Table 2.
Clinical MR protocols used for the acoustic noise evaluation of the NICU MR system
| Sequence | TR (ms) | TE (ms) | FA (degrees) | FOV (mm) | Matrix | Slice thickness (mm) | # slices | Receiver bandwidth (±kHz) | Other |
|---|---|---|---|---|---|---|---|---|---|
| Brain | |||||||||
| T1 FLAIR – Sag | 2,200 | 27 | 180/90/180 | 160 | 256×320 | 3 | 18 | 31.25 | TI=750 ms |
| PD/T2 FSE – Ax | 4,000 | 10/121 | 90/180 | 160 | 256×256 | 3 | 27×2 | 20.83 | ETL=12 |
| T2* MPGR – Ax | 600 | 30 | 20 | 160 | 256×256 | 4 | 1 | 15.6 | |
| T1 IR prepared 3-D SPGR – Sag | 6.5 | 3.1 | 14 | 160 | 256×256 | 1.2 | 192 | 15.6 | TI=650 ms |
| DTI – Ax | 10,000 | 99 | 90/180 | 180 | 128×128 | 3 | 32 | 250 | 15 directions, b=800 s/mm2; ETL=128 |
| BOLD EPI – Ax | 2,000 | 35 | 90 | 180 | 64×64 | 3 | 32 | 250 | ETL=64 |
| Abdomen/chest | |||||||||
| 3-D T1 LAVA – Sag | 5.5 | 2.32 | 12 | 180 | 160×288 | 3.4 | 68 | 62.5 | |
| bSSFP – Ax and Cor | 4.2 | 1.3 | 70 | 180 | 224×256 | 4 | 28 | 62.5 | |
| SSFSE – Cor and Ax | 1,160 | 103 | 90/180 | 180 | 192×256 | 4 | 21 | 62.5 | ETL=96; 0.5 NEX |
| bSSFP cine cardiac – Obl | 3.6 | 1.3 | 45 | 250 | 192×192 | 5 | 1 | 62.6 | 20 phases |
Ax axial plane, BOLD blood oxygenation level dependent, bSSFP balanced steady state free precession, Cor coronal plane, DTI diffusion tensor imaging, EPI echo planar imaging, ETL echo train length, FA flip angle, FLAIR fluid-attenuated fast spin echo, FOV field of view, FS fat saturated, FSE fast spin echo, IR inversion recovery, LAVA liver acquisition volume acceleration, MPGR multiplanar gradient recalled acquisition in the steady state, NEX number of excitations, Obl oblique plane, PDW proton-density-weighted, Sag sagittal plane, SPGR spoiled gradient echo, SSFSE single-shot fast spin echo, T1 T1-weighted, T2 T2-weighted, T2* T2*-weighted, TE echo time, TI inversion time, TR repetition time