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biological interaction of ultrasound (AARSRA)

refers to the reduction in beam intensity with depth in tissue carried by absorption scattering and beam divergence

occurs exponentially in much the same manner as that for x-ray radiation

principle of ultrasound attenuationppenetriiaves sound

decrease in a wave's intensity resulting from ___

absorption and frequency

penetration and absorption

penetration and frequency

tissues high water content =

tissues high protein content =

occurs when energy in the sound beam is captured by the tissue

it is the redirection of a portion of the ultrasound beam each towards its source

it occurs when a wave strikes an object and is bounced off in different direction

waves that strikes an object

waves that bounce off an object

property of ultrasound that is most responsible for reflection

occurs when the beam encounters and interface that is irregular and smaller than the source beam

it occurs when diagnostic ultrasound encounters a highly irregular or rough surface or heterogeneous tissue such as kidney and liver

multiple scattering causes _ and _ of ultrasound beam

highly irregular interfaces and heterogeneous tissues result in _

sounds scattered back to the transducer and contributed to image formation

it allows for imaging of organ interfaces that are not perpendicular to the transducer face

is used to describe the reflection of sound at an interface

principle of acoustic impedance

deviation of the beam, bending of waves

determines amount of ultrasound energy reflected at tissue interfaces

as ultrasound energy is reflected at tissue interfaces with different impedances, intensity is increased creating a _

absorption of ultrasound energy occurs in the conducting medication because of interactions _

the time required for the molecule to fall back following displacement

multiple echoes, sound is made up of several beams of sound waves.