Applied Topics: Advanced MRI Biomarkers

This lecture discusses the evolution of magnetic resonance imaging (MRI) in the clinical management of Multiple Sclerosis (MS). It is highlighted that the transition is from conventional MRI, used for diagnosis according to the McDonald criteria, to advanced quantitative techniques that better characterize the underlying pathophysiology of the disease. The lecture emphasizes that while conventional MRI is vital for detecting lesion dissemination and monitoring treatment safety, it often fails to provide specific information about disease progression and differential diagnosis. This lecture explains how new biomarkers, such as the Central Vein Sign (CVS) and Paramagnetic Rim Lesions (PRL), are being integrated into updated diagnostic criteria to reduce misdiagnosis and more accurately predict clinical trajectories.

Learning objectives:
By the end of this lecture, students will be able to:

• Understand the limitations of conventional MRI in MS clinical practice, particularly regarding specificity in differential diagnosis and monitoring disease progression
• Identify advanced radiological biomarkers such as the Central Vein Sign (CVS) and Paramagnetic Rim Lesions (PRL), and understand their roles in the updated McDonald diagnostic criteria
• Distinguish between qualitative and quantitative MRI, recognizing how different bio-physical properties (like T1 relaxation or magnetization transfer) provide indirect measures of tissue integrity
• Evaluate different myelin-sensitive techniques, comparing the sensitivity and specificity of Magnetization Transfer Imaging (MTI), Myelin Water Imaging (MWI), and Diffusion MRI
• Assess the clinical utility of new imaging tools for predicting "progression independent of relapse activity" (PIRA) and monitoring remyelination in clinical trials