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?

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

Application of a voltage across a piezoelectric crystal causes the crystal either contract or expand depending upon the polarity of the voltage.

A 3D ultrasound image may be formed by moving a sequential linear array in the direction perpendicular to the array.

A single continuous-wave ultrasound transducer can be used for the measurements of blood velocity through Doppler effects, as the same transducer can be used to launch an ultrasound beam and to receive the echo signals.

When an ultrasound beam propagates from medium 1 into medium 2, it has 30% reflection from the interface. When another ultrasound beam propagates in the opposite direction from medium 2 into medium 1, the reflection from this interface is

When an ultrasound beam is focused tighter, the depth of focus becomes larger.

Ultrasound imaging is an ionizing approach with certain radiation risk.

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.

Microbubbles may be used as contrast agents for ultrasound detection.