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Concurrent EEG and Functional MRI Recording and Integration Analysis for Dynamic Cortical Activity Imaging
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Improving parametric estimation in the brain from multispin-echo sequences using a fusion bootstrap moves solver.

Andreia C Freitas1, Andreia S Gaspar1, Inês Sousa1

  • 1Institute for Systems and Robotics (ISR-Lisboa)/LaRSyS and Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal.

Magnetic Resonance in Medicine
|July 7, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for simultaneously estimating the brain's transmit field (B1+) and T2 maps using multispin-echo sequences. The technique improves accuracy and spatial homogeneity in B1+ mapping without additional costs.

Keywords:
echo-modulation curvesmulti spin-echo

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Quantitative MRI

Background:

  • T2 mapping provides critical data for assessing brain degenerative diseases.
  • Multispin-echo (MSE) sequences are standard for T2 mapping, with dictionary matching enhancing accuracy.
  • Accurate T1 quantification necessitates knowledge of the transmit B1+ field.

Purpose of the Study:

  • To develop a method for simultaneous estimation of the brain's B1+ field and T2 values using MSE sequences.
  • To investigate the efficacy of the fusion bootstrap moves solver (FBMS) for improving B1+ accuracy and spatial smoothness.
  • To compare different spatial regularization levels for B1+ and T2 estimation.

Main Methods:

  • Utilized multispin-echo (MSE) sequences with dictionary matching for signal analysis.
  • Applied the fusion bootstrap moves solver (FBMS), an iterative method considering pixel neighborhoods, for B1+ estimation.
  • Employed total variation regularization for simultaneous B1+ and T2 estimation as a proof-of-concept.

Main Results:

  • Achieved significant improvements in B1+ accuracy, with error reductions up to 45.37% in simulations.
  • Demonstrated recovery of spatially homogeneous B1+ maps in in vivo 3.0T brain data, with a 16.81% decrease in B1+ error.
  • Validated the effectiveness of FBMS in enhancing B1+ map quality.

Conclusions:

  • Simultaneous B1+ and T2 mapping is feasible using readily available MSE sequences.
  • Echo-modulation curve matching combined with FBMS offers an effective and cost-efficient approach for accurate B1+ estimation.
  • The developed method enhances quantitative MRI of the brain.