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Stereotactic diffusion tensor imaging tractography for Gamma Knife radiosurgery.

Cormac G Gavin1, H Ian Sabin1

  • 1Gamma Knife Centre, St. Bartholomew's Hospital, London, United Kingdom.

Journal of Neurosurgery
|December 2, 2016
PubMed
Summary

Integrating diffusion tensor imaging (DTI) tractography into Gamma Knife radiosurgery (GKRS) planning improves safety. This technique helps protect critical white matter tracts and brain areas, reducing potential radiation complications.

Keywords:
ADC = apparent diffusion coefficientAVM = arteriovenous malformationCST = corticospinal tractDEC = directionally encoded colorDTI = diffusion tensor imagingFA = fractional anisotropyGKRS = Gamma Knife radiosurgeryGamma KnifeMPR = multiplanar reformattingOR = optic radiationR/VOI = region/volume of interestarteriovenous malformationsdiffusion tensor imagingstereotactic radiosurgerytractographytreatment planning

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Area of Science:

  • Neurosurgery
  • Radiology
  • Medical Imaging

Background:

  • Modern neuroimaging enhances stereotactic radiosurgery (SRS) safety and efficacy.
  • Integrating diffusion tensor imaging (DTI) tractography into Gamma Knife radiosurgery (GKRS) planning is an evolving technique.
  • Previous methods faced technical limitations in visualizing critical neural pathways.

Purpose of the Study:

  • To demonstrate the feasibility of integrating stereotactic DTI tractography into GKRS treatment planning.
  • To address and overcome technical challenges associated with prior DTI integration methods.
  • To improve the precision and safety of radiation delivery in SRS.

Main Methods:

  • Twenty patients undergoing GKRS were included, with diverse pathologies including vestibular schwannoma, arteriovenous malformations, and cerebral metastases.
  • Stereotactic DTI was performed using a 1.5-T MRI scanner with a Leksell stereotactic frame, acquiring images in 32 directions.
  • DTI data were postprocessed and coregistered with T1-weighted MRI, then integrated into GammaPlan software as 'organs at risk' for treatment planning.

Main Results:

  • Successful acquisition and processing of stereotactic DTI images were achieved in all patients.
  • Tract generation was reproducible, particularly for axial tracts like the optic radiation and arcuate fasciculus.
  • Minor artifacts affecting corticospinal tract visualization were managed through adjustments in frame/MRI volume and DTI seeding parameters.

Conclusions:

  • Integrating stereotactic DTI tractography into GKRS is feasible and reproducible.
  • This technique allows for the visualization and protection of critical white matter tracts and cortical areas.
  • It offers a promising approach to minimize radiation-induced neurological deficits and improve patient outcomes in SRS.