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The assessment of mild encephalopathy with a reversible splenial lesion (MERS) using high b-value DWI
Bimei Zhuang1, Chenkun Han2, Zhipeng Hua3
1Department of Neuroradiology.
Introduction:
Mild encephalitis/encephalopathy with a reversible splenial lesion (MERS) was shown to have a transient reduction in diffusion. Such changes would be used as an early detection to reduce excessive treatments and promote recovery without sequelae. The current research evaluated the high b-value (b = 3000 s/mm) diffusion-weighted imaging (DWI) assessment in MERS.
Methods:
Sixteen pediatric patients showed MERS used DWI (b = 1000 and 3000 s/mm). To record number of lesions, the signal intensities, signal-to-noise ratios (SNRs), contrast-to-noise ratios (CNRs), contrast ratios (CRs), the apparent diffusion coefficients (ADCs) were measured in the normal parenchyma and lesions.
Results:
Lesions were more apparent with high b-value. The ADC values and CNR in the lesions and surrounding normal brain parenchyma were relatively low at a high compared to standard b-value DWI (SNR: 144.67 ± 33.03, 85.72 ± 31.50; CNR: 20.82 ± 17.64, 49.62 ± 33.06; for b = 1000 and 3000 s/mm). The CR was significantly higher at a high compared to low b-value DWI (CR: 0.06 ± 0.07 versus 0.40 ± 0.14).
Conclusion:
High b-value DWI could detect more lesions and could obviously improve the detection of lesions in pediatric patients with MERS.
Insights
High b-value diffusion-weighted imaging (DWI) enhances lesion detection in pediatric Mild Encephalitis/Encephalopathy with a Reversible Splenial Lesion (MERS). This advanced technique improves early diagnosis, aiding in reduced treatment and better patient recovery.
Area of Science:
- Radiology
- Neuroimaging
- Pediatric Neurology
Background:
- Mild Encephalitis/Encephalopathy with a Reversible Splenial Lesion (MERS) is characterized by transient diffusion changes in the brain.
- Early detection of MERS lesions is crucial for optimizing treatment and preventing long-term neurological deficits.
- Diffusion-weighted imaging (DWI) is a key technique for visualizing these changes.
Purpose of the Study:
- To evaluate the efficacy of high b-value (3000 s/mm²) DWI in detecting MERS lesions in pediatric patients.
- To compare the diagnostic performance of high b-value DWI with standard b-value DWI for MERS.
- To assess imaging parameters such as signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and contrast ratio (CR).
Main Methods:
- A cohort of sixteen pediatric patients diagnosed with MERS was included in the study.
- Diffusion-weighted imaging (DWI) was performed using both standard (b=1000 s/mm²) and high (b=3000 s/mm²) b-values.
- Quantitative analysis involved measuring lesion and normal parenchyma signal intensities, SNRs, CNRs, CRs, and apparent diffusion coefficients (ADCs).
Main Results:
- High b-value DWI demonstrated increased conspicuity of MERS lesions compared to standard b-value DWI.
- Lower ADC values and CNR were observed in lesions and surrounding parenchyma at high b-value compared to standard b-value.
- A significantly higher contrast ratio (CR) was achieved with high b-value DWI, indicating improved lesion visualization.
Conclusions:
- High b-value DWI significantly enhances the detection of MERS lesions in pediatric patients.
- This advanced imaging technique offers superior visualization, potentially leading to earlier and more accurate diagnoses.
- Improved lesion detection with high b-value DWI can guide treatment decisions and improve patient outcomes.
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