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Related Experiment Video

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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B1+ inhomogeneity mitigation in CEST using parallel transmission.

Desmond H Y Tse1, Nuno Andre da Silva2, Benedikt A Poser1

  • 1Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands.

Magnetic Resonance in Medicine
|March 1, 2017
PubMed
Summary
This summary is machine-generated.

Parallel transmission (pTx) improves flip-angle homogeneity in ultrahigh field (UHF) chemical exchange saturation transfer (CEST) imaging. This study validates a pTx-based presaturation pulse, enhancing CEST contrast homogeneity in vivo.

Keywords:
RF inhomogeneityRF pulse designchemical exchange saturation transferparallel transmissionpulsed CESTultra-high-field MRI

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Physics

Background:

  • Ultrahigh field (UHF) MRI offers increased spectral bandwidth.
  • Chemical Exchange Saturation Transfer (CEST) imaging benefits from UHF but faces challenges with flip-angle inhomogeneity.
  • Parallel transmission (pTx) is a technique to improve radiofrequency field homogeneity.

Purpose of the Study:

  • To investigate the use of parallel transmission (pTx) to mitigate flip-angle inhomogeneity in UHF CEST imaging.
  • To develop and validate a pTx-based presaturation pulse for improved CEST contrast.

Main Methods:

  • A pTx saturation pulse was designed using magnitude least-squares (MLS) optimization.
  • Simulations using the Bloch-McConnell equation evaluated the impact of pTx on CEST contrast.
  • In vivo 7T CEST imaging compared the pTx pulse against a standard Gaussian pulse in 3 healthy volunteers.

Main Results:

  • Simulations confirmed that pTx saturation pulse sidebands did not negatively impact CEST contrast.
  • In vivo imaging demonstrated improved homogeneity in CEST contrasts and relaxation-compensated metrics with the pTx pulse.
  • The pTx pulse provided more uniform CEST effects compared to the standard pulse.

Conclusions:

  • A novel pTx-based pulsed CEST presaturation scheme was successfully proposed.
  • The pTx scheme was validated through both simulations and 7T in vivo imaging.
  • This method offers a promising approach for enhancing CEST imaging at UHF.