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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
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.
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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

Published on: May 18, 2011

Robust selective signal suppression using binomial off-resonant rectangular (BORR) pulses.

Yongquan Ye1, Jiani Hu, E Mark Haacke

  • 1Department of Radiology, Wayne State University, Detroit, Michigan, USA.

Journal of Magnetic Resonance Imaging : JMRI
|April 17, 2013
PubMed
Summary
This summary is machine-generated.

The binomial off-resonant rectangular (BORR) pulse method offers effective selective signal suppression in MRI. This efficient technique provides robust performance for various imaging applications.

Keywords:
binomial RF pulsechemical shift imagingoff-resonanceselective suppression

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency Pulse Design
  • Biomedical Engineering

Background:

  • Selective radiofrequency (RF) pulses are crucial for targeted signal manipulation in MRI.
  • Existing saturation pulse methods can have limitations in suppression bandwidth and robustness.
  • Developing efficient and reliable RF pulse sequences is essential for advanced imaging techniques.

Purpose of the Study:

  • To evaluate the selective signal suppression capabilities of the binomial off-resonant rectangular (BORR) radiofrequency pulse.
  • To assess the efficiency and robustness of the BORR pulse method for MRI applications.

Main Methods:

  • The BORR pulse was designed using two consecutive rectangular pulses with a π phase difference.
  • Simulations using the Bloch equations determined the frequency response of the BORR pulse.
  • The BORR pulse was implemented in a gradient echo sequence and tested on phantoms and in vivo (knee, breast).

Main Results:

  • Phantom experiments validated the theoretical frequency response of the BORR pulse.
  • The BORR pulse demonstrated broad suppression bands, leading to high suppression efficiency.
  • In vitro and in vivo scans showed robust performance compared to other saturation pulses.

Conclusions:

  • The BORR pulse method is a simple and effective alternative for selective signal suppression in MRI.
  • It offers high efficiency and robustness, making it suitable for three-dimensional short repetition time (TR) imaging.
  • The BORR pulse represents a valuable advancement for specialized MRI applications.