MR Elastography — Measuring Tissue Stiffness (Liver Fibrosis)

MR Elastography

A way to “palpate” an organ from inside the scanner — MRI turns tissue stiffness into a number, most powerfully for staging liver fibrosis without a biopsy.

How it works

A driver placed on the body sends gentle mechanical waves into the tissue. A modified phase-contrast MRI sequence images those waves as they travel, and stiffer tissue transmits them faster/longer — processed into a colour stiffness map (elastogram) in kilopascals.

The principle is quantified palpation: fibrotic liver is stiffer, and MRE measures that objectively across the whole organ, not just a needle-sized sample.

Liver fibrosis

MRE is the most accurate non-invasive test for liver fibrosis staging, widely used in chronic liver disease (MASLD/NASH, viral hepatitis) to detect and monitor fibrosis and reduce the need for biopsy. It is often combined with PDFF (fat) and R2* (iron) in one liver-quantification exam.

Beyond the liver

Research and emerging clinical uses include the spleen (portal hypertension), pancreas, kidney, and the brain (where stiffness changes are being explored in neurodegeneration and tumours). As with all quantitative MRI, values depend on technique and need standardisation.

Reference: Venkatesh SK, Yin M, Ehman RL. Magnetic resonance elastography of liver: technique, analysis, and clinical applications. J Magn Reson Imaging 2013;37:544–55.

Educational summary for clinicians; thresholds are technique-dependent. Not medical advice.