SPI Exam Pool Questions and answers. 100% Accurate, graded A+.
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SPI Exam Pool Questions and answers. 100% Accurate, graded A+.
What is described as the ability of an object to resist compression and relates to the hardness of a medium? - stiffness
An increase in PRF would lead to - an increase in DF
what has the higher propagation speed? air, bone, ...
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SPI Exam Pool Questions and answers.
100% Accurate, graded A+.
What is described as the ability of an object to resist compression and relates to the hardness of a
medium? - ✔✔stiffness
An increase in PRF would lead to - ✔✔an increase in DF
what has the higher propagation speed? air, bone, soft tissue or water - ✔✔bone
what has a lower propagation speed? water, soft tissue, bone or lung tissue - ✔✔lung tissue
as imaging depth increases, the PRF must - ✔✔decrease
what law describes the amount of refraction that occurs at an interface? - ✔✔Snell's law
pressure is typically expressed in - ✔✔pascals
the typical range of frequency for diagnostic ultrasound imaging is - ✔✔1 to 20 MHz
the attenuation coefficient in soft tissue is equal to - ✔✔one-half of the operating frequency
micro denotes - ✔✔millionth
what is described as the distance over which one cycle occurs - ✔✔wavelength
what requires an oblique interface and a propagation speed mismatch - ✔✔refraction
,areas of high pressure and density are referred to as - ✔✔compressions
spl can be calculated by - ✔✔multiplying the number of cycles by the wavelength
density is typically measured in - ✔✔Kilograms per centimeter cubed
as a sound wave travels through the human body, the intensity of the sound wave decreases as a result
of - ✔✔attenuation
what is the total attenuation that occurs if a 6 MHz sound beam travels through 4 cm of soft tissue -
✔✔12 dB, attenuation= f/2 * pL
as imaging depth increases, PRP - ✔✔increases
what are the units of df - ✔✔unitless
the percentage of time that the ultrasound system is producing pulses of ultrasound describes the -
✔✔df
density and propagation speed are - ✔✔inversely related
what is determined by the sound source and medium - ✔✔wavelength
what is defined as the number of ultrasound pulses emitted in 1 second - ✔✔prf
what is defined as only the active time - ✔✔pd
the intertia of the medium describes its - ✔✔density
,what is determined by the sound source only - ✔✔frequency
if the angle of incidence is 40 degrees, 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 - ✔✔less than 40
degrees
the change in the direction of the original sound wave that occurs when sound interacts with two
different tissue types that have a different propagation speed is - ✔✔refraction
which of the following is an appropriate unit of measurement for propagation speed - ✔✔millimeters
per microsecond
the major component of attenuation is: - ✔✔absorption
in clinical imaging, the wavelength typically measures between - ✔✔.1 to .8 mm
the df for cw ultrasound is - ✔✔100%
what is the change in intensity if the power decreases by half - ✔✔intensity is halved
damping of the sound beam - ✔✔reduces the spl
adding damping to the transducer improves which type of resolution - ✔✔axial
what time is defined as the beginning of one pulse to the beginning of the next pulse and, therefore,
includes both the "on" and "off" time - ✔✔prp
what are the units for pressure - ✔✔pascals or pounds per square inch
, what term is defines as "the power of a wave divided by the area over which the power is distributed" -
✔✔intensity
transducers have material within them that, when electronically stimulated, produces ultrasound waves.
This is most likely some form of: - ✔✔lead zirconate titanate
what is the change in power if the amplitude triples - ✔✔it increases nine times
the portion of the sound beam where the molecules are farther apart describes an area of -
✔✔rarefraction
if only the density of a medium is increased, then the - ✔✔propagation speed will decrease
sound is technically a - ✔✔mechanical and longitudinal wave
the maximum value or minimum value of an acoustic variable minus the equilibrium value of that
variable describes the - ✔✔amplitude
what is the speed of sound in soft tissue - ✔✔1540 m/s
what is considered the narrowest part of a sound beam - ✔✔focal zone
what part of the transducer stops the ringing of the element - ✔✔damping material
along with image depth, what also determines frame rate - ✔✔number of lines per frame
which type of resolution is an accurate representation of moving structures - ✔✔temporal resolution
if the depth is increased and the frame rate is unchanged, what must have decreased - ✔✔the number
of lines per frame
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