Ultrasound Flashcards
Thermal ultrasound is pulsed/continuous
continuous
nonthermal ultrasound is pulsed/continuous
pulsed
1 MHz deep/superficial
deep
3.3 MHz deep/superficial
superficial
attenuation is greatest…
in tissues with high collagen content - ligaments and tendons
with the use of high US frequencies
the ____ the frequency the _____ the penetration of the tissue
lower; greater the depth
a decrease in energy intensity as the ultrasound wave is transmitted through various tissues owing to scattering changes in tissue fluids
attenuation
penetration and absorption are _____ related
inversely
what is the soundhead called?
transducer
the portion of the surface of the transducer that actually produces the sound wave is called the ___
effective radiating area (ERA)
the larger the diameter of the transducer, the more focused or _____ the beam.
collimated
intensity of the US bean averaged over the entire area of the transducer. power output/ERA
spatial averaged intensity
the highest value occurring within the beam over time
spatial peak intensity
Indications for ultrasound
soft tissue healing and repair scar tissue stretching of connective tissue chronic inflammation reduction of muscle spasm bone healing pain modulation increase blood flow soft tissue repair increase in protein synthesis tissue regeneration repair of nonunion fractures myofascial trigger points
contraindications for ultrasound
areas of decreased sensation/circulation vascular insufficiency malignancy pregnancy CNS tissue joint cement/total joint replacement plastic components pacemaker eyes infection epiphyseal plate reproductive organs thrombophlebitis
