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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.

Artifacts may appear in ultrasound images when reverberations occur.

A wave with a frequency between about 20 and 20,000 Hz is a sound wave that is audible to the human ear.

An ultrasonic beam propagates from medium 1 into medium 2. If the incident angle is smaller than the refraction angle, the sound velocity in medium 1 is higher than that in medium 2.

When an ultrasound beam propagates from medium 1 into medium 2, it has 50% reflection. Assume medium 1 has an acoustic impedance of 1 MRayl. The impedance of medium 2 is: