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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...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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.
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

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Multidimensionally encoded magnetic resonance imaging.

Fa-Hsuan Lin1

  • 1Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan. fhlin@ntu.edu.tw

Magnetic Resonance in Medicine
|August 29, 2012
PubMed
Summary

Multidimensionally encoded (MDE) MRI uses higher-dimensional encoding spaces to improve magnetic resonance imaging (MRI) reconstruction. This novel framework enhances spatiotemporal resolution and efficiency in MRI scans.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Medical Imaging Physics

Background:

  • Traditional MRI relies on linear spatial encoding magnetic fields (SEMs) for spatial encoding.
  • Emerging nonlinear SEMs offer improved spatiotemporal resolution and reduced nerve stimulation.
  • Combining linear and nonlinear SEMs can further enhance MRI performance.

Purpose of the Study:

  • To introduce Multidimensionally Encoded (MDE) MRI, a novel framework for MRI.
  • To theoretically link imaging strategies employing linear and nonlinear SEMs.
  • To demonstrate the advantages of higher-dimensional encoding spaces in MRI.

Main Methods:

  • Developed a theoretical framework for MDE MRI, mapping q-dimensional objects to p-dimensional encoding spaces (p > q).
  • Implemented a 5D MDE MRI for a 2D object using an 8-surface SEM coil system and an 8-channel RF coil array.
  • Developed a method for optimizing spatial bases within the MDE MRI framework.

Main Results:

  • MDE MRI with higher dimensional encoding spaces demonstrated more efficient image reconstruction.
  • Controlled k-space sampling and sample numbers led to reduced reconstruction errors in MDE MRI.
  • The 5D MDE MRI represents a generalization of existing techniques like PatLoc and O-space imaging.

Conclusions:

  • MDE MRI provides a unified theoretical framework for advanced MRI techniques.
  • Higher dimensional encoding in MDE MRI improves reconstruction efficiency and accuracy.
  • This approach holds potential for advancing high-resolution and rapid MRI acquisition.