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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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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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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Double Resonance Techniques: Overview01:12

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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.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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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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Updated: Sep 11, 2025

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Multiband Fast Spin Echo on portable low-field systems.

Philip K Lee1, Yueqi Qiu1, Changyue Wang1

  • 1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, People's Republic of China.

Magnetic Resonance in Medicine
|August 11, 2025
PubMed
Summary
This summary is machine-generated.

RF-encoded multiband imaging enhances signal-to-noise ratio (SNR) efficiency in Fast Spin Echo (FSE) sequences. This technique is effective for improving image quality on low-field portable MRI systems.

Keywords:
Fast Spin Echoconcomitant fieldslow‐field portable MRImultiband RF pulse designnon Carr‐Purcell‐Meiboom‐Gill artifacts

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Development
  • Medical Physics

Background:

  • Fast Spin Echo (FSE) is a widely used MRI technique for efficient image acquisition.
  • Improving Signal-to-Noise Ratio (SNR) efficiency is crucial for enhancing image quality, especially in portable or low-field systems.
  • Artifacts from non-Carr-Purcell-Meiboom-Gill (CPMG) magnetization can degrade image quality in FSE sequences.

Purpose of the Study:

  • To enhance the SNR efficiency of FSE using RF-encoded multiband imaging.
  • To develop artifact correction techniques for non-CPMG magnetization in FSE sequences.
  • To evaluate the performance of the developed techniques on a portable low-field MRI system.

Main Methods:

  • Calculated optimal 0-π band phase modulations for RF-encoded multiband FSE pulses.
  • Employed fast recovery for enhanced T2 contrast.
  • Utilized quadratic phase refocusing, gradient reshaping, and RF phase calibrations to mitigate non-CPMG magnetization artifacts.

Main Results:

  • RF-encoded multiband pulses achieved SNR improvements close to the theoretical $\sqrt{N_{bands}}$ factor.
  • Techniques like quadratic phase increment and bipolar phase encoding effectively reduced shading and ghosting artifacts.
  • Optimized RF phase calibrations and gradient reshaping improved contrast for long T2 species.

Conclusions:

  • RF-encoded multiband imaging offers a viable strategy for boosting SNR efficiency in FSE.
  • The developed artifact correction methods improve image quality on low-field portable MRI systems.
  • This approach holds promise for more accessible and efficient MRI diagnostics.