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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Updated: Feb 25, 2026

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
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Voxel-based magnetic resonance image postprocessing in epilepsy.

Pascal Martin1, Gavin P Winston2,3, Philippa Bartlett2,3

  • 1Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.

Epilepsia
|July 27, 2017
PubMed
Summary
This summary is machine-generated.

Voxel-based morphometry (VBM) methods for detecting focal cortical dysplasia in epilepsy show varied diagnostic performance. Normalized fluid-attenuated inversion recovery (nFSI) maps offer better postsurgical outcome prediction in MRI-negative patients.

Keywords:
EpilepsyMRIMRI negativePostprocessingVoxel-based

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Quantitative MRI

Background:

  • Voxel-based processing of structural MRI aids in detecting occult lesions in focal epilepsy.
  • Existing studies show variability in methods, making it unclear which processing approach is optimal.

Purpose of the Study:

  • To compare the efficacy of common voxel-based morphometry (VBM) methods in detecting epileptogenic lesions.
  • To evaluate the diagnostic yield of these methods in MRI-positive and MRI-negative epilepsy patients.
  • To assess the postsurgical outcome prediction capabilities of different VBM techniques.

Main Methods:

  • Analyzed 144 presurgical focal epilepsy patients (15 MRI-positive, 129 MRI-negative).
  • Applied four VBM methods: gray matter volume, gray matter concentration, junction map (JM) on T1 images, and normalized fluid-attenuated inversion recovery (nFSI).
  • Determined specificity using 50 healthy controls.

Main Results:

  • All VBM maps demonstrated detection rates >30% (strict threshold) and >60% (liberal threshold) for focal cortical dysplasia, except gray matter volume.
  • Except for nFSI, most maps exhibited poor specificity with high false-positive rates in controls.
  • nFSI showed a significant positive odds ratio (7.33) for favorable postsurgical outcomes in MRI-negative patients.

Conclusions:

  • Different VBM variants possess distinct diagnostic properties crucial for accurate interpretation.
  • Structural postprocessing is valuable in presurgical epilepsy diagnostics, but low specificity of certain methods requires careful consideration.