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Related Experiment Videos

Subarachnoid hemorrhage: evaluation with MR imaging

T Ogawa1, A Inugami, E Shimosegawa

  • 1Department of Radiology, Research Institute of Brain and Blood Vessels-Akita, Japan.

Radiology
|February 1, 1993
PubMed
Summary

Magnetic resonance (MR) imaging can reliably detect subarachnoid hemorrhage (SAH) using specific parameters. While CT is preferred for acute SAH, MR demonstrates SAH effectively in both acute and later stages.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Subarachnoid hemorrhage (SAH) is a critical condition often caused by ruptured aneurysms.
  • Accurate and timely diagnosis of SAH is crucial for patient outcomes.
  • Computed tomography (CT) is the current standard for acute SAH detection.

Purpose of the Study:

  • To evaluate the efficacy of magnetic resonance (MR) imaging in detecting subarachnoid hemorrhage (SAH) at different stages.
  • To compare the detectability of SAH using various MR pulse sequences.

Main Methods:

  • Thirty-seven MR examinations were performed at 0.5 T in 33 patients with confirmed SAH.
  • MR images were acquired using proton-density, T1-weighted, and T2-weighted sequences.
  • Image analysis focused on SAH detectability in acute (<72 hours) and subacute/chronic (>3 days) stages.

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Main Results:

  • Proton-density-weighted images showed high SAH detectability (83%) in subacute/chronic stages.
  • Acute SAH detectability varied: 36% on T1-weighted and 50% on T2-weighted images.
  • In acute SAH, proton-density-weighted images demonstrated SAH hyperintensity compared to brain parenchyma and CSF.

Conclusions:

  • MR imaging, particularly with proton-density-weighted sequences, is effective for demonstrating SAH across different time points.
  • Appropriate MR imaging parameters can enable reliable detection of acute SAH, complementing CT findings.
  • MR imaging offers a valuable alternative or adjunctive tool for SAH evaluation.