Name: Score:
49 Multiple choice questions
Term
Which of the following is an appropriate unit of measurement for propagation speed?
watts per square centimeter (w/cm^2)
kilohertz (khz)
millimeters per microsecond (mm/ μ s)
1 mhz1 of 49
Term
The maximum value or minimum value of an acoustic variable minus the equilibrium value of
that variable describes the:
Frequency
Intensity
Wavelength
Amplitude2 of 49
Term
If the angle of incidence is 40 ° , what is the angle of transmission at the interface if medium 1 has
a propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s?
>30 °
>40 °
>20 °
>39 °3 of 49 Term
Density and propagation speed are:
Inversely related
Directly proportional
Unrelated
Compressions4 of 49
Term
Which of the following is considered the speed of sound in soft tissue?
4080 m/s
1.54 m/s
1540 m/s
330 m/s5 of 49
Term
What is defined as the ability of the ultrasound system to image structures that are positioned
parallel to the sound beam as separate structures?
Decrease
Duty factor
Frequency
Axial resolution6 of 49
Term
Pressure is typically expressed in:
Watts
Frequency
Pascals
Bone7 of 49 Term
The inertia of the medium describes its:
Amplitude
Wavelength
Density
Frequency8 of 49
Term
The percentage of time that the ultrasound system is producing pulses of ultrasound describes
the:
Stiffness
Frequency
Duty factor
Pulse repetition frequency9 of 49
Term
What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore
includes both the "on" and "off" time?
Intensity
Intensity is halved
Attenuation
Absorption
Scattering
Attenuation is a decrease in the amplitude, power, and intensity of the sound beam as
sound travels through tissue. There are three mechanisms of attenuation: absorption,
reflection, and scattering.
Rarefaction
Rarefaction is an area in the sound wave where the molecules are spread wider apart.10 of 49 Term
Which of the following is defined as only the active time?
Wavelength
Pulse repetition frequency
Pulse duration
Frequency11 of 49
Term
Areas of high pressure and density are referred to as:
Amplitude
Compressions
Intensity
Frequency12 of 49
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