10 9 Hz, 1000 times the frequency of normal medical ultrasound) generated by ultrafast lasers. These sound waves do not naturally focus, which limits the clarity of the images they are able to obtain.

Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing – above 20,000 Hertz (Hz). Different ...

Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing - above 20,000 Hertz (Hz). Different species ...

Details to help new and experienced clinicians perform ultrasound-guided vascular cannulation have been added to updated guidelines from the American Society of Echocardiography. “Ultrasound ...