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Diffusion-weighted MR imaging in Japanese encephalitis.

Mahesh Prakash1, Sunil Kumar, Rakesh K Gupta

  • 1Department of Radiodiagnosis, Sanjay Gandhi Post-Graduate Institute of Medical Sciences, Lucknow-226014, (U.P), India.

Journal of Computer Assisted Tomography
|November 13, 2004
PubMed
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Diffusion-weighted imaging (DWI) aids in the early diagnosis of Japanese encephalitis (JE). DWI also helps characterize lesion duration by analyzing apparent diffusion coefficient (ADC) values, correlating them with disease progression.

Area of Science:

  • Neurology
  • Radiology
  • Infectious Diseases

Background:

  • Japanese encephalitis (JE) is a serious neurological disorder.
  • Early and accurate diagnosis is crucial for patient management and outcomes.

Purpose of the Study:

  • To evaluate the diagnostic utility of diffusion-weighted imaging (DWI) in Japanese encephalitis (JE).
  • To explore the relationship between apparent diffusion coefficient (ADC) values and the duration of JE illness.

Main Methods:

  • Diffusion-weighted imaging (DWI) and T2-weighted (T2W) MRI were performed on fourteen JE patients.
  • Lesion characteristics on DWI and T2W were compared, and patients were grouped based on lesion visibility.
  • Apparent diffusion coefficient (ADC) values of lesions were calculated and correlated with disease duration.

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Main Results:

  • DWI identified characteristic thalamic involvement in JE, aiding early diagnosis.
  • Nine out of fourteen patients showed additional lesions on DWI compared to T2W.
  • ADC values varied between patient groups and showed a significant direct correlation with disease duration (r=0.847, P <0.01).

Conclusions:

  • DWI is a valuable tool for the early diagnosis of Japanese encephalitis.
  • DWI, through ADC value analysis, can help characterize the duration of JE lesions.