Artifacts

An artifact is not:

• An incorrect size or shape

• Incorrect position

• Incorrect brightness

• A real structure

What is an assumption of the imaging device that if broken causes an artifact?

• Sound travels exactly 1540 m/s

• Imaging plane is very thin

• Strength if a reflection is related to the characteristics of the tissue

• Sound travels directly to a reflector and back

• All of the above

Which artifact is primarily produced by refraction?

• Posterior enhancement

• Shadowing

• Comet tail

• Refraction

Which adjustment will reduce the artifact in the cystic lesion in image A resulting in image B?

• Turn on harmonics

• Change to a 1.5 D linear transducer

• Decrease gain

• Change imaging plane

Answer explanation

Though all the above could correct the image, harmonics is a way to fix lobe artifact specifically.

What is the best way to fix this image?

• Leave it- it helps characterize the tissue

• TGC adjustment

• Overall gain

• Change angle

How to change the image artifact shown by B?

• Use a 1 D linear transducer

• Decrease output power

• Move focus

• Decrease image depth

What is the artifact shown by the white arrow?

• Speed error

• Mirror image artifact

• Comet tail

• Focal enhancement

How would you adjust this image?

• Use spatial compounding

• Decrease depth

• Use temporal compounding

• Change focal zone

What are the artifacts seen in this image?

• Edge shadow

• Posterior shadowing

• Temporal artifact

• Posterior enhancement

How would you correct this image?

• Change depth

• Decrease gain

• Decrease output power

• Harmonics