13 | 5.6 | 20 #2 | 2.3 #3 |
| TI delay [ms] | - | 86.1 | - | - |
| Trigger delay max./act. [ms] | - | 700/97.8 #1 | - | - |
| FA [deg] | 90 | 7 | 90 | 28 |
| FOV [mm] | 180 | 180 | 180 | 180 |
| Slices | 5 | 1 | 1 | 1 |
| Slice thickness/gap [mm] | 2.0/0.2 | 2.0/0.0 | 2.0/0.0 | 2.0/0.0 |
| Reconstruction voxel matrix per slice [mm] | 0.18/0.18/2.00 | 0.35/0.35/2.00 | 0.35/0.35/2.00 | 0.35/0.35/2.00 |
| NSA | 10 | 4 | 1 | 2 |
| Scan duration [mm:ss] | 07:18 | 06:48#4 | 03:42 | 02:45 |
MRI, magnetic resonance imaging; TSE, turbo spin-echo; IR-TFE, inversion recovery turbo field-echo; TFE, turbo field-echo; TR, repetition time; TE, echo time; TI, inversion time; FA, flip angle; FOV, field of view; NSA, number of signals averaged; ECG, electrocardiogram; RR interval, R wave to R wave interval.
#1 from 98 ms, phase interval 172.1 ms, 24 phases;
#2 from 20 to 140 ms, step 30 ms, 5 echoes;
#3 from 2.3 to 74 ms, step 2.3 ms, 32 echoes.
#4 dummy ECG pulse: on,
Number of RR intervals: 1, Entered heart rate: 60 bpm.