Recent developments in imaging of multiple sclerosis.

Area of Science:

• Neuroimaging
• Radiology
• Neurology

Background:

• Conventional magnetic resonance imaging (MRI) revolutionized multiple sclerosis (MS) diagnosis but lacks sensitivity to detect true pathologic changes.
• Standard MRI metrics cannot differentiate between inflammation, edema, demyelination, or axonal loss in MS.
• Emerging nonconventional MRI techniques show greater correlation with MS disability.

Purpose of the Study:

• To summarize advanced MRI metrics for MS assessment.
• To describe the relationship between novel MRI techniques and central nervous system pathology in MS.
• To provide a comprehensive overview of MRI applications in MS patients.

Main Methods:

• Review of various MRI metrics including T1-weighted hypointense lesions, CNS atrophy, magnetization transfer imaging, myelin water fraction, diffusion tensor imaging, magnetic resonance spectroscopy, and susceptibility-weighted imaging.
• Description of the latest MRI techniques and their association with CNS pathology.
• Comprehensive overview of MRI utility in MS patient management.

Main Results:

• Advanced MRI metrics provide insights into pathologic processes linked to MS disease activity and progression.
• Techniques reveal tissue changes like demyelination, axonal loss, iron deposition, and neurodegeneration.
• Evidence of significant occult pathology in normal-appearing white and gray matter in MS patients.

Conclusions:

• Advanced MRI techniques enhance understanding of MS pathology and clinical progression.
• These metrics identify subtle tissue changes and neurodegeneration in MS.
• Lack of standardization currently prevents adoption of advanced MRI techniques into MS imaging guidelines.