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Updated: May 26, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Longitudinal magnetization transfer imaging in mild to severe Alzheimer disease
S Ropele1, R Schmidt, C Enzinger
1Department of Neurology, Medical University of Graz, Graz, Austria. stefan.ropele@medunigraz.at
Background And Purpose:
MTI has been proposed as a sensitive technique for studying microstructural brain tissue changes in patients with AD, but the course of these changes over time is largely unknown. We therefore used a placebo-controlled study of memantine to follow the evolution of tissue damage in AD by means of MTR measurements and investigated how MTR changes were related to brain atrophy and cognition.
Materials And Methods:
Twenty-eight patients (76.5 ± 5.8 years) with mild to moderate AD underwent MTI, brain volume measurements, and cognitive testing at baseline and after 6 and 12 months. Nineteen healthy individuals (73.3 ± 3.2 years) served as controls. MTI was performed with a 2-minute protocol that was optimized for an enhanced MT effect and reduced motion sensitivity. Global and regional MTR measurements served as correlations with brain volumes and the MMSE score.
Results:
AD patients had significantly lower global MTR values than controls, and showed a consistent and significant MTR reduction in all regions investigated over a period of 12 months. These MTR changes were paralleled by a brain tissue loss of 2.2% per year. Associations between MTR and cognition were found for the hippocampus, putamen, and thalamus, and were more pronounced in the left hemisphere.
Conclusions:
MTI in AD allows the assessment of ongoing global and regional brain damage independent of atrophy, and therefore appears to be a valuable marker for disease-related tissue changes.
Insights
Magnetization Transfer Imaging (MTI) reveals ongoing brain tissue damage in Alzheimer's disease (AD) patients over 12 months. MTI changes correlate with brain atrophy and cognitive decline, offering a valuable marker for disease progression.
Area of Science:
- Neuroimaging
- Alzheimer's Disease Research
- Biomarker Development
Background:
- Alzheimer's disease (AD) is characterized by progressive neurodegeneration.
- Microstructural brain tissue changes are key in AD pathology.
- The longitudinal course of these changes is not well understood.
Purpose of the Study:
- To investigate the evolution of brain tissue damage in AD using Magnetization Transfer Imaging (MTI).
- To assess the relationship between MTI changes, brain atrophy, and cognitive function over 12 months.
- To evaluate MTI as a sensitive marker for AD progression.
Main Methods:
- A 12-month placebo-controlled study involving 28 AD patients and 19 healthy controls.
- Utilized Magnetization Transfer Imaging (MTI) with an optimized 2-minute protocol.
- Performed global and regional MTR measurements, brain volume analysis, and cognitive testing (MMSE).
Main Results:
- AD patients exhibited significantly lower global MTR values compared to controls.
- Consistent MTR reduction observed across all investigated regions over 12 months, paralleling 2.2% annual brain tissue loss.
- Significant associations found between MTR and cognition in the hippocampus, putamen, and thalamus, particularly in the left hemisphere.
Conclusions:
- MTI effectively assesses ongoing global and regional brain damage in AD, independent of atrophy.
- MTI serves as a valuable tool for monitoring disease-related tissue changes in Alzheimer's disease.
- This technique holds promise for tracking AD progression and treatment effects.
