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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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How much would performing diffusion-weighted imaging for all transient ischemic attacks increase MRI utilization?

Opeolu Adeoye1, Laura Heitsch, Charles J Moomaw

  • 1Departments of Emergency Medicine and Neurosurgery, University of Cincinnati Medical Center, Cincinnati, OH 45267-0525, USA. opeolu.adeoye@uc.edu

Stroke
|August 28, 2010
PubMed
Summary
This summary is machine-generated.

In 2005, only 40% of transient ischemic attack (TIA) patients received MRI/diffusion-weighted imaging (DWI). This imaging revealed infarction in 15% of cases, suggesting broader use could improve diagnosis of actual strokes.

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Area of Science:

  • Neurology
  • Radiology
  • Public Health

Background:

  • The American Heart Association updated the definition of transient ischemic attack (TIA) to exclude neuroimaging evidence of infarction.
  • Magnetic Resonance Imaging (MRI) with diffusion-weighted imaging (DWI) is a preferred modality due to its advantages in detecting ischemic lesions.

Purpose of the Study:

  • To determine the frequency of MRI/DWI utilization for TIA cases in a specific community in 2005.
  • To ascertain the proportion of clinically defined TIA patients with ischemic lesions on DWI.

Main Methods:

  • A retrospective review of all clinically defined TIA cases presenting to emergency departments in a 5-county region in 2005.
  • Data collected included demographics, medical history, MRI/DWI performance, and DWI findings.
  • Generalized estimating equations were used for statistical analysis.

Main Results:

  • Of 834 TIA events, MRI/DWI was performed in 323 (40%).
  • Patients undergoing MRI/DWI differed demographically and clinically from those who did not.
  • Acute infarction was detected on DWI in 51 of 323 events (15.8%).

Conclusions:

  • Widespread MRI/DWI use for all clinically defined TIA cases would increase the detection of infarction.
  • Current MRI/DWI utilization for TIA would more than double with universal application.
  • Further research is needed to evaluate the necessity of MRI/DWI for all TIA patients.