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Diffusion tensor imaging in evaluation of posterior fossa tumors in children on a 3T MRI scanner
Zarina Abdul Assis1, Jitender Saini2, Manish Ranjan3
1Department of Radiology, Sri Sathya Sai Institute of Higher Medicial Sciences, Bangalore, Karnataka, India.
Context:
Primary intracranial tumors in children are commonly located in the posterior fossa. Conventional MRI offers limited information regarding the histopathological type of tumor which is essential for better patient management.
Aims:
The purpose of the study was to evaluate the usefulness of advanced MR imaging techniques like diffusion tensor imaging (DTI) in distinguishing the various histopathological types of posterior fossa tumors in children.
Settings And Design:
DTI was performed on a 3T MRI scanner in 34 untreated children found to have posterior fossa lesions.
Materials And Methods:
Using third party software, various DTI parameters [apparent diffusion coefficient (ADC), fractional anisotropy (FA), radial diffusivity, planar index, spherical index, and linear index] were calculated for the lesion.
Statistical Analysis Used:
Data were subjected to statistical analysis [analysis of variance (ANOVA)] using SPSS 15.0 software.
Results:
We observed significant correlation (P < 0.01) between ADC mean and maximum, followed by radial diffusivity (RD) with the histopathological types of the lesions. Rest of the DTI parameters did not show any significant correlation in our study.
Conclusions:
The results of our study support the hypothesis that most cellular tumors and those with greater nuclear area like medulloblastoma would have the lowest ADC values, as compared to less cellular tumors like pilocytic astrocytoma.
Insights
Diffusion tensor imaging (DTI) shows promise in differentiating pediatric posterior fossa tumors. Key DTI parameters like apparent diffusion coefficient (ADC) correlate with tumor cellularity, aiding in diagnosis.
Area of Science:
- Pediatric neuro-oncology
- Advanced neuroimaging techniques
- Biomedical engineering
Background:
- Posterior fossa tumors are common in children.
- Conventional MRI has limitations in determining tumor histology.
- Accurate histopathological diagnosis is crucial for pediatric brain tumor management.
Purpose of the Study:
- To assess the utility of diffusion tensor imaging (DTI) in differentiating pediatric posterior fossa tumors.
- To explore the correlation between DTI parameters and tumor histopathology.
- To enhance diagnostic accuracy for pediatric brain tumors.
Main Methods:
- Diffusion tensor imaging (DTI) was conducted on 34 children with posterior fossa lesions using a 3T MRI scanner.
- DTI parameters including apparent diffusion coefficient (ADC) and radial diffusivity (RD) were calculated.
- Statistical analysis, including ANOVA, was performed to evaluate correlations.
Main Results:
- Significant correlations were found between ADC values (mean and maximum) and tumor histopathological types.
- Radial diffusivity (RD) also showed a significant correlation with lesion type.
- Other DTI parameters did not demonstrate significant correlations in this cohort.
Conclusions:
- DTI parameters, particularly ADC, can help distinguish between different pediatric posterior fossa tumors.
- Highly cellular tumors like medulloblastoma are expected to have lower ADC values than less cellular tumors like pilocytic astrocytoma.
- DTI offers a valuable non-invasive tool for improving the diagnosis of pediatric posterior fossa tumors.
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