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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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...
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Applications Of NMR In Biology01:25

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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.
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Atomic Nuclei: Magnetic Resonance01:05

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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...
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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Nuclear Magnetic Resonance (NMR): Overview01:07

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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.
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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Recent Advances in MR Hardware and Software.

Andrea Kierans1, Nainesh Parikh1, Hersh Chandarana1

  • 1Department of Radiology, New York University Langone Medical Center, 660 First Avenue, New York, NY 10016, USA.

Radiologic Clinics of North America
|May 9, 2015
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Summary
This summary is machine-generated.

Advances in abdominopelvic MRI enhance image quality and speed. Innovations like non-Cartesian imaging, dual RF transmit systems, and hybrid PET/MRI are improving diagnostic capabilities.

Keywords:
Abdominal MRIHybrid PET/MR imagingNon-Cartesian imaging techniquesPET/MR systemsRadial imagingSpiral imaging

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biophysics

Background:

  • Abdominopelvic magnetic resonance imaging (MRI) has seen significant advancements.
  • Continuous improvements focus on enhancing image quality, acquisition speed, and robustness.

Purpose of the Study:

  • To discuss emerging technologies in abdominopelvic MRI.
  • To explore the role of non-Cartesian acquisition and dual parallel radiofrequency (RF) transmit systems.
  • To examine the evolving applications of hybrid positron emission tomography/magnetic resonance imaging (PET/MR).

Main Methods:

  • Review of non-Cartesian acquisition schemes.
  • Discussion of dual parallel radiofrequency (RF) transmit systems.
  • Analysis of hybrid PET/MR imaging integration.

Main Results:

  • Non-Cartesian schemes and dual RF transmit systems contribute to improved abdominal MRI quality.
  • Hybrid PET/MR systems offer synergistic benefits by combining functional and anatomical imaging.
  • These advancements collectively enhance diagnostic accuracy and efficiency in abdominopelvic imaging.

Conclusions:

  • Emerging technologies are revolutionizing abdominopelvic MRI.
  • Hybrid PET/MR imaging represents a significant step forward in multimodal diagnostics.
  • Further integration of these technologies promises enhanced patient care through superior imaging.