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Related Concept Videos

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...
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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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Accelerating time-resolved MRA with multiecho acquisition.

Hyun J Jeong1, Christopher S Eddleman, Saurabh Shah

  • 1Biomedical Engineering, Northwestern University, Chicago, Illinois, USA.

Magnetic Resonance in Medicine
|June 1, 2010
PubMed
Summary
This summary is machine-generated.

A novel four-dimensional magnetic resonance angiography (4D MRA) technique accelerates imaging using multiecho acquisition, enhancing signal-to-noise ratio (SNR) and spatial resolution for better vascular lesion diagnosis.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Cardiovascular Imaging

Background:

  • Magnetic Resonance Angiography (MRA) is crucial for visualizing blood vessels.
  • Traditional MRA techniques face challenges in balancing speed, spatial resolution, and signal-to-noise ratio (SNR).
  • Accelerated imaging is essential for dynamic studies, particularly in diagnosing vascular lesions.

Purpose of the Study:

  • To introduce and evaluate a new four-dimensional MRA technique: contrast-enhanced angiography with multiecho and radial k-space.
  • To demonstrate the technique's ability to accelerate image acquisition while maintaining high spatial resolution and improving SNR.
  • To assess the potential of this technique for diagnosing vascular lesions requiring accurate dynamic information.

Main Methods:

  • Development of a novel four-dimensional MRA technique utilizing multiecho and radial k-space acquisition.
  • Implementation of multiecho (echo-planar imaging) acquisition for intrinsic acceleration without parallel imaging or undersampling.
  • Exploitation of longer pulse repetition times, decreased specific absorption rate, and minimized contrast bolus effects for SNR enhancement.
  • Validation through simulations, phantom studies, and in vivo scans.
  • Exploration of combining the technique with parallel imaging (e.g., GRAPPA) for further acceleration.

Main Results:

  • Achieved an approximate 2-fold acceleration factor using multiecho acquisition alone.
  • Demonstrated increased SNR due to optimized pulse parameters and reduced artifact from transient contrast bolus.
  • Confirmed the technique's feasibility and performance through simulations, phantom, and in vivo studies.
  • Showcased potential for an additional 2-fold acceleration when combined with parallel imaging techniques like GRAPPA.
  • Maintained high spatial resolution throughout the accelerated acquisition.

Conclusions:

  • The developed contrast-enhanced angiography with multiecho and radial k-space technique significantly accelerates 4D MRA acquisition.
  • The technique offers improved SNR and high spatial resolution, crucial for detailed vascular imaging.
  • It provides a valuable tool for diagnosing vascular lesions by enabling accurate dynamic assessment.
  • The combination with parallel imaging further enhances its clinical utility for faster and more comprehensive vascular evaluations.