Week 4.1 Diagnostic Ultrasound Flashcards
US imaging uses frequency of
over 20,000 Hz
what are the two categories of US imaging
therapeutic (heating for treatment)
Diagnostic (imaging)
what are the 3 challenges to sonography
image generation
image recognition
image interpretation
expand on the limitation of image generation
the principles of sound wave generation and the effects of tissue density makes it hard to get an image, and poor quality.
expand on the limitation of image recognition
planes of view and anatomy are hard to tell from US imaging
How is a sound wave propagated
the sound waves are absorbed, reflected, scattered and then attenuated (returned to the sound head)
how is the penetration and resolution of of a high frequency sonography
poor penetration but high resolution
how is the penetration and resolution of of a low frequency sonography
poor resolution and high penetration
what does anechoic mean
structures without internal reflectors, so no echo are returned. This is seen as black, like fluid
what is hypo-echoic
low level echo, that look grey, like muscles, synovial tissues, peripheral nerves
what is hyper-echoic
high level echo, like bright white and grey, meaning bone, tendons and fascia
which presents a greater risk, therapeutic or diagnostic imaging
therapeutic, because there is higher intensity, and higher risk associated with heating the tissues
TF: there are no biological effects on patients caused by exposure to present diagnostic US
true
what are the benefits of diagnostic US
inexpensive, non-invasive, safe, real-time, in office, bilateral examination and dynamic examination
what are the drawbacks of diagnostic US
operator dependent and
availability
