US Physics 31-60

The mass you are imaging has a diameter of 35 mm. This value can also be expressed as:

Relative measurement of intensity based on a logarithmic scale is expressed in:

Which prefix equals 10-³?

When you change the transmit frequency, which of the following is altered?

While performing a Doppler ultrasound examination, you adjust the pulse repetition frequency to 12 kHz. This can also be expressed as:

In sound wave propagation, a region of elevated pressure is termed:

When you switch from a 2.5 MHz to a 5 MHz transducer, the sound wavelength:

Wavelength depends on what two factors?

Which of the following human tissue has the highest rate of attenuation of an ultrasound wave?

The propagation speed for sound is lowest in which of the following biological tissues?

Which of the following factors does not affect impedance?

You are imaging a structure containing two media having the same acoustic impedance. What will occur at the boundary of the two structures?

What is the purpose of the gel coupling between the transducer and the skin?

The unit of impedance is the:

With absorption, acoustic energy is converted to:

The intensity transmission coefficient at the interface between two structures equal 1/100. What us the intensity reflection coefficient?

Which of the following is an example of a Rayleigh scatterer?

Which of the following sound interactions produced the shadows indicated by the arrows on the image?

In order to display a structure on your sonographic image, the sound beam must be reflected at the interface. What is required for sound reflection at the interface of two structures?

An example of a specular reflector is:

What system control can you adjust to compensate for the effect of sound attenuation in the body?

While imaging a cyst, you notice shadowing posterior to each lateral border of the cyst. What is the source of the shadows?

The algebraic summation of waves leading to patterns of minima and maxima is called:

An interaction of echoes that leads to reinforcement rather than to partial or total cancellation is known as:

Which phenomenon is associated with a pattern produced by a sound beam after passing through a small aperture?

What sound parameter is determined only by the medium?

Snell's law describes:

As a general observation about media in diagnostic sonography, sound propagates faster in materials with greater:

During the performance of a sonogram you would be most likely to encounter refraction in this view:

You may observe sound attenuation by all of the following: Reflection, Scattering, Conversion of sound to heat and Absorption.