Not so, if you use a pair of specialised ultrasonic transducer arrays to move the ... a few research papers hinting at the ability to use ultrasound to propel through air, like this one (bah!

Many ultrasounds are noninvasive. An invasive ultrasound (when the transducer is placed inside a body cavity) may be needed ...

All improved after treatment, and in the last dog, the calcified mass inside the prostate ... the tumour and live data from the ultrasound probe. The HIFU transducer itself is novel: a flexible ...

Ultrasound imaging creates a picture of something that cannot be seen directly, such as an unborn baby in the womb, or faults and defects inside manufactured parts. These uses rely on what happens ...