OMG! Ultrasound ghosts!!!
At least that is what I saw when I first glanced at the images in this academic paper. I don't think they are anywhere near pornography as many claim and they certainly aren't detailed enough to show "all that."
I don't think that these things are capable of high resolutions like many claim to be. These machines are not cameras yet many seem to think that they are capable of photographic quality images. Until some are actually somehow leaked or EPIC or some organization gets their hands on the actual images I am going to continue to stand by what I believe.