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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...
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...
Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Related Experiment Video

Updated: May 28, 2026

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
17:06

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

Diffusion, confusion and functional MRI.

Denis Le Bihan1

  • 1NeuroSpin, CEA Saclay-Center, Gif-sur-Yvette, France. denis.lebihan@gmail.com

Neuroimage
|October 12, 2011
PubMed
Summary
This summary is machine-generated.

Diffusion MRI can now image brain function, offering a faster signal than traditional fMRI. This new method, DfMRI, reveals rapid tissue changes during neural activation.

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging

Background:

  • Diffusion MRI, established in 1985, is a standard for imaging stroke and white matter disorders.
  • The distinction between diffusion MRI and functional MRI (fMRI) has historically been unclear.
  • Early research explored using diffusion MRI for brain function imaging via the intravoxel incoherent motion (IVIM) concept, linking it to blood flow.

Observation:

  • The IVIM concept provided insights into vascular contributions to the Blood Oxygen Level-Dependent (BOLD) fMRI signal.
  • Recent advancements have enabled a genuine fMRI signal directly from diffusion MRI techniques.
  • This novel diffusion fMRI (DfMRI) signal exhibits a significantly faster response to brain activation compared to BOLD fMRI.

Findings:

  • DfMRI's rapid onset and offset kinetics suggest sensitivity to rapid structural changes in neural tissues, potentially including cell swelling.
  • This contrasts with the slower hemodynamic response typically measured by BOLD fMRI.
  • Technical advancements in MRI equipment have been crucial for developing diffusion MRI's functional imaging capabilities.

Implications:

  • DfMRI offers a new window into the real-time dynamics of neural activation and tissue response.
  • This technique may provide complementary or alternative insights into brain function compared to conventional fMRI.
  • Future research can leverage DfMRI to explore various neurological conditions and cognitive processes with enhanced temporal resolution.