SPI Review Questions – Davies 2026 – Security Principles and Information
Systems Practice Guide
Will not cause a redirection of part of the ultrasound energy - correct answer ✔✔ absorption
You are scanning a large mass composed primarily of fat. What will you most likely encounter? -
correct answer ✔✔ 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? - correct answer ✔✔
oblique incidence and
change in propagation speed
What may be detected with refraction? - correct answer ✔✔ lateral misregistration
Of the following structures, which is the most attenuating: blood, bile, lung tissue, calcification?
- correct answer ✔✔ calcifications - leaves a shadow
What can you do to enhance the visibility of specular reflectors? - correct answer ✔✔
perpendicular incidence
What tissue/sound interaction is primarily responsible for imaging internal structures of organs?
- correct answer ✔✔ scattering
What tissue/sound interaction is necessary for an ultrasound image? - correct answer ✔✔
reflection
For soft tissues, what is needed for determining what a specific impedance is? - correct answer
✔✔ bulk modulus and interface
, You are imaging a structure that is highly attenuating. What imaging artifact would you expect
to encounter? - correct answer ✔✔ shadowing
Does sound travel slower through air or through soft tissue? - correct answer ✔✔ air
An increase in transmit power changes what? - correct answer ✔✔ acoustic power
What would you change if image does not show adequate penetration in far field and shows
noise instead of tissue? - correct answer ✔✔ decrease the transmit frequency because lower
frequency penetrates better
What is the range of frequencies for human hearing? - correct answer ✔✔ 20Hz - 20,000Hz
Maximum cyclical change in quantity is known as? - correct answer ✔✔ amplitude
Bulk modulus is closely related to? - correct answer ✔✔ stiffness
Time it takes for one ? - correct answer ✔✔ period
If number of cycles in a pulse is increased but wavelength remains the same, what changes? -
correct answer ✔✔ pulse duration
Which transducer would you use for a large patient that would have the least amount of signal
attenuation? - correct answer ✔✔ lower frequency - goes deeper
Speed of ultrasound in bone? - correct answer ✔✔ 4080 m/s
Systems Practice Guide
Will not cause a redirection of part of the ultrasound energy - correct answer ✔✔ absorption
You are scanning a large mass composed primarily of fat. What will you most likely encounter? -
correct answer ✔✔ 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? - correct answer ✔✔
oblique incidence and
change in propagation speed
What may be detected with refraction? - correct answer ✔✔ lateral misregistration
Of the following structures, which is the most attenuating: blood, bile, lung tissue, calcification?
- correct answer ✔✔ calcifications - leaves a shadow
What can you do to enhance the visibility of specular reflectors? - correct answer ✔✔
perpendicular incidence
What tissue/sound interaction is primarily responsible for imaging internal structures of organs?
- correct answer ✔✔ scattering
What tissue/sound interaction is necessary for an ultrasound image? - correct answer ✔✔
reflection
For soft tissues, what is needed for determining what a specific impedance is? - correct answer
✔✔ bulk modulus and interface
, You are imaging a structure that is highly attenuating. What imaging artifact would you expect
to encounter? - correct answer ✔✔ shadowing
Does sound travel slower through air or through soft tissue? - correct answer ✔✔ air
An increase in transmit power changes what? - correct answer ✔✔ acoustic power
What would you change if image does not show adequate penetration in far field and shows
noise instead of tissue? - correct answer ✔✔ decrease the transmit frequency because lower
frequency penetrates better
What is the range of frequencies for human hearing? - correct answer ✔✔ 20Hz - 20,000Hz
Maximum cyclical change in quantity is known as? - correct answer ✔✔ amplitude
Bulk modulus is closely related to? - correct answer ✔✔ stiffness
Time it takes for one ? - correct answer ✔✔ period
If number of cycles in a pulse is increased but wavelength remains the same, what changes? -
correct answer ✔✔ pulse duration
Which transducer would you use for a large patient that would have the least amount of signal
attenuation? - correct answer ✔✔ lower frequency - goes deeper
Speed of ultrasound in bone? - correct answer ✔✔ 4080 m/s
