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Types of ultrasound artifacts?

Created: 23/11/2004
 

Two major types

Technique-dependent artifacts:
Noise caused by excess gain

Resolving noise caused by excess gain
- Decrease overall gain

Gain Down


Low signal caused by inappropriate transducer selection or low gain settings

Resolving low gain artifacts:

- Increase overall gain
-
Increase far gain
-
Apply more acoustic coupling gel

Gain Up

 

Inherent sonographic artifacts

Shadowing

Caused by sound striking a strong reflective interface example; areas behind ribs or gall stones

Gallstone

Shadowing corrective technique:
- Scan around object causing shadowing



Enhancement

Caused by sound travelling through fluid-filled structures without attenuation (example: area behind cysts, area behind gallbladder)

Enhancement

Enhancement corrective technique:
- Reduce overall gain
- Decrease far gain



Reverberation

Caused by sound interfacing with two structures of markedly differing acoustic properties;
example: inadequate amount of gel, obstructing bowel gas

Reverberation

Reverberation corrective technique:
- Change angle of transducer
- Apply more gel
- Rotate patient

 

ArticleDate:20041123
SiteSection: Article
 
   
    
                                            
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