Table 1 Summary of imaging and reconstruction parameters for the water-fat data.

From: Automated segmentation of human cervical-supraclavicular adipose tissue in magnetic resonance images

Imaging parameter

Value

Pulse sequence

3D multi gradient echo sequence

Coil

16 channel neurovascular receive coil

Scan time

4 min 40 s

Orientation

Axial

Repetition time

32.7 ms

Echo time 1/Echo time spacing

1.68/2.87 ms

Number of echoes

6 (unipolar)

Flip angle

6°

Water-fat shift

0.25 voxels

Fold-over direction

AP

SENSE acceleration

1.5 (AP direction)

Field of view (RL × AP × FH)

480 × 200 × 50 mm3

Acquired/Reconstructed voxel size

1.0 × 1.0 × 2.0/1.0 × 1.0 × 2.0 mm3

Number of slices

25

Number of signal averages

2

Water-fat reconstruction parameter

Value

Fat spectral model

Nine-peak

R2 * estimation strategy

Single R2 * estimation (decoupled determination)

Regularization parameter (μ)

10

  1. Data were acquired under shallow breathing to reduce motion artefacts. The flip angle was chosen small to reduce T1-weighting. No contrast agents or pharmacological agents were administered. Data were reconstructed using a previously described method12. RL = right-left, AP = anterior-posterior, FH = feet-head direction. The regularization parameter, μ, reflects the influence of assumed magnetic field spatial smoothness, and hence the influence of noise, in fitting of the water-fat MRI signal model to the data12.
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