Liver steatosis calculator (MRI) - Radiology calculators

Technical notes:

Signal loss on OOP is only apparent if the degree of fatty infiltration is between approximately 10-50%.
In case of >50% fatty infiltration the liver will appear paradoxically less hypointense in OOP than IP!
The above calculator uses the following formula:
- [(Liver IP / Spleen IP) – (Liver OOP / Spleen OOP) ] / [(Liver IP / Spleen IP)] x 100
If the signal intensity is >10% the diagnosis of fatty infiltration is confirmed
- ^{Aliya Qayyum, Michelle Nystrom, Susan M. Noworolski, Philip Chu, Arpan Mohanty, Raphael Merriman. MRI Steatosis Grading: Development and Initial Validation of a Color Mapping System. (2012) American Journal of Roentgenology.}
During placement of regions of interest (ROI) make sure to avoid large vessels, organ boundaries, and any motion-related or other MRI artifacts.

For further information it is recommended to read the Radiopaedia.org article about diffuse hepatic steatosis.

Last updated: 2021-08-15