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Rapid whole brain 3D T2 mapping respiratory-resolved Double-Echo Steady State (DESS) sequence with improved

Emile Kadalie1, Aurélien J Trotier1, Nadège Corbin1

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This study introduces a new 3D double-echo steady-state (DESS) sequence for fast and reliable brain T2 mapping. The SPICCS-DESS method significantly reduces artifacts, improving accuracy for monitoring brain conditions.

Keywords:
3D brain imagingDESST2 mappingqMRIrespiratory B0 variation

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Quantitative Imaging
  • Neuroimaging

Background:

  • Respiratory variations (B0) introduce artifacts in brain MRI, affecting T2 mapping accuracy.
  • Standard 3D double-echo steady-state (DESS) sequences are susceptible to these artifacts.
  • Accurate and repeatable T2 mapping is crucial for diagnosing and monitoring neurological conditions.

Purpose of the Study:

  • To develop a quantitative 3D DESS sequence for rapid and repeatable brain T2 mapping.
  • To implement encoding schemes that mitigate respiratory B0 variations.
  • To compare the performance of novel sequences against a standard DESS sequence.

Main Methods:

  • A retrospective self-gating module was integrated into the DESS sequence for respiratory artifact suppression.
  • Compressed-sensing (CS-DESS) was used to accelerate acquisition.
  • Spiral Cartesian encoding (SPICCS-DESS) was incorporated to further reduce respiratory artifacts.
  • T2 distribution and repeatability were assessed in eight volunteers at 3T.

Main Results:

  • Respiratory artifact correction was optimized using seven respiratory phase bins.
  • SPICCS-DESS and CS-DESS showed significantly improved T2 distribution compared to standard DESS.
  • Test-retest T2 differences were substantially lower for SPICCS-DESS (3.5±2% gray matter, 3.1±2.1% white matter) versus fully DESS (15±13% gray matter, 7.3±5.6% white matter).
  • SPICCS-DESS halved acquisition time to under 4 minutes while maintaining T2 mapping efficiency.

Conclusions:

  • The respiratory-resolved SPICCS-DESS sequence provides rapid, robust, and repeatable 3D brain T2 mapping.
  • This technique is highly effective for longitudinal monitoring of cerebral pathologies.
  • SPICCS-DESS offers a significant advancement in quantitative neuroimaging accuracy and efficiency.