Fig. 1: Measures of contrast-to-noise ratio (CNR) for the T1w and T2w scans, and temporal SNR (tSNR) for the rfMRI scans.
From: The MR neuroimaging protocol for the Accelerating Medicines Partnership® Schizophrenia Program
Values are per scan by site, colored by scanning platform and with different symbols for different types of head coils. The entry for ‘32ch’ coil represents the product 32-channel coil provided by each vendor. Two of the GE MR750 sites (CA, KC) used the Nova Medical 32-channel head coil instead of the GE-provided coil. The ‘64ch’ coil is the Siemens 64-channel “HeadNeck” coil. Measures are “image quality metrics” (IQMs) computed by MRIQC98. Numbers at the top of each plot are the scans included in the analysis for each site. If available, both baseline and month 2 visit data were included. For the rfMRI tSNR data, up to 4 scans are included per participant per visit (‘AP’ and ‘PA’ polarity scans, each collected twice per visit). The black vertical lines associated with each site are the inter-quartile range; the horizontal black tick is the median. (Both are without regard to the VE11 vs. XA30 distinction for the Prisma sites that have transitioned software platform).
