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

Increasing the degree of transducer damping will reduce the lateral resolution.

The divergence angle of an ultrasound beam from an unfocused transducer decreases with decreasing the transducer diameter.

Ultrasound is a transverse, mechanical wave.

If the attenuation coefficient of an ultrasound beam is 1dB cm-1 MHz-1, the attenuation of an ultrasound at 2 MHz passing through a 1.5 cm thick tissue is

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

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.

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

The main reason of using ultrasound gel between a scanner and the skin is to allow the scanner to move smoothly on the skin.

A 28-year-old client presents to the clinic with complaints of fever, muscle aches, sore throat, and swollen lymph nodes. The client reports unprotected sexual intercourse with a new partner approximately two weeks ago.  HIV testing is ordered, and the client’s CD4+ T-cell count is 720 cells/mm³.  Based on these findings, which stage of HIV infection is the client most likely experiencing?