The ABCD Data Analysis and Informatics Center (DAIC) and the ABCD Imaging Acquisition Workgroup developed the imaging protocol used in the present study. These groups harmonized the imaging protocol for all scanner platforms. Imaging data was acquired across 21 sites using the following 3 tesla (3 T) scanner models: Siemens Prisma, Siemens Prisma Fit, General Electric Discovery MR750, Philips Achieva dStream, and Philips Ingenia. Imaging data collection occurred across one to two sessions. Further detail on these methods is documented elsewhere (Casey et al., 2018 (link); Hagler et al., 2019 (link)). Each session included T1‐ and T2‐weighted images of brain structure. Details on the imaging parameters include the following: TR (repetition time) 2400–2500 ms; TE (echo time) 2–2.9 ms; FOV (field of view) 256 × 240 to 256; FOV phase of 93.75%–100%; matrix 256 × 256; 176–225 slices; TI (inversion delay) 1060 ms; flip angle of 8°; voxel resolution of 1 × 1 × 1 mm; total acquisition time from 5 min 38 s to 7 min 12 s.
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Harmonized Multisite MRI Imaging Protocol
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Corresponding Organization : Vanderbilt University
Other organizations : University of Pennsylvania, University of Nevada, Las Vegas
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Variable analysis
independent variables
- None explicitly mentioned
- T1-weighted images of brain structure
- T2-weighted images of brain structure
- Scanner platform (Siemens Prisma, Siemens Prisma Fit, General Electric Discovery MR750, Philips Achieva dStream, and Philips Ingenia)
- Imaging parameters (TR, TE, FOV, FOV phase, matrix, number of slices, TI, flip angle, voxel resolution, total acquisition time)
- No positive or negative controls were explicitly mentioned.
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