Fig. 9

Graph showing difference between ROIs. Raw-data analysis was performed to compute F with 1-nearest-neighbor (NN) classification and no feature standardization. Same samples and ROIs were used in both pre- and post- image compression. a 1.5 T uncompressed DICOM; Fisher coefficient computation with controls: Cmin = (0, −1, 0); Cmax = (307, 1, 120,000); F = 426.0; MDE = 0%. b Same 1.5 T samples: zoomed in, mostly on the y-axis. c same 1.5 T after compression to 8 bits; Fisher coefficient computation with controls: Cmin = (0, −1, 0) Cmax = (30, 1, 120,000); F = 776.0; MDE = 5.56%. d 3 T uncompressed DICOM: F = 1787.0; MDE = 0%. e Same 1.5 T samples: zoomed in, mostly on the y-axis. f Same 3 T after compression to 8 bits. 3 T: F = 2344.3; MDE = 0%