Does "stiffness" typically refers to "shear stiffness (Gs)" in Magnetic Resonance Elastography (MRE) or "stiffness" and "shear stiffness (Gs)" are two different things in MRE?
If you see the term "stiffness" in a MRE study, it is likely referring to shear stiffness. If you are unsure, you can always check the study's methods section to see how the term was defined.