Microvascular Abnormality in Relapsing-Remitting Multiple Sclerosis: Perfusion MR Imaging Findings in Normal-appearing White Matter

Radiology ◽  
2004 ◽  
Vol 231 (3) ◽  
pp. 645-652 ◽  
Author(s):  
Meng Law ◽  
Amit M. Saindane ◽  
Yulin Ge ◽  
James S. Babb ◽  
Glyn Johnson ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
White Matter ◽  
Mr Imaging ◽  
Imaging Findings ◽  
Normal Appearing White Matter ◽  
Relapsing Remitting ◽  
Perfusion Mr ◽  
Perfusion Mr Imaging ◽  
Relapsing Remitting Multiple Sclerosis ◽  
Microvascular Abnormality

TI-relaxation time changes over five years in relapsing-remitting multiple sclerosis

2010 ◽  
Vol 16 (4) ◽  
pp. 427-433 ◽  
Author(s):  
Konstantinos Papadopoulos ◽  
Daniel J Tozer ◽  
Leonora Fisniku ◽  
Daniel R Altmann ◽  
Gerard Davies ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Relaxation Time ◽  
White Matter ◽  
Grey Matter ◽  
T1 Relaxation Time ◽  
Normal Appearing White Matter ◽  
T1 Relaxation ◽  
Relapsing Remitting ◽  
Remitting Multiple Sclerosis ◽  
Relapsing Remitting Multiple Sclerosis

The pathological effects of multiple sclerosis are not confined to lesions; tissues that appear normal on conventional magnetic resonance imaging scans are also affected, albeit subtly. One imaging technique that has proven sensitive to such effects is T1-relaxation time measurement, with previous work demonstrating abnormalities in normal-appearing white matter and grey matter. In this work we investigated the evolution of T1-relaxation time changes in normal-appearing white matter and grey matter in relapsing—remitting multiple sclerosis. Three- and five-year follow-up data from 35 people with clinically early (a mean of 1.6 years from first clinical event) relapsing—remitting multiple sclerosis and 15 healthy controls were analysed. T1-relaxation time histograms were extracted from normal-appearing white matter and grey matter, and mean, peak height and peak location values were estimated. T1-relaxation time peak height declined in the multiple sclerosis normal-appearing white matter and grey matter, but not the control group (rate difference p = 0.024 in normal-appearing white matter, in normal-appearing grey matter p = 0.038); other T1-relaxation time changes were not significantly different between groups. Changes in T1-relaxation time measures did not correlate with increases in brain T2-weighted lesion loads or Expanded Disability Status Scale scores. These results suggest that the processes underlying changes in normal-appearing white matter and grey matter T1-relaxation times are not immediately linked to white matter lesion formation, and may represent more diffuse but progressive sub-clinical pathology in relapsing—remitting multiple sclerosis.

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