Term
| Perpendicular incidence is also known as: |
|
Definition
|
|
Term
| The term derived from the product of the density and propagation speed of a medium is known as: |
|
Definition
|
|
Term
| The phenomenon that occurs when the beam strikes a small reflector with a diameter of less than the sound wavelength is referred to as: |
|
Definition
|
|
Term
The angle of refraction is equal to the angle of incidence:
TRUE or FALSE |
|
Definition
|
|
Term
| The principle of refraction is known as: |
|
Definition
|
|
Term
| If the propagation speed of sound is greater in the second medium, the transmission angle will: |
|
Definition
|
|
Term
| The factors that contribute to attenuation are: |
|
Definition
Scattering
Reflection
Absorption |
|
|
Term
| As the stiffness of a medium increases the propagation speed: |
|
Definition
|
|
Term
| Which statement about higher frequencies is most correct? |
|
Definition
| Does not affect the propagation speed |
|
|
Term
| The attenuation coefficient for soft tissue is equal to ____ db/cm per MHz of frequency. |
|
Definition
|
|
Term
| Which term is used to describe the interaction of sound with irregular shaped or rough edge structures? |
|
Definition
|
|
Term
| The units for impedance are: |
|
Definition
|
|
Term
| Which condition between two media interfaces would produce the greatest amount of ultrasound reflected back to the transducer. |
|
Definition
| Large impedance difference |
|
|
Term
| In soft-tissue _______ makes imaging less angle dependent. |
|
Definition
|
|
Term
| Refraction often causes a type of artifact known as: |
|
Definition
|
|
Term
| The decibel notation is a convenient way to express the _____ between two intensities. |
|
Definition
|
|
Term
| Approximately what percent of the incident intensity is reflected at a soft tissue-air interface? |
|
Definition
|
|
Term
| What statement is most correct regarding ultrasound absorption? |
|
Definition
| Absorption is the major part of attenuation |
|
|
Term
| The attenuation coefficient is expressed in: |
|
Definition
|
|
Term
| In order for a refracted wave to be produced, which of the following conditions must be met at an interface? |
|
Definition
| Oblique incidence, same sound speeds |
|
|
