Related Experiment Video
Updated: Jun 23, 2026
09:59
A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
Published on: September 16, 2017
Diffusion and perfusion MR imaging of acute ischemic stroke
Ashley D Harris1, Shelagh B Coutts, Richard Frayne
1Department of Radiology, University of Calgary, Calgary, Alberta, T2N 2T9 Canada. rfrayne@ucalgary.ca
Summary
Diffusion and perfusion MR imaging are valuable tools for understanding acute ischemic stroke. This review covers their concepts, applications, and limitations in diagnosing cerebral ischemia.
Area of Science:
- Radiology
- Neurology
- Medical Imaging
Background:
- Acute and hyperacute ischemic stroke present significant clinical challenges.
- Diffusion and perfusion Magnetic Resonance (MR) imaging offer critical insights into stroke pathophysiology.
Purpose of the Study:
- To provide an overview of diffusion and perfusion MR imaging techniques.
- To discuss current developments, applications, challenges, and limitations in cerebral ischemia.
Main Methods:
- Review of fundamental principles of diffusion imaging.
- Review of fundamental principles of perfusion imaging.
- Analysis of current literature on MR imaging in ischemic stroke.
Main Results:
- Diffusion MR imaging detects early cytotoxic edema characteristic of ischemia.
- Perfusion MR imaging assesses blood flow and tissue viability, aiding in reperfusion therapy decisions.
- Both techniques are essential for accurate stroke diagnosis and management.
Conclusions:
- Diffusion and perfusion MR imaging are indispensable for the clinical evaluation of ischemic stroke.
- Ongoing advancements continue to refine the application and efficacy of these MR techniques.
- Understanding the limitations is crucial for optimal clinical utilization in cerebral ischemia.
Related Concept Videos
01:17Assessment 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...
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...
01:24Magnetic 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...
01:15Ischemic Stroke ll: Pathophysiology
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
01:15Ischemic Stroke l: Introduction
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.