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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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Magnetic resonance imaging by synergistic diffusion-diffraction patterns.

Noam Shemesh1, Carl-Fredrik Westin, Yoram Cohen

  • 1School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel. Noam.Shemesh@Weizmann.ac.il

Physical Review Letters
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new imaging method using synergistic diffusion-diffractions to precisely map porous materials. This technique reveals the pore density function, offering higher resolution and detail than conventional magnetic resonance imaging (MRI).

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Area of Science:

  • Physics
  • Materials Science
  • Biomedical Engineering

Background:

  • Imaging object geometry from frequency spectrum is a long-standing scientific challenge.
  • Nuclear magnetic resonance (NMR) of porous systems aims to characterize pore microstructure.
  • Conventional magnetic resonance imaging (MRI) is limited to detecting the pore autocorrelation function, obscuring fine structural details.

Purpose of the Study:

  • To introduce a novel imaging mechanism for directly obtaining the pore density function.
  • To overcome the limitations of conventional MRI in resolving pore microstructure details.
  • To enable noninvasive imaging of object geometry, akin to 'hearing the shape of a drum'.

Main Methods:

  • Development of a unique imaging mechanism based on synergistic diffusion-diffractions.
  • Application of this mechanism to porous systems for microstructure analysis.
  • Comparison of the new method's spatial resolution and detail retention against conventional MRI.

Main Results:

  • The synergistic diffusion-diffraction mechanism directly yields the pore density function.
  • This novel approach provides substantially higher spatial resolution than conventional MRI.
  • All fine details of the collective pore morphology are retained, unlike previous methods.

Conclusions:

  • Synergistic diffusion-diffractions offer a breakthrough in imaging porous materials.
  • The method allows for precise inference of the 'shape of the drum' (pore microstructure).
  • This advancement holds significant potential for noninvasive and detailed material characterization.