What is the average propagation speed of ultrasound in soft tissue?
Ultrasound Physics Wave Propagation
Question · Easy
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Propagation Speed Equation
Perform Ultrasound Examinations
Flashcard
Ultrasound waves used in diagnostic imaging are best classified as what type of mechanical wave?
Occupational injury abbreviation for painful neck, shoulder, wrist, or back conditions affecting up to 90% of surveyed sonographers who scan with awkward postures or sustained probe pressure.
Sound and Exams
Guess the Term
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If frequency doubles in soft tissue, what happens to wavelength?
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Assumed Propagation Speed of Soft Tissue
What is the wavelength of a 5 MHz ultrasound beam in soft tissue?
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SI unit of cyclic acoustic frequency equal to one wave cycle per second, with diagnostic medical ultrasound operating in the megascale range from 2 to 15 million cycles per second.
Which acoustic variable describes the concentration of energy in a beam?
Wavelength Shortcut for Soft Tissue
If pressure amplitude is doubled, by what factor does intensity change?
Unit of characteristic acoustic impedance defined as the product of medium mass density and sound speed, typically expressed in mega-units ranging from 1.34 for fat to 1.65 for liver.
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Acoustic impedance is the product of which two properties?
Swap tiles to line up three of the same term.
Term Match
Period
What is the typical attenuation coefficient in soft tissue?
Question · Hard
Eponymous law of acoustics relating the sines of the incident and transmitted angles to the ratio of propagation speeds across a boundary where oblique waves undergo refraction.
A 4 MHz beam travels 6 cm one-way through soft tissue. What is the total one-way attenuation?
Decibel (dB) Definition
Which is the largest contributor to attenuation in soft tissue?
Logarithmic unit of the exponential amplitude attenuation coefficient in the decaying plane-wave equation, equal to approximately 8.686 decibels.
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Snell's law explains which acoustic phenomenon?
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Term Pairs
Soft-Tissue Attenuation Coefficient
Which type of reflection occurs at a smooth, large interface?
First word in the name of the bright, closely spaced reverberation artifact that trails deep to a dense calcification or metallic foreign body.
Rayleigh scattering applies to reflectors that are:
Half-Value Layer (HVL)
The intensity reflection coefficient at a soft tissue–air interface is approximately:
Type of B-mode artifact produced when a strong specular reflector such as the diaphragm redirects the ultrasound pulse to an organ and places a false duplicate deeper along the scan line.
Properties of Ultrasound Waves
Sound as a Mechanical Longitudinal Wave
The range equation states depth equals:
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Acoustic Impedance (Z)
The pulse repetition period is the:
Dark B-mode artifact appearing directly behind a strongly attenuating or calcified structure because pulses reaching deeper tissues have severely reduced acoustic intensity.
Increasing imaging depth has what effect on PRF?
Intensity Reflection Coefficient (IRC)
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