Quiz 3

Image 1

Questions:

1. Name the ultrasound artefact shown.
2. Briefly describe why it occurs.
3. State how to rectify this.

Answers:

1. Reverberation artefact.
2. Reverberation artefact occurs when ultrasound beam encounter strong parallel reflectors causing sound beam to reflects back and forth.
3. It can be rectified by reducing the TGC of near gain or move the position of transducer/change beam angle

Image 2

Questions:

1. Name the ultrasound artefact shown.
2. Briefly describe why it occurs.

Answers:

1. Edge shadowing artefact.
2. Edge shadow is produced when a sound wave is refracted (bent) at the edge of strongly curved structure

Image 3

Questions:

1. Name the ultrasound artefact shown.
2. Briefly describe why it occurs.

Answers:

1. Acoustic shadowing artefact.
2. Acoustic shadowing is signal void behind structures that strongly absorb or reflect ultrasound waves such as calculus in this case gall bladder calculus

Image 4

Questions:

1. Name the ultrasound artefact shown.
2. Briefly describe why it occurs.

Answers:

1. Acoustic enhancement artefact.
2. Acoustic enhancement occurs due to increased echoes transmission deep to the structures that transmit sounds exceptionally well (fluid), in this case a simple breast cyst.