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Related Concept Videos

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...

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A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
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A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia

Published on: September 16, 2017

Real-time diffusion-perfusion mismatch analysis in acute stroke.

Matus Straka1, Gregory W Albers, Roland Bammer

  • 1Department of Radiology, Stanford University, Stanford, California 94305-5488, USA.

Journal of Magnetic Resonance Imaging : JMRI
|October 30, 2010
PubMed
Summary
This summary is machine-generated.

Automated processing of diffusion and perfusion imaging rapidly identifies acute stroke patients eligible for reperfusion therapy. The RAPID system provides accurate mismatch information within minutes for timely clinical decisions.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Medical Technology

Background:

  • Diffusion-perfusion mismatch is crucial for identifying acute stroke patients who may benefit from reperfusion therapies.
  • Timely assessment of this mismatch is essential for prompt diagnosis and treatment decisions in acute stroke cases.

Purpose of the Study:

  • To develop and evaluate the RApid processing of PerfusIon and Diffusion (RAPID) system for automated, unsupervised processing of diffusion and perfusion data.
  • To expedite routine clinical assessment of acute stroke patients by providing rapid and accurate mismatch information.

Main Methods:

  • The RAPID system computes quantitative perfusion maps (CBV, CBF, MTT, Tmax) using deconvolution.
  • Automated segmentation of infarct core (ADC maps) and perfusion deficits (Tmax maps) determines the diffusion-weighted imaging/perfusion-weighted imaging (DWI/PWI) mismatch.
  • Performance was evaluated on 63 acute stroke cases comparing RAPID's outlined lesion volumes to human reader outlines.

Main Results:

  • High correlation between RAPID and human reader outlined lesion volumes (r(2) = 0.99 for DWI, r(2) = 0.96 for PWI).
  • RAPID demonstrated 100% sensitivity and 91% specificity for mismatch identification.
  • Mismatch information was available on PACS within 5-7 minutes.

Conclusions:

  • The automated RAPID system is accurate and fast enough for routine clinical care in acute stroke.
  • The system's speed and accuracy support its use in both clinical practice and research trials.
  • RAPID facilitates expedited diagnosis and treatment decisions by providing rapid, reliable mismatch information.