Table 2. Technical parameters of different MR sequences.
| Parameters | Two-echo Dixon, SAT/VAT volume | Six-echo Dixon, supraclavicular PDFF | Six-echo Dixon, gluteal PDFF |
|---|---|---|---|
| TR, ms | 4.0 | 7.8 | 8.3 |
| TE1/TE2/ΔTE, ms | TE1 =1.32 | TE1 =1.24 | TE1 =1.34 |
| TE2 =2.60 | ΔTE =1.00 | ΔTE =1.10 | |
| Flip angle | 10° | 5° | 5° |
| Bandwidth, Hz/pixel | 1,004 | 1,413 | 1,437 |
| Acquisition matrix size | 332×219×44 | 268×201×93 | 200×267×40 |
| Reconstruction matrix size | 512×512 | 288×288 | 320×320 |
| Field of view (FOV), mm3 | 500×445×220 | 400×300×140 | 400×400×60 |
| Acquisition voxel | 1.5×2.03×5.0 | 1.5×1.5×1.5 | 1.5×1.5×1.5 |
| Reconstructed voxel, mm3 | 0.98×0.98×5.00 | 1.389×1.389×1.500 | 1.25×1.25×1.50 |
| Slices | 44 | 93 | 40 |
| SENSE reduction factor | 2.5x1.0 (AP 2.5) | 2.5×1.0 (AP 2.5) | 2.5×1.0 (LR 2.5) |
| Partial Fourier | 075×0.80 | No | No |
| Respiratory triggering | No | Yes | No |
| Scan time | 10 s | 2 min 30 s | 46 s |
TE1, first echo time; TE2, second echo time; ΔTE, difference between echo times. AP, anterior posterior; FOV, field of view; LR, left right; MR, magnetic resonance; PDFF, proton density fat fraction; SAT, subcutaneous adipose tissue; TR, repetition time; TE, echo time; SENSE, sensitivity encoding; VAT, visceral adipose tissue.