The first one is frequency, 4.0 megahertz. It applies obviously to the technical specs of the ultrasound itself. Maybe the others are also technical information regarding the machine or the specifications of the picture-taking, like f-stops are in photography.
humm...alright cuz from my last ultrasound everythings the same in the three pictures except Gn, and D, so i was just wondering what all of those ment. alright thanks. that at least expains one.
Gn could be "gain" and D could be "diameter" or maybe "depth", not sure but I do think they are all just technical specs like AnnieBrooke said on how the ultrasound is set up. And nothing to do your measurements.