I haven't heard of it until I saw the link. I don't know if it is offered here in Oz. if it is it has been held top secret. One thing I did learn about regular MRI's is that they can't always show the real picture because we take them laying on our backs, but we are not laying on our backs throughout the day. We are moving and twisting around. Things can look and be very different when you are moving around as opposed to laying down. Also in the case of sensory nerves at least, neighboring nerves can get irritated and communicate with each other sending more pain signals. This may At least partially explain the widespread dermatomal pattern.

Aussie