How actuate are the ultrasound measurements?

Depends on what it i: The accuracy & precision of an ultrasound machine depends on many factors, including the freq of the ultrasound transducer (higher frequency = better resolution), but also the structure imaged: the deeper the object, the lower the frequency used, to get penetration. Also, the tech/user technique comes into play: did they get the angle right? How hard do they press? Doppler flow is similarly variab