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Related Experiment Video

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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Visualization of subcortical language pathways by diffusion tensor imaging fiber tracking based on rTMS language

Chiara Negwer1,2, Sebastian Ille1,2, Theresa Hauck1,2

  • 1Department of Neurosurgery, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany.

Brain Imaging and Behavior
|June 22, 2016
PubMed
Summary
This summary is machine-generated.

This study demonstrates that using repetitive navigated transcranial magnetic stimulation (rTMS) to guide diffusion tensor imaging fiber tracking (DTI FT) reliably visualizes subcortical language tracts. Optimal settings were identified for standardizing this DTI FT approach in patients with brain lesions.

Keywords:
Cortical mappingFiber trackingLanguageSubcorticalTranscranial magnetic stimulation

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Neurosurgery

Background:

  • Diffusion tensor imaging fiber tracking (DTI FT) is crucial for visualizing subcortical fiber tracts.
  • A standardized method for reliably visualizing language-involved subcortical fibers is currently lacking.
  • Lesions in the perisylvian region can significantly impact language function.

Purpose of the Study:

  • To investigate the feasibility of using language-related cortical areas identified by repetitive navigated transcranial magnetic stimulation (rTMS) as seed regions for DTI FT.
  • To establish optimal parameters for DTI FT to visualize subcortical language tracts.
  • To assess the reliability and standardization of an rTMS-guided DTI FT approach for subcortical language tract visualization.

Main Methods:

  • Examined 37 patients with left-hemispheric perisylvian lesions between 2011 and 2014.
  • Language-positive rTMS stimulation spots were used as seed regions for deterministic DTI FT.
  • Tractography was performed using 77 combinations of fiber lengths (40-100 mm) and fractional anisotropy (FA; 0.01-0.5).

Main Results:

  • The rTMS-based DTI FT successfully identified major subcortical language tracts, including the arcuate fascicle and superior longitudinal fascicle.
  • 86.5% of patients showed visualization of all commonly known subcortical language tracts.
  • Optimal visualization was achieved with a fiber length of 100 mm and FA of 0.1 or 0.15, identifying 90% of language-related tracts.

Conclusions:

  • Repetitive navigated transcranial magnetic stimulation-guided DTI FT is a feasible method for visualizing subcortical language tracts.
  • This study provides optimal settings for rTMS-based DTI FT, enhancing its application.
  • The approach is easy to implement and standardizable, enabling visualization of language tracts in most patients.