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Related Concept Videos

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Sep 16, 2025

Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy
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Spatially resolved diffusion pore imaging using k-space readout.

Lucas Oswald1, Julian Rauch2, Frederik B Laun3

  • 1Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Faculty of Physics and Astronomy, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany.

Magnetic Resonance Imaging
|July 9, 2025
PubMed
Summary
This summary is machine-generated.

Nuclear magnetic resonance diffusion pore imaging (DPI) now spatially resolves pore shapes in materials. This advanced technique enables non-invasive exploration of cellular structures and pore distributions within specific regions of interest.

Keywords:
Diffusion pore imagingDiffusion weightingPore sizesSequence design

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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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Area of Science:

  • Physics
  • Materials Science
  • Biomedical Imaging

Background:

  • Nuclear magnetic resonance (NMR) diffusion methods offer powerful insights into material and tissue structures.
  • Diffusion pore imaging (DPI) provides geometric information about pores at sub-MR imaging scales.
  • Distinguishing pore shapes in heterogeneous media requires advanced spatial encoding.

Purpose of the Study:

  • To present a novel combination of 2D q-space and 2D k-space acquisition for spatially resolved DPI.
  • To demonstrate the capability of this technique to reconstruct pore shapes within specific regions of interest.
  • To validate the method using phantoms and simulations.

Main Methods:

  • Implemented a 2D q-space and 2D k-space acquisition on a 9.4T small animal scanner.
  • Extended the DPI sequence with a conventional k-space imaging readout.
  • Utilized a spin-echo approach and corrected for residual phases.

Main Results:

  • Successfully reconstructed 2D pore space functions in each k-space voxel.
  • Estimated capillary sizes (15 µm and 20 µm) in phantom regions of interest.
  • Simulations showed good agreement with measured 1D pore space functions.

Conclusions:

  • Spatially resolved pore imaging enables non-invasive exploration of cellular structure.
  • The technique reveals voxel-averaged pore shape distributions in a single DPI measurement.
  • This advancement holds significant potential for characterizing complex porous materials and biological tissues.