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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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Susceptibility changes in meningiomas influence the apparent diffusion coefficient in diffusion-weighted MRI.

L Schwyzer1, J Berberat2, L Remonda2

  • 1Department of Neurosurgery/Brain Tumor Center, Cantonal Hospital Aarau, Tellstrasse, 5001 Aarau, Switzerland.

Journal of Neuroradiology = Journal De Neuroradiologie
|September 28, 2015
PubMed
Summary
This summary is machine-generated.

Susceptibility changes in meningiomas significantly increase apparent diffusion coefficient (ADC) values, impacting diffusion-weighted MRI (DWI) interpretations. This finding is crucial for understanding tumor behavior and requires consideration in clinical assessments.

Keywords:
Apparent diffusion coefficientDiffusion MRIMeningiomaSusceptibility changes

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Area of Science:

  • Neuroimaging
  • Radiology
  • Oncology

Background:

  • Meningiomas can exhibit hemorrhage and calcification, detectable by susceptibility-weighted MRI (SWI).
  • Diffusivity, measured by apparent diffusion coefficient (ADC) using diffusion-weighted MRI (DWI), is not well understood in meningiomas.
  • Both DWI and SWI are T2-derived MRI sequences.

Purpose of the Study:

  • To investigate apparent diffusion coefficient (ADC) variability in meningiomas.
  • To analyze whether susceptibility changes (SWIpos) influence diffusivity measurements.
  • To compare ADC values in meningiomas with and without susceptibility changes.

Main Methods:

  • Retrospective analysis of 36 newly diagnosed meningiomas.
  • Grouping tumors based on the presence (SWIpos) or absence (SWIneg) of susceptibility changes on SWI.
  • Calculating and comparing global ADC values using region-of-interest analysis and creating ADC histograms.

Main Results:

  • 36% of meningiomas showed susceptibility changes (SWIpos).
  • SWIpos meningiomas had significantly higher global ADC values (1.00 ± 0.15 × 10-3mm²/s) compared to SWIneg tumors (0.82 ± 0.09 × 10-3mm²/s).
  • Meningiomas with mixed SWI findings displayed two histogram peaks, while homogeneous tumors showed one peak.

Conclusions:

  • Susceptibility changes (SWIpos) increase meningioma ADC values by approximately 38% on average.
  • This ADC elevation must be considered when interpreting DWI findings for tumor behavior.
  • Further research is needed to explore ADC changes and histogram patterns for meningioma treatment monitoring.