The ultrasound image below was obtained in the mid-longitudinal plane through the left lobe of the liver.
What is the artifact indicated by the red arrow called?
A. Dirty shadow
B. Edge shadowing
C. Clean acoustic shadow
The artifact is a dirty shadow.
Explanation
An acoustic shadow can be due to absorption or reflection. Gallbladder and renal calculi produce acoustic shadowing that are caused by absorption of the acoustic energy. In this example, the acoustic shadow is being produced by reflection of the acoustic energy as it hits the air in the bowel/stomach. This type of shadow is known as a dirty shadow.
References
1. POCUS Certification Academy. Edge shadowing artifact. Published August 29, 2020. Accessed January 4, 2022. https://www.pocus.org/resources/edge-shadowing-artifact/
Access the full POCUS Learning Library for FREE!
Share a few details so we can tailor new content to your specialty and region.
