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Multiple sclerosis lesions: relationship between MR enhancement pattern and magnetization transfer effect
J R Petrella1, R I Grossman, J C McGowan
1Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104, USA.
Purpose:
To investigate the relationship between the enhancement pattern of a multiple sclerosis lesion and its magnetization transfer effect.
Methods:
Fifty-four lesions were chosen from 29 patients with multiple sclerosis on the basis of enhancement pattern on contrast-enhanced T1-weighted MR images. They included 14 homogeneously enhancing lesions, 26 nonenhancing lesions, and 14 ring-enhancing lesions. Magnetization transfer ratios of the homogeneously enhancing lesions, nonenhancing lesions, and central portion of the ring-enhancing lesions were measured. Means were calculated and compared.
Results:
The magnetization transfer ratios for homogeneously enhancing lesions were higher (mean, 32.2%; SD, 3.4%) than those for nonenhancing lesions (mean 29.4%; SD, 4.3%) and for the central portion of ring-enhancing lesions (mean, 24.5%; SD, 4.0%). Significant differences were found between the ring-enhancing lesions and the homogeneously enhancing lesions and between the ring-enhancing lesions and the nonenhancing lesions.
Conclusion:
We found a relationship between decreased magnetization transfer ratios and those enhancement patterns in which myelin is known to be decreased histopathologically. Thus, use of the magnetization transfer technique may increase the specificity of MR imaging in assessing the extent of residual myelination in multiple sclerosis lesions.
Insights
Magnetization transfer ratios in multiple sclerosis lesions correlate with enhancement patterns. Decreased ratios indicate reduced myelination, improving MRI specificity for assessing lesion extent.
Area of Science:
- Neuroimaging
- Radiology
- Biomedical Engineering
Background:
- Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
- Magnetic Resonance Imaging (MRI) is crucial for diagnosing and monitoring MS.
- Understanding lesion characteristics is key to assessing disease progression.
Purpose of the Study:
- To explore the link between the enhancement pattern of MS lesions and their magnetization transfer (MT) effect.
- To determine if MT ratios can differentiate lesion types based on enhancement.
Main Methods:
- Analysis of 54 MS lesions from 29 patients using contrast-enhanced T1-weighted MRI.
- Categorization of lesions into homogeneously enhancing, nonenhancing, and ring-enhancing groups.
- Measurement of Magnetization Transfer Ratios (MTR) in different lesion types.
Main Results:
- Homogeneously enhancing lesions showed higher MTR (32.2%) compared to nonenhancing (29.4%) and ring-enhancing (24.5%) lesions.
- Significant differences in MTR were observed between ring-enhancing and other lesion types.
- Lower MTR correlated with enhancement patterns associated with decreased myelin.
Conclusions:
- A correlation exists between decreased MTR and MS lesion enhancement patterns indicating myelin loss.
- MT imaging may enhance MRI specificity in evaluating residual myelination in MS lesions.
- MT technique offers potential for more precise assessment of MS lesion pathology.