Imaging Techniques for Pediatric Brain Tumors

Summary

Pediatric brain tumours pose unique diagnostic challenges that demand a combination of structural and functional imaging modalities. High-resolution magnetic resonance imaging (MRI) remains the cornerstone for initial evaluation, offering exquisite soft-tissue contrast, multiparametric sequences such as diffusion-weighted imaging and perfusion MRI, and the ability to delineate tumour margins non-invasively. Magnetic resonance spectroscopy further enhances characterisation by probing metabolite profiles within lesions. Advances in positron emission tomography (PET) employing both glucose-based and amino-acid radiotracers have refined metabolic assessment, improving detection of residual disease and recurrence. Hybrid PET/MRI platforms integrate anatomical and functional data, while novel semi-automated image-processing frameworks and radiomic analysis tools are emerging to reduce inter-observer variability and expedite quantitative assessment of tumour burden. Together, these modalities underpin more precise diagnosis, risk stratification and treatment planning, with ongoing efforts aimed at standardising protocols across centres and extending accessibility in diverse healthcare settings.

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Imaging Techniques for Pediatric Brain Tumors publication trend

The graph below shows the total number of articles in imaging techniques for pediatric brain tumors across all publications each year (not limited to Nature Index journals).

Technical terms

Diffusion-weighted imaging (DWI): MRI sequence sensitive to the random motion of water molecules, useful for assessing tumour cellularity.

Perfusion MRI: Technique measuring the passage of contrast agent through cerebral vasculature to estimate blood flow and volume in tumours.

Positron emission tomography (PET): Functional imaging modality that detects gamma rays from radiotracers to map metabolic or molecular activity.

Radiotracer: Radioactive compound administered to visualise specific biological processes, such as glucose uptake or amino-acid transport.

Magnetic resonance spectroscopy (MRS): Non-invasive method to quantify biochemical metabolites within brain tissue, aiding tumour characterisation.

References

  1. Joint EANM/SIOPE/RAPNO practice guidelines/SNMMI procedure standards for imaging of paediatric gliomas using PET with radiolabelled amino acids and [18F]FDG: version 1.0. European Journal of Nuclear Medicine and Molecular Imaging (2022).
  2. A New Tool for Extracting Static and Dynamic Parameters from [18F]F-DOPA PET/CT in Pediatric Gliomas. Journal of Clinical Medicine (2024).
  3. Towards an Automated Approach to the Semi-Quantification of [18F]F-DOPA PET in Pediatric-Type Diffuse Gliomas. Journal of Clinical Medicine (2023).

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