DAVIES SPI REVIEW / STUDY GUIDE – EXPERT VERIFIED ACTUAL QUESTIONS & ANSWERS FOR GUARANTEED PASS
Will not cause a redirection of part of the ultrasound energy ✔️absorption
You are scanning a large mass composed primarily of fat. What will you most likely encounter? ✔️axial misregistration of object distal to the
mass on the screen due to the slower propagation speed through fat
What 2 conditions must be present to cause a refraction in soundwave? ✔️oblique incidence and
change in propagation speed
What may be detected with refraction? ✔️lateral misregistration
Of the following structures, which is the most attenuating: blood, bile, lung tissue, calcification? ✔️calcifications - leaves a shadow
What can you do to enhance the visibility of specular reflectors? ✔️perpendicular incidence
What tissue/sound interaction is primarily responsible for imaging internal structures of organs? ✔️scattering
What tissue/sound interaction is necessary for an ultrasound image? ✔️reflection
For soft tissues, what is needed for determining what a specific impedance is? ✔️bulk modulus and interface
You are imaging a structure that is highly attenuating. What imaging artifact would you expect to encounter? ✔️shadowing
Does sound travel slower through air or through soft tissue? ✔️air
An increase in transmit power changes what? ✔️acoustic power
What would you change if image does not show adequate penetration in far field and shows noise instead of tissue? ✔️decrease the transmit
frequency because lower frequency penetrates better
What is the range of frequencies for human hearing? ✔️20Hz - 20,000Hz
Maximum cyclical change in quantity is known as? ✔️amplitude
Bulk modulus is closely related to? ✔️stiffness
Time it takes for one ? ✔️period
If number of cycles in a pulse is increased but wavelength remains the same, what changes? ✔️pulse duration
Which transducer would you use for a large patient that would have the least amount of signal attenuation? ✔️lower frequency - goes deeper
Speed of ultrasound in bone? ✔️4080 m/s
Speed of sound is defined as? ✔️speed at which sound propagates through a medium
Longitudinal wave is characterized by? ✔️it travels in one direction
What regions of a wave show decreased particle density in a medium? ✔️rarefaction
Terms used to describe the strength of a sound beam? ✔️amplitude,
intensity
Ultrasound propagation velocity depends on? ✔️density and compressibility (stiffness)
The frequency of the transmission signal is determined by? ✔️the frequency of the electric signal applied to the transducer
When you adjust PRF, you are changing what? ✔️the number of pulses per second
Time it takes for one pulse to occur is known as? ✔️pulse duration
Will not cause a redirection of part of the ultrasound energy ✔️absorption
You are scanning a large mass composed primarily of fat. What will you most likely encounter? ✔️axial misregistration of object distal to the
mass on the screen due to the slower propagation speed through fat
What 2 conditions must be present to cause a refraction in soundwave? ✔️oblique incidence and
change in propagation speed
What may be detected with refraction? ✔️lateral misregistration
Of the following structures, which is the most attenuating: blood, bile, lung tissue, calcification? ✔️calcifications - leaves a shadow
What can you do to enhance the visibility of specular reflectors? ✔️perpendicular incidence
What tissue/sound interaction is primarily responsible for imaging internal structures of organs? ✔️scattering
What tissue/sound interaction is necessary for an ultrasound image? ✔️reflection
For soft tissues, what is needed for determining what a specific impedance is? ✔️bulk modulus and interface
You are imaging a structure that is highly attenuating. What imaging artifact would you expect to encounter? ✔️shadowing
Does sound travel slower through air or through soft tissue? ✔️air
An increase in transmit power changes what? ✔️acoustic power
What would you change if image does not show adequate penetration in far field and shows noise instead of tissue? ✔️decrease the transmit
frequency because lower frequency penetrates better
What is the range of frequencies for human hearing? ✔️20Hz - 20,000Hz
Maximum cyclical change in quantity is known as? ✔️amplitude
Bulk modulus is closely related to? ✔️stiffness
Time it takes for one ? ✔️period
If number of cycles in a pulse is increased but wavelength remains the same, what changes? ✔️pulse duration
Which transducer would you use for a large patient that would have the least amount of signal attenuation? ✔️lower frequency - goes deeper
Speed of ultrasound in bone? ✔️4080 m/s
Speed of sound is defined as? ✔️speed at which sound propagates through a medium
Longitudinal wave is characterized by? ✔️it travels in one direction
What regions of a wave show decreased particle density in a medium? ✔️rarefaction
Terms used to describe the strength of a sound beam? ✔️amplitude,
intensity
Ultrasound propagation velocity depends on? ✔️density and compressibility (stiffness)
The frequency of the transmission signal is determined by? ✔️the frequency of the electric signal applied to the transducer
When you adjust PRF, you are changing what? ✔️the number of pulses per second
Time it takes for one pulse to occur is known as? ✔️pulse duration
