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Signal-to-noise ratio can be improved by using higher ultrasound frequency.

Tissues behind a bone can be easily imaged with an ultrasound.

Ultrasound is an electromagnetic wave with a long wavelength.

A B-mode ultrasound image of a tissue consists of 256 lines. Assume the ultrasound speed in the tissue is 1540 m/s. What is the maximum tissue thickness that can be imaged with a frame rate at 30 Hz?

If the ultrasound speed in the tissue is 1540 m/s, how short does the ultrasound pulse need to be in order to resolve a 1-mm thick tissue layer?

The frequency used for medical ultrasound imaging is typically between 20 KHz and 1 MHz.

When an ultrasound wave propagates through a 10-cm thick medium, the molecules in the medium may just move very short distances (a few tenths of a nanometer) about a fixed mean position.

The thinner the piezoelectric crystal, the higher the resonant frequency that may be created.

Ultrasound is a transverse, mechanical wave.

In order to increase the ultrasound imaging frame rates, the line density needs to be increased.