3 D Grid Modeling With Brain Lab
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3 D Grid Modeling With Brain Lab



Building a 3D representation of a subdural electrode array using BrainLAB iPlan 3.x application.

Building a 3D representation of a subdural electrode array using BrainLAB iPlan 3.x application.



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    3 D Grid Modeling With Brain Lab 3 D Grid Modeling With Brain Lab Presentation Transcript

    • 3D Grid Modeling with BrainLAB
      Brian Owens, R. EP T.EEG/Image Guided Surgery
      Minnesota Epilepsy Group | www.mnepilepsy.org
    • Purpose
      3D electrode grid modeling can be useful visualization electrode locale
      Can be combined with electrical stimulation data and/or MEG/fMRI data
      Can be helpful when used with stereotactic navigation
    • Method
      3D grid creation is very easy using BrainLAB’siPlan application
      Before grid placement obtain a thin slice MR
      Post surgery obtain a thin slice volume CT scan
      Fuse CT to MR
      Electrodes are very high in contrast on CT compared to soft tissue
      Build grid from CT using ‘Object Creation’ and proper thresholding
    • CT Protocol
      • Contiguous, non-overlapping slices
      • Axial slices
      • Slice thickness 1-2mm
      • Constant slice thickness
      • Square image matrix (256x256 or 512x512)
      • Square pixels
      • Standard soft tissue algorithm
      • Circular or square FOV – the smallest FOV to encompass the head
      • Include the hard palate, tip of the nose, ears, top of the head & all fiducial markers if any
      • No gantry tilt
      • Contrast agents may be injected before scanning
    • Basic steps
      Image Fusion, object creation, cerebrum auto-segmentation for 3D brain…
    • Thresholding
      Adjust the thresholding of the object abusively so that only the electrodes are created separately from soft tissue
      Use the image to the left as a guide
    • ROI
      In ‘Auto Segmentation’ you can adjust your region of intrest to encompass the electrode array
      You can do this in all planes
    • 3D Grid
      3D object creation of grid complete
      Yellow voxels represent seizure dipoles obtained from MEG
      Blue voxel represents somatosensory dipole obtained from MEG
    • Grid overlay on MR
      • With CT fused to MR you can visualize where grid electrode positions are in all planes on MR
      • You will notice some lateral electrode shift from brain surface when overlaid on prior MR
    • WIKI
      Thresholding (Image Processing)http://en.wikipedia.org/wiki/Thresholding_(image_processing)
      Image Guided Surgeryhttp://en.wikipedia.org/wiki/Computer_assisted_surgery
    • This slideshow has no official affiliation with BrainLAB. All images used were obtained using real patient data with no patient identifying information. The iPlan 3.x application is a product of BrainLAB, INC.