Acquisition protocols were based on the Pediatric Imaging Neurocognition and Genetics study (PING) (Brown et al., 2012 (link)), which harmonized parameters across imaging platforms. Whole brain high-resolution structural anatomical images were acquired in the sagittal plane using a T1 weighted MPRAGE scanning sequence (CHLA: Philips Achieva v3.2.1, echo time (TE) = 3.185 ms, repetition time (TR) = 6.795, slice thickness = 1 × 1.2 × 1 mm3 isotropic; Emory: Siemens Trio Syngo MR B17, TE = 4.33 ms, TR = 2170, slice thickness = 1 × 1.2 × 1 mm3 non-isotropic; SDSU: GE Discovery MR750 DV22.0_V02_1122, TE = 2.984, TR = 7.38, slice thickness = 1 × 1.2 × 0.9 mm3 isotropic; UMN: Siemens Trio Syngo MR B17, TE = 4.33 ms, TR = 2170, slice thickness = 1 × 1.2 × 1 mm3 non-isotropic).
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