Page 204 - Like me, or else... - Michelle Achterberg

Chapter 7
different noncollinear diffusion directions with b-factor 1,000 s/mm2 and 5 diffusion-unweighted volumes (b-factor 0 s/mm2); anterior -posterior phase encoding direction; parallel imaging SENSE factor = 3; flip angle = 90°; 75 slices of 2 mm; no slice gap; reconstruction matrix 128 × 128; FOV = 240 × 240 mm; TE = 69 ms; TR = 7,315 ms. The second DWI set had identical parameter settings as used for the first set except that it was acquired with a reversed k-space readout direction (posterior-anterior phase encoding direction) enabling the removal of susceptibility artifacts during post processing (Andersson et al., 2003). Resting state data was acquired at the end of the imaging protocol (for details see Achterberg et al. (2018a)). A total of 142 T2 -weighted whole-brain echo planar images (EPIs) were acquired, including 2 dummy volumes preceding the scan to allow for equilibration of T1 saturation effects (TR = 2.2 sec; TE = 30 ms; flip angle = 80°; FOV = 220.000 (rl) x 220.00 (ap) x 111.65 (fh); 37 slices).
Figure 1. Emotional state towards the MRI scan. A) Visual analogue scales. B) Estimation of excitement and tension on three moments (before MRI simulation, before MRI scan, and after MRI scan) and by three raters (child, researcher, and parent).
202