Review 1 Flashcards
Isoechoic
describes structures with equal echo brightness
Hyperechoic
parts of the image that are brighter than surrounding tissues
tissues that appear brighter than normal
Hypoechoic
parts of an image that are not as bright as surrounding tissues
tissues that appear less bright than normal
directly proportional
when one item increases, the other increases
examples:
clothing size to weight
smoking and chances of developing cardiovascular disease
amplitude and power
Anechoic
entirely without echoes
an extreme form of hypoechoic
Homogenous
part of tissue or image that has similar echo characteristics throughout
heterogenous
part of tissue or image that has differing echo characteristics throughout
mechanical wave
wave that travels through a medium (ultrasound)
electromagnetic wave
wave that can travel through space
Can ultrasound waves travel through space?
No, they are mechanical waves
refraction
change in direction of wave propagation when traveling from one medium to another
(the sound wave bends)
reflection
a portion of the wave’s energy is redirected back to the sound source when it strikes a boundary
frame rate
determined by:
speed of sound in the medium
imaging depth
units: measured in hertz(Hz) or per second = images per second(frames per second)
what type of PZT elements are found in the transducer, man-made or natural?
man-made
example of naturally occuring-quartz
bioeffects
the effects of the sound wave to the biological tissue through which it passes
any damage to tissue
