Analysis of “acceptable image” crossover point. A. Histogram of n = 320 crossover points from 8 readers, displayed in bins 5 JPEG Q points wide (hatched bars, mean = 23.1 ± 7.0), with a Gaussian curve fit to the data (solid line, mean = 23 ± 8.1). B. Crossover points according to subject. Subjects (1–8) are displayed on the x axis; each data point shows the crossover point for each of the 40 image stacks shown to each subject. Solid horizontal lines show the mean crossover point for each subject.
Flint BMC Medical Imaging 2012 12:24 doi:10.1186/1471-2342-12-24