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Novel advanced imaging techniques for cerebral oedema.

Jenny Pham1, Felix C Ng2,3,4

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Cerebral edema after ischemic stroke impacts outcomes. Advanced imaging techniques offer early, sensitive quantification of edema, improving prediction of clinical outcomes beyond traditional CT scans.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Cerebral edema following acute ischemic infarction is linked to poor functional outcomes and malignant progression.
  • Current CT indicators like midline shift and herniation assessment lack sensitivity for early or small infarcts.
  • Diffusion-weighted (DWI) and T2-weighted MRI are sensitive but less accessible for early detection.

Purpose of the Study:

  • To review current and emerging advanced imaging techniques for quantifying cerebral edema.
  • To explore the role of these techniques in predicting clinical outcomes after ischemic stroke.
  • To highlight the need for early and sensitive biomarkers of cerebral edema.

Main Methods:

  • Discussion of established imaging biomarkers (midline shift, herniation).
  • Review of novel imaging biomarkers based on neuroanatomical shift (relative hemispheric volume, CSF displacement).
  • Exploration of advanced imaging biometrics reflecting intrinsic tissue changes (net water uptake, T2 relaxometry, BBB permeability).

Main Results:

  • Novel biomarkers show promise for early and sensitive quantification of cerebral edema.
  • Measures of neuroanatomical shift correlate with poor outcomes.
  • Intrinsic tissue change biomarkers reflect fluid influx into ischemic regions.

Conclusions:

  • Advanced imaging techniques offer superior sensitivity and earlier detection of cerebral edema compared to conventional CT.
  • Quantification of cerebral edema using novel biomarkers is crucial for predicting clinical outcomes in acute ischemic stroke.
  • Further research into these advanced techniques will refine prognostic capabilities.