DAVIES SPI QUESTIONS AND ANSWERS
When the sound beam is refracted during a sonographic examination which of the
following might you detect on the ultrasound image? - Answers - lateral misregistration
which of the following best describes the f-number? - Answers - focal length divided by
the aperature
you may observe sound attenuation by all of the following except - Answers -
compression
the propagation speed for sound is the lowest in which of the following biological
tissues? - Answers - fat
Increasing the frequency on a multifrequency transducer from 3.5MHz to 5.0MHz will: -
Answers - decrease the wavelength
When scanning with pulsed-wave Doppler you would affect the acoustic exposure by
changing which of the following? - Answers - PRF
the maximum cyclical change in a quantity is known as - Answers - amplitude
Ultrasound propagation velocity depends on: - Answers - Density and compressibility
Which intensity parameter is not applicable for a continuous-wave ultrasound? -
Answers - SPPA & SAPA
Which transducer will exhibit the LEAST amount of volume averaging? - Answers - a
1.5D or multirow array
The ability to distinguish between adjacent structures that produce echoes of similar
amplitude is termed - Answers - contrast resolution
What array transducer fires all of the elements for each acoustic scan line, using small
time delays to steer the beam? - Answers - phased array
what is an advantage of single-crystal or pure-wave crystal transducers? - Answers -
wide bandwidth
which of the following factors does not affect impedence? - Answers - frequency
When you increase the scan line density in the B-mode image, you improve: - Answers -
lateral resolution
Which phenomenon is associated with a pattern produced by a sound beam after
passing through a small aperture? - Answers - diffraction
, You can reduce beam width to improve spatial resolution in the image by which of the
following? - Answers - focusing
you suspect that a bright spot on the b-mode image is calcification, but posterior
acoustic shadow is not present. how can you best optimize your system to demonstrate
a shadow distal to the calcification? - Answers - increase the transducer frequency
what is the optimal thickness for the matching layer? - Answers - 1/4 of a wavelength
For a linear array transducer consisting of a single row of elements, what method is
most used to focus the beam in the elevational direction? - Answers - mechanical
focusing
acoustic impedence increases with which of the following? - Answers - increased tissue
density and propagation speed
Choose two benefits of tissue harmonic imaging. - Answers - Grating lobe artifacts are
reduced and lateral resolution is improved.
Bulk modulus is closely related to which of the following qualities? - Answers - stiffness
when an electrical signal is applied to a piezoelectric element, what happens to the
element? - Answers - it expands and contracts
What benefit would you obtain by choosing a transducer having a large diameter
compared to one having a small diameter? - Answers - it can focus at greater depths.
what type of transducer could you choose to produce a beam that is symmetrical about
the bea, axis - Answers - annular array
Using a hydrophone you can measure? - Answers - Pressure amplitude and duty factor
Which factor LEAST influences axial resolution? - Answers - beam width
axial resolution is improved with - Answers - Increased band width
Shorter pulse length
Shorter wavelength
increasing the number of transmit focal zones to improve spatial resolution involves the
following tradeoff: - Answers - lateral resolution vs temporal resolution
A study designed to determine if there is an association between an adverse effect in a
population and exposure to a particular agent is a(n): - Answers - epidemiologic study
When the sound beam is refracted during a sonographic examination which of the
following might you detect on the ultrasound image? - Answers - lateral misregistration
which of the following best describes the f-number? - Answers - focal length divided by
the aperature
you may observe sound attenuation by all of the following except - Answers -
compression
the propagation speed for sound is the lowest in which of the following biological
tissues? - Answers - fat
Increasing the frequency on a multifrequency transducer from 3.5MHz to 5.0MHz will: -
Answers - decrease the wavelength
When scanning with pulsed-wave Doppler you would affect the acoustic exposure by
changing which of the following? - Answers - PRF
the maximum cyclical change in a quantity is known as - Answers - amplitude
Ultrasound propagation velocity depends on: - Answers - Density and compressibility
Which intensity parameter is not applicable for a continuous-wave ultrasound? -
Answers - SPPA & SAPA
Which transducer will exhibit the LEAST amount of volume averaging? - Answers - a
1.5D or multirow array
The ability to distinguish between adjacent structures that produce echoes of similar
amplitude is termed - Answers - contrast resolution
What array transducer fires all of the elements for each acoustic scan line, using small
time delays to steer the beam? - Answers - phased array
what is an advantage of single-crystal or pure-wave crystal transducers? - Answers -
wide bandwidth
which of the following factors does not affect impedence? - Answers - frequency
When you increase the scan line density in the B-mode image, you improve: - Answers -
lateral resolution
Which phenomenon is associated with a pattern produced by a sound beam after
passing through a small aperture? - Answers - diffraction
, You can reduce beam width to improve spatial resolution in the image by which of the
following? - Answers - focusing
you suspect that a bright spot on the b-mode image is calcification, but posterior
acoustic shadow is not present. how can you best optimize your system to demonstrate
a shadow distal to the calcification? - Answers - increase the transducer frequency
what is the optimal thickness for the matching layer? - Answers - 1/4 of a wavelength
For a linear array transducer consisting of a single row of elements, what method is
most used to focus the beam in the elevational direction? - Answers - mechanical
focusing
acoustic impedence increases with which of the following? - Answers - increased tissue
density and propagation speed
Choose two benefits of tissue harmonic imaging. - Answers - Grating lobe artifacts are
reduced and lateral resolution is improved.
Bulk modulus is closely related to which of the following qualities? - Answers - stiffness
when an electrical signal is applied to a piezoelectric element, what happens to the
element? - Answers - it expands and contracts
What benefit would you obtain by choosing a transducer having a large diameter
compared to one having a small diameter? - Answers - it can focus at greater depths.
what type of transducer could you choose to produce a beam that is symmetrical about
the bea, axis - Answers - annular array
Using a hydrophone you can measure? - Answers - Pressure amplitude and duty factor
Which factor LEAST influences axial resolution? - Answers - beam width
axial resolution is improved with - Answers - Increased band width
Shorter pulse length
Shorter wavelength
increasing the number of transmit focal zones to improve spatial resolution involves the
following tradeoff: - Answers - lateral resolution vs temporal resolution
A study designed to determine if there is an association between an adverse effect in a
population and exposure to a particular agent is a(n): - Answers - epidemiologic study
