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Related Concept Videos

Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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
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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...
Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...

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Engineering clinical translation of OGSE diffusion MRI.

Ante Zhu1, Eric S Michael2, Hua Li3

  • 1Technology and Innovation Center, GE HealthCare, Niskayuna, New York, USA.

Magnetic Resonance in Medicine
|May 7, 2025
PubMed
Summary

Oscillating gradient spin echo (OGSE) diffusion MRI probes microstructure at short length scales. Engineering OGSE for human imaging requires careful consideration of hardware and safety for clinical translation.

Keywords:
MRI system engineeringclinical translationhigh‐performance gradientmicrostructureoscillating gradienttime‐dependent diffusion

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Neuroscience

Background:

  • Oscillating gradient spin echo (OGSE) diffusion MRI (dMRI) offers sensitivity to tissue microstructure at short length scales ( m) by probing diffusive dynamics on short time scales (≲10 ms).
  • Pre-clinical studies have established OGSE-based techniques for characterizing cell diameter and cellular density, demonstrating potential in differentiating tumor types, assessing treatment effectiveness, and understanding neurological diseases.
  • Recent advancements in high-performance gradient human MRI systems create opportunities to translate OGSE findings from pre-clinical research to human studies and clinical applications.

Purpose of the Study:

  • To review the challenges and considerations for implementing OGSE dMRI in human studies.
  • To summarize the impact of hardware and human biophysical safety factors on OGSE waveform design, imaging parameters, and image quality.
  • To highlight the potential of OGSE dMRI to advance understanding of human brain microstructure and improve patient care.

Main Methods:

  • Review of hardware and human biophysical safety considerations impacting OGSE dMRI waveform design.
  • Discussion of factors including gradient amplitude, slew rate, peripheral nerve and cardiac stimulation, gradient driver limitations, acoustic noise, mechanical vibration, eddy currents, gradient nonlinearity, concomitant gradients, motion, flow, and signal-to-noise ratio.
  • Analysis of engineering requirements for safe, high-quality, and reproducible OGSE dMRI in human subjects.

Main Results:

  • Engineering OGSE diffusion encoding for human imaging presents significant challenges compared to conventional pulsed gradient spin echo methods.
  • Various hardware and safety factors critically influence the achievable imaging parameter space and overall image quality.
  • Understanding and mitigating these factors are essential for successful translation.

Conclusions:

  • Targeted engineering efforts focused on safety, quality, and reproducibility are crucial for enabling the clinical translation of OGSE dMRI techniques.
  • Successful implementation of OGSE dMRI in humans promises to enhance the study of brain microstructure and improve diagnostic capabilities for neurological conditions.
  • Overcoming engineering hurdles will unlock the full potential of OGSE dMRI for both research and clinical practice.