Fig. 1

“Do you see what I see?”. Fetal brain. a Left 1.5 T. b Right 3 T. This figure was incorporated and so-titled in this manuscript to illustrate that magnetic resonance (MR) images can be used for evaluation of achromatic vision and sensitivity to change in grayscale quality between different subjects. For fair comparison, this exercise should be blinded. It is recommended to have at least two radiologists, if not available, medically-trained practitioners or any volunteers (blinded) and one examiner (also blinded) to look at the images side-by-side, on two medical-diagnostic monitors, engineered for 16-bit display (same brand/model in natively flat display mode: i.e. without any added enhancements). All in-computer/in-monitor RT (real-time) editing features must be turned off (incl. hardware/software rendering): n.b. 16-bit of true data has more room for “contrast booster”—which is essentially an illusion, as a result of post-editing artifacts, not really part of the image. In this investigation, volunteers were asked to identify the images unlabeled (, of course). It was observed that both images were equally sharp (in pass-through mode), for a normal, naked human eye. There flows the explanation for the research goal to mathematically determine which MR modality actually produces images with more captured details. Both images were 16-bit encoded, and the difference could not be measured via “perceived dynamic range” (visible details). With computer vision software, 1.5/3 T images can be numerically decoded to accurately assess “available dynamic range” (visible/invisible details)