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Diffusion MRI in Rasmussen's encephalitis, herpes simplex encephalitis, and bacterial meningoencephalitis
1Department of Radiology, Ege University Hospital, Bornova, 35100, Izmir, Turkey. rnsener@hotmail.com
Abstract:
Three patients with Rasmussen's encephalitis, herpes simplex type 1 encephalitis, and bacterial meningoencephalitis are included in this study. Echo-planar diffusion MRI was acquired with the trace protocol at 1.5 T. b= 1000 s/mm(2) images, and apparent diffusion coefficient (ADC) maps were studied with respect to lesion identification. ADC values were also studied, and compared to those of 25 normals. In Rasmussen's encephalitis b= 1000 s/mm(2) images were uninformative while ADC maps had superior information. In herpes simplex type 1 encephalitis both b= 1000 s/mm(2) images, and ADC maps had diagnostic information. In meningoencephalitis b= 1000 s/mm(2) images had superior information, especially with respect to early cerebritis while ADC maps were negative. In conclusion, diffusion MRI provided useful imaging data on different types of encephalitis, either on b= 1000 s/mm(2) images or on ADC maps, or on both.
Insights
Diffusion MRI aids in diagnosing encephalitis. Apparent diffusion coefficient (ADC) maps and b=1000 images provide valuable information for identifying lesions in various encephalitis types.
Area of Science:
- Radiology
- Neurology
- Medical Imaging
Background:
- Encephalitis presents diagnostic challenges.
- Diffusion MRI offers advanced imaging capabilities for brain tissue evaluation.
Purpose of the Study:
- To evaluate the utility of diffusion MRI, specifically b=1000 images and apparent diffusion coefficient (ADC) maps, in differentiating various types of encephalitis.
- To compare the diagnostic information provided by b=1000 images versus ADC maps in specific encephalitis cases.
Main Methods:
- Acquisition of echo-planar diffusion MRI at 1.5 T using a trace protocol.
- Analysis of b=1000 s/mm(2) images and apparent diffusion coefficient (ADC) maps for lesion identification.
- Comparison of ADC values from three encephalitis patients with 25 healthy controls.
Main Results:
- In Rasmussen's encephalitis, ADC maps were more informative than b=1000 images.
- Herpes simplex type 1 encephalitis showed diagnostic information on both b=1000 images and ADC maps.
- Bacterial meningoencephalitis demonstrated superior information on b=1000 images, particularly for early cerebritis, while ADC maps were negative.
Conclusions:
- Diffusion MRI is a valuable tool for imaging different encephalitis types.
- Both b=1000 images and ADC maps contribute useful diagnostic data, with varying utility depending on the specific encephalitis.
- The study highlights the complementary roles of different diffusion MRI sequences in diagnosing encephalitis.