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Semin Musculoskelet Radiol 2024; 28(01): 092-102
DOI: 10.1055/s-0043-1776427
Review Article

Imaging Biomarkers of Peripheral Nerves: Focus on Magnetic Resonance Neurography and Ultrasonography

Alireza Eajazi 
1   Department of Radiology, UT Southwestern Medical Center, Dallas, Texas
,
Cindy Weinschenk
1   Department of Radiology, UT Southwestern Medical Center, Dallas, Texas
,
Avneesh Chhabra
1   Department of Radiology, UT Southwestern Medical Center, Dallas, Texas
2   Department of Radiology & Orthopedic Surgery, UT Southwestern Medical Center, Dallas, Texas
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Abstract

Peripheral neuropathy is a prevalent and debilitating condition affecting millions of individuals globally. Magnetic resonance neurography (MRN) and ultrasonography (US) are noninvasive methods offering comprehensive visualization of peripheral nerves, using anatomical and functional imaging biomarkers to ensure accurate evaluation. For optimized MRN, superior and high-resolution two-dimensional and three-dimensional imaging protocols are essential. The anatomical MRN and US imaging markers include quantitative measures of nerve and fascicular size and signal, and qualitative markers of course and morphology. Among them, quantitative markers of T2-signal intensity ratio are sensitive to nerve edema-like signal changes, and the T1-mapping technique reveals nerve and muscle tissue fatty and fibrous compositional alterations.

The functional markers are derived from physiologic properties of nerves, such as diffusion characteristics or blood flow. They include apparent diffusion coefficient from diffusion-weighted imaging and fractional anisotropy and tractography from diffusion tensor imaging to delve into peripheral nerve microstructure and integrity. Peripheral nerve perfusion using dynamic contrast-enhanced magnetic resonance imaging estimates perfusion parameters, offering insights into nerve health and neuropathies involving edema, inflammation, demyelination, and microvascular alterations in conditions like type 2 diabetes, linking nerve conduction pathophysiology to vascular permeability alterations.

Imaging biomarkers thus play a pivotal role in the diagnosis, prognosis, and monitoring of nerve pathologies, thereby ensuring comprehensive assessment and elevating patient care. These biomarkers provide valuable insights into nerve structure, function, and pathophysiology, contributing to the accurate diagnosis and management planning for peripheral neuropathy.

Keywords

peripheral neuropathy - magnetic resonance neurography - T2-signal intensity ratio - diffusion-weighted imaging - diffusion tensor imaging

Financial Disclosures

Alireza Eajazi is a consultant for ICON Medical and TREACE Medical Concepts. He receives book royalties from Jaypee and Wolters, is a medical adviser for ImageBiopsy Lab, and receives research grants from ImageBiopsy Lab and Qure AI.




Publication History

Article published online:
08 February 2024

© 2024. Thieme. All rights reserved.

Thieme Medical Publishers, Inc.
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