Spi Questions And Verified Answers Latest Update 2025
Terms in this set (136)
the likelihood of cavitation during an
what does the mechanical index ultrasound exam
indicate on an ultrasound
system
mechanical index Calculated number related to the likely bioeffects from cavitation
The maximum heating of tissue is the sound beams spatial pulse temporal average (SPTA)
related to
cavitation the action of an acoustic field within a fluid to generate bubbles
stable cavitation: produces bubbles that oscillate in size but do not rupture
2 types of cavitation that occur: transient cavitation: referred as collapse, has the potential to
cause more biological damage.
spta in an unfocused beam below 100mw/cm2
spta in a foucused beam 1 w/cm2
The thermal index indicates Estimated temperature increase in tissue
Which intensity parameter is not SPPA ans SAPA.
applicable for continuous-wave Pulse average intensities do not apply to CW
ultrasound
PW doppler has the highest SPTA value
hydrophone small transducer that measures the characteristics of a sound beam
A hydrophone measures: the acoustic pressure at specific locations within the sound beam
the hydrophone also measures period, PRP, PRF, PD, pressure amplitude and duty factor
acoustic streaming the steady, circular flow of cellular fluids induced by ultrasound
FAT- 1460 m/s (LOWEST PROPAGATION SPEED)
liver- 1555
propagation speed found in tissue m/s blood-
1560 m/s
muscle-1600 m/s
BONE- 4080 m/s (HIGHEST PROPAGATION SPEED)
FREQUENCY
Impedence is not affected by _. 1. STIFFNESS
It is affected by: (3) 2. DENSITY
3. PROPAGATION SPEED
To provide a medium for sound transmission, since ultrasound
what is the purpose of the gel does not propagate through air.
coupling between the Any air between the transducer and skin would cause total
transducer and the skin reflection and poor coupling
An example of specular reflector is pericardium
, shadowing posterior to each Bending of the sound beam due to different media propagation speeds
lateral border of the cyst is
Interference the combination of two or more waves that results in a single wave
phenomenon associated with a pattern
produced by a sound beam after
Diffraction
passing through a small
aperture
diffraction is also known as spherical waves, diffraction patterns, or huygen's wavelets
Terms in this set (136)
the likelihood of cavitation during an
what does the mechanical index ultrasound exam
indicate on an ultrasound
system
mechanical index Calculated number related to the likely bioeffects from cavitation
The maximum heating of tissue is the sound beams spatial pulse temporal average (SPTA)
related to
cavitation the action of an acoustic field within a fluid to generate bubbles
stable cavitation: produces bubbles that oscillate in size but do not rupture
2 types of cavitation that occur: transient cavitation: referred as collapse, has the potential to
cause more biological damage.
spta in an unfocused beam below 100mw/cm2
spta in a foucused beam 1 w/cm2
The thermal index indicates Estimated temperature increase in tissue
Which intensity parameter is not SPPA ans SAPA.
applicable for continuous-wave Pulse average intensities do not apply to CW
ultrasound
PW doppler has the highest SPTA value
hydrophone small transducer that measures the characteristics of a sound beam
A hydrophone measures: the acoustic pressure at specific locations within the sound beam
the hydrophone also measures period, PRP, PRF, PD, pressure amplitude and duty factor
acoustic streaming the steady, circular flow of cellular fluids induced by ultrasound
FAT- 1460 m/s (LOWEST PROPAGATION SPEED)
liver- 1555
propagation speed found in tissue m/s blood-
1560 m/s
muscle-1600 m/s
BONE- 4080 m/s (HIGHEST PROPAGATION SPEED)
FREQUENCY
Impedence is not affected by _. 1. STIFFNESS
It is affected by: (3) 2. DENSITY
3. PROPAGATION SPEED
To provide a medium for sound transmission, since ultrasound
what is the purpose of the gel does not propagate through air.
coupling between the Any air between the transducer and skin would cause total
transducer and the skin reflection and poor coupling
An example of specular reflector is pericardium
, shadowing posterior to each Bending of the sound beam due to different media propagation speeds
lateral border of the cyst is
Interference the combination of two or more waves that results in a single wave
phenomenon associated with a pattern
produced by a sound beam after
Diffraction
passing through a small
aperture
diffraction is also known as spherical waves, diffraction patterns, or huygen's wavelets
