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Table 2 Details of the sequence parameters

From: Longitudinal assessment of diffusion-weighted imaging during magnetic resonance-guided radiotherapy in head and neck cancer

Parameter

EPI3b

EPI4b

T1w MRI (T1_3D_Tra)

T2w MRI (T2_3D_Tra)

Sequence type

SS-SE-EPIa

SS-SE-EPI

FFEb 3D

MS-SE-TSEc 3D

Acquisition voxel size (mm3)

3 × 3 × 4

3 × 3 × 4.8

1.2 × 1.2 × 2.4

1.2 × 1.2 × 2.2

Slice gap (mm)

0

0

-1.2

-1.1

Field of view (mm3)

400 × 400 × 100

400 × 400 × 202

520 × 298 × 250

520 × 298 × 250

TR/TE (ms)

4811/68

10,392/107

13/4.5

2100/375

Flip angle (°)

90–180

90–180

27

90–(180)

TSE factor

150

Water-fat shift (pix)/bandwidth (Hz)

11.197/19.4

11.180/19.4

0.653/332.6

0.473/459.3

b-values (s/mm2) (averages)

0 (3), 150 (5), 500 (8)

0 (2), 200 (3), 500 (4), 800 (6)

Fat suppression

SPAIRd

SPAIRd

No

No

Duration (min)

3:32

7:17

5:48

6:03

  1. aSingle-shot spin-echo echo-planar imaging
  2. bFast Field Echo
  3. cMulti-shot spin-echo turbo spin-echo
  4. dSpectral Attenuated Inversion Recovery