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Rayleigh scattering occurs if the particle dimensions are 

The resistance to flow offered by a fluid in motion is called

Increasing the frequency of an ultrasonic longitudinal wave will result in which of the following changes in the velocity of the wave? 

To proceed from a measurement of Doppler shift frequency to a calculation of flow speed, _______________ must be known or assumed.

Increasing the packet size of the color Doppler will decrease the:

A curving vessel within a color-flow image shows color in the vessel when the beam and vessel are parallel but shows no color, as the vessel turns perpendicular to the beam. The loss of color means that 

Duplex imaging combines gray scale with Doppler and can appear as 

Which of the following arranges media in terms of propagation velocity, from lowest to highest? 

Which best describes the effect of damaged transducer elements in the B-mode imaging?

The tissue of greatest concern regarding bioeffects in an ultrasound exam is the ____________.