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Updated: Nov 25, 2025
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Diffusion tensor imaging analysis in scrub typhus meningoencephalitis to determine the alteration of microstructural
Pranjal Phukan1, Kalyan Sarma2, Aman Yusuf Khan1
1Department of Radiology and Imaging, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, India.
Background And Purpose:
Magnetic resonance imaging (MRI) of the brain in scrub typhus meningoencephalitis is non-specific, and in the majority of the cases, conventional MRI fails to detect any abnormality. However, autopsy reports depict central nervous system involvement in almost all patients. There is therefore a need for research on the quantitative assessment of brain parenchyma that can detect microstructural abnormalities. The study aimed to assess the microstructural integrity changes of scrub typhus meningoencephalitis by using different diffusion tensor imaging (DTI) parameters.
Methods:
This was a retrospective analysis of scrub typhus meningoencephalitis. Seven patients and seven age- and sex-matched healthy controls were included. Different DTI parameters such as apparent diffusion coefficient (ADC), fractional anisotropy (FA), relative anisotropy (RA), trace, volume ratio (VR) and geodesic anisotropy (GA) were obtained from six different regions of subcortical white matter at the level of the centrum semiovale. Intergroup significant difference was determined by one-way analysis of variance followed by Tukey's post hoc test. Receiver operating characteristic curves were constructed to determine the accuracy of the DTI matrices.
Results:
There was a significant decrease in FA, RA and GA as well as an increase in ADC and VR in the subcortical white matter in patients with scrub typhus meningoencephalitis compared to controls (p < 0.001). The maximum sensitivity of the DTI parameters was 85.7%, and the maximum specificity was 81%.
Conclusion:
There was an alteration of subcortical white-matter integrity in scrub typhus meningoencephalitis that represents the axonal degeneration, myelin breakdown and neuronal degeneration. DTI may be a useful tool to detect white-matter abnormalities in scrub typhus meningoencephalitis in clinical practice, particularly in patients with negative conventional MRI.
Insights
Diffusion Tensor Imaging (DTI) reveals microstructural brain changes in scrub typhus meningoencephalitis, detecting abnormalities missed by conventional MRI. This quantitative assessment aids in diagnosing central nervous system involvement in affected patients.
Area of Science:
- Neuroimaging
- Neurology
- Infectious Diseases
Background:
- Conventional MRI often fails to detect brain abnormalities in scrub typhus meningoencephalitis.
- Autopsy studies confirm significant central nervous system involvement in most cases.
- Quantitative assessment of brain parenchyma is needed to detect microstructural abnormalities.
Purpose of the Study:
- To assess microstructural integrity changes in the brain of patients with scrub typhus meningoencephalitis.
- To utilize Diffusion Tensor Imaging (DTI) parameters for quantitative analysis.
- To investigate alterations in subcortical white matter integrity.
Main Methods:
- Retrospective analysis of seven scrub typhus meningoencephalitis patients and seven healthy controls.
- Acquisition of DTI parameters including ADC, FA, RA, VR, and GA from subcortical white matter.
- Statistical analysis using ANOVA and Tukey's post hoc test, with ROC curve analysis for diagnostic accuracy.
Main Results:
- Significant decrease in FA, RA, and GA, and increase in ADC and VR in patients compared to controls (p < 0.001).
- DTI parameters demonstrated a maximum sensitivity of 85.7% and specificity of 81%.
- Alterations were observed in the subcortical white matter regions.
Conclusions:
- Scrub typhus meningoencephalitis causes alterations in subcortical white matter integrity, indicative of axonal and myelin degeneration.
- DTI is a valuable tool for detecting white matter abnormalities in scrub typhus meningoencephalitis.
- DTI can aid in clinical diagnosis, especially when conventional MRI shows no abnormalities.
