What is enhancement caused by? - ANS weakly attenuating structures
What is the multipath artifact? - ANS artifact caused by the sound beam bouncing off several different reflectors
What is the typical value of PRF in diagnostic ultrasound? - ANS 1000-10,000 Hz or 1-10 ...
What is enhancement caused by? - ANS weakly attenuating structures
What is the multipath artifact? - ANS artifact caused by the sound beam bouncing off
several different reflectors
What is the typical value of PRF in diagnostic ultrasound? - ANS 1000-10,000 Hz or 1-10
KHz
What are specular reflections? - ANS reflections that occur when the sound impinges upon
a large, smooth reflector at a 90 degree angle.
What are non-specular reflections? - ANS reflectors that are smaller than the wavelength of
the incident beam
Half-intensity depth - ANS the depth at which sound has lost half of its intensity
phase quadrature - ANS the component of the Doppler device that determines positive
opposed to negative frequency shifts and, therefore, direction of blood flow
Fast Fourier Transform (FFT) - ANS a mathematical process used for analyzing and
processing the Doppler signal to produce the spectral waveform
What describes the distance from the beginning of a cycle to the end of that cycle? - ANS
wavelength
What reduces pulse duration? - ANS damping
What are harmonic signals? - ANS the result of sound traveling through the tissue and
inducing a vibration?
What are the three primary acoustic variables? - ANS pressure, density, distance(particle
motion)
What is backscatter? - ANS scattered sound waves that make their way back to the
transducer and produce an image on the display
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