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These flashcards cover key concepts related to ultrasound artifacts and interference, including definitions, causes, and reduction techniques.
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What can cause strong electrical interference in ultrasound imaging?
Nearby electrical devices can create interference patterns.
What are common faulty elements that can lead to artifacts?
Piezolelectric crystals can be damaged or breaks in wiring can occur.
What is speckle in ultrasound imaging?
A granular appearance of an image caused by interference of echoes.
How can speckle be reduced?
By using spatial compounding.
What is mirror image artifact and how can it be reduced?
It occurs when echoes encounter a strong reflector acting as a mirror; can be reduced by changing approach.
Define reverberation in ultrasound. What causes it?
It occurs between two strong reflectors where sound waves bounce back and forth, appearing as equally spaced extra reflectors.
What is the difference between comet tail and ring down artifacts?
Comet tail is a small reverberation artifact, while ring down is associated with gas and appears as high amplitude streaks.
What is edge shadowing and how is it caused?
It's a refraction artifact caused by reflection and refraction at the margin of a well-defined object.
What is range ambiguity in ultrasound?
It occurs when echoes from the preceding pulse arrive at the same time as another pulse has been emitted, causing confusion in depth perception.
What is posterior acoustic enhancement?
It appears as a band of increased echogenicity behind an area of low attenuation due to adjacent structures with different attenuation properties.