Artifacts physics 1 Flashcards

1
Q

Brightened echos that occur in the region of the echo is called what?

A

Focal enhancement

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2
Q

What causes reverberation artifact

A

2 strong reflections

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3
Q

Doppler mirror occurs for a Doppler of what angle?

A

90 degrees

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4
Q

Artifactual fill in on images of anechoic spheres may be attributed to ______

A

Slice Thickness

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5
Q

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 _____

A

Faster

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6
Q

A c=scan is done on a rotator cuff, what kind of scan will be done-what artifact will result from this scan

A

Anisotrophy

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7
Q

What artifact produces an image with an incorrect number of reflectors

A

Side lobes

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8
Q

What artifact displaces structures axially

A

Speed error or axial

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9
Q

What is the best way to eliminate aliasing?

A

Increase scale

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10
Q

Enhancement of echos result from structures having a _____ attenuation than the surrounding structures?

A

Lower

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11
Q

A ______ PRF causes Doppler range ambiguity

A

High

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12
Q

Biopsy needle

A

Speed error

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13
Q

What artifact happens a lot in the bladder or gallbladder?

A

Slice thickness

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14
Q

Refraction displaces structures _______

A

Laterally

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15
Q

What misrepresents structures?

A

Acoustic speckle

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16
Q

If the prop speed that exists over a path traveled is 1.44mm/us, the display will place the echo ________from the trx

A

Further

17
Q

Refraction occurs because of the differences of _____ between two media

A

Speed

18
Q

Can refraction be cause shadowing

A

Yes

19
Q

True or false
Is beam width parallel to the scan plane causes partial volume artifact

A

False

20
Q

True or false
An increase in SOS in tissue will increase the shadowing affect

A

False

21
Q

True or false
Some artifacts are produced by improper equipment settings?

A

True

22
Q

What is the primary disadvantage to using CW Doppler?

A

Range Ambiguity

23
Q

Brightened echos that occur in the region of focus is called what

A

Focal enhancement

24
Q

What causes reverb artifact

A

2 strong echos

25
Q
A