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Enhancing 7T MRI for deep brain stimulation with deep-learning based image reconstruction and dynamic parallel

Justyna O Ekert1, Vishal Patel1, Xiangzhi Zhou1

  • 1Department of Radiology, Mayo Clinic, Jacksonville, FL, USA.

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Deep learning (DL) reconstruction and dynamic parallel transmission (pTx) significantly enhance 7 Tesla (7T) MRI for deep brain stimulation (DBS) protocols. This advanced imaging improves image quality, target conspicuity, and motion robustness, while reducing overall scan time.

Keywords:
EpilepsyNeuromodulationParallel transmissionParkinson’s diseaseTremorUltra-high field MRI

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Area of Science:

  • Neuroimaging
  • Medical Physics
  • Radiology

Background:

  • Precise targeting of subcortical structures is essential for effective deep brain stimulation (DBS).
  • Seven Tesla (7T) MRI offers superior resolution but faces challenges like B1+ inhomogeneity, long scan times, and motion sensitivity, limiting its clinical use for DBS.
  • Deep learning (DL)-based reconstruction and dynamic parallel transmission (pTx) are emerging techniques to address these limitations.

Purpose of the Study:

  • To evaluate the efficacy of DL-based image reconstruction and dynamic pTx in optimizing 7T MRI protocols for deep brain stimulation (DBS).
  • To assess improvements in image quality, target conspicuity, and motion artifact reduction using the enhanced protocol compared to conventional methods.

Main Methods:

  • A comparative study involving 13 patients scanned with a conventional 7T DBS protocol and 13 patients with an enhanced protocol using DL reconstruction and dynamic pTx.
  • Image quality, motion artifact, and target conspicuity were assessed by two readers using 5-point Likert scales.
  • Ordinal logistic regression was employed to determine the odds ratios (OR) for improvements with the enhanced protocol.

Main Results:

  • The enhanced protocol significantly improved image quality (OR=4.4), target conspicuity (OR=3.4), and reduced motion artifacts (OR=3.8) in MP2RAGE imaging.
  • FGATIR showed improved delineation of globus pallidus interna (OR=22.9) and dentato-rubro-thalamic tract (OR=8.8).
  • SPACE improved subthalamic nucleus (STN) delineation (OR=25.3), SWI enhanced image quality (OR=17.4) and STN delineation (OR=16.9), and 3D SPGR improved image quality (OR=17.4) and vessel visualization (OR=26.1).
  • Overall protocol duration was reduced by 36.9% (from 42:16 to 26:40).

Conclusions:

  • DL reconstruction combined with dynamic pTx effectively enhances 7T MRI for DBS.
  • The optimized protocol leads to superior image quality, better target definition, and increased robustness to motion.
  • This approach significantly shortens the overall 7T DBS protocol time, facilitating clinical adoption.