Artifacts physics 1 Flashcards
Brightened echos that occur in the region of the echo is called what?
Focal enhancement
What causes reverberation artifact
2 strong reflections
Doppler mirror occurs for a Doppler of what angle?
90 degrees
Artifactual fill in on images of anechoic spheres may be attributed to ______
Slice Thickness
The reflector is at the depth if 10cm and the scanner displays the echo of this reflector at 9cm, thi most likely means that the speed is _____
Faster
A c=scan is done on a rotator cuff, what kind of scan will be done-what artifact will result from this scan
Anisotrophy
What artifact produces an image with an incorrect number of reflectors
Side lobes
What artifact displaces structures axially
Speed error or axial
What is the best way to eliminate aliasing?
Increase scale
Enhancement of echos result from structures having a _____ attenuation than the surrounding structures?
Lower
A ______ PRF causes Doppler range ambiguity
High
Biopsy needle
Speed error
What artifact happens a lot in the bladder or gallbladder?
Slice thickness
Refraction displaces structures _______
Laterally
What misrepresents structures?
Acoustic speckle
If the prop speed that exists over a path traveled is 1.44mm/us, the display will place the echo ________from the trx
Further
Refraction occurs because of the differences of _____ between two media
Speed
Can refraction be cause shadowing
Yes
True or false
Is beam width parallel to the scan plane causes partial volume artifact
False
True or false
An increase in SOS in tissue will increase the shadowing affect
False
True or false
Some artifacts are produced by improper equipment settings?
True
What is the primary disadvantage to using CW Doppler?
Range Ambiguity
Brightened echos that occur in the region of focus is called what
Focal enhancement
What causes reverb artifact
2 strong echos
