3D Grid Modeling with BrainLAB<br />Brian Owens, R. EP T.EEG/Image Guided Surgery<br />Minnesota Epilepsy Group | www.mnep...
Purpose<br />3D electrode grid modeling can be useful visualization electrode locale<br />Can be combined with electrical ...
Method<br />3D grid creation is very easy using BrainLAB’siPlan application<br />Before grid placement obtain a thin slice...
CT Protocol<br /><ul><li>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
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3 D Grid Modeling With Brain Lab

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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

  1. 1. 3D Grid Modeling with BrainLAB<br />Brian Owens, R. EP T.EEG/Image Guided Surgery<br />Minnesota Epilepsy Group | www.mnepilepsy.org<br />
  2. 2. Purpose<br />3D electrode grid modeling can be useful visualization electrode locale<br />Can be combined with electrical stimulation data and/or MEG/fMRI data<br />Can be helpful when used with stereotactic navigation<br />
  3. 3. Method<br />3D grid creation is very easy using BrainLAB’siPlan application<br />Before grid placement obtain a thin slice MR<br />Post surgery obtain a thin slice volume CT scan<br />Fuse CT to MR<br />Electrodes are very high in contrast on CT compared to soft tissue<br />Build grid from CT using ‘Object Creation’ and proper thresholding<br />
  4. 4. CT Protocol<br /><ul><li>Contiguous, non-overlapping slices
  5. 5. Axial slices
  6. 6. Slice thickness 1-2mm
  7. 7. Constant slice thickness
  8. 8. Square image matrix (256x256 or 512x512)
  9. 9. Square pixels
  10. 10. Standard soft tissue algorithm
  11. 11. Circular or square FOV – the smallest FOV to encompass the head
  12. 12. Include the hard palate, tip of the nose, ears, top of the head & all fiducial markers if any
  13. 13. No gantry tilt
  14. 14. Contrast agents may be injected before scanning</li></li></ul><li>Basic steps<br />Image Fusion, object creation, cerebrum auto-segmentation for 3D brain…<br />
  15. 15. Thresholding<br />Adjust the thresholding of the object abusively so that only the electrodes are created separately from soft tissue<br />Use the image to the left as a guide<br />
  16. 16. ROI<br />In ‘Auto Segmentation’ you can adjust your region of intrest to encompass the electrode array<br />You can do this in all planes<br />
  17. 17. 3D Grid<br />3D object creation of grid complete<br />Yellow voxels represent seizure dipoles obtained from MEG<br />Blue voxel represents somatosensory dipole obtained from MEG<br />
  18. 18. Grid overlay on MR<br /><ul><li>With CT fused to MR you can visualize where grid electrode positions are in all planes on MR
  19. 19. You will notice some lateral electrode shift from brain surface when overlaid on prior MR</li></li></ul><li>WIKI<br />Thresholding (Image Processing)http://en.wikipedia.org/wiki/Thresholding_(image_processing)<br />Image Guided Surgeryhttp://en.wikipedia.org/wiki/Computer_assisted_surgery<br />Magnetoencehpalography<br />http://en.wikipedia.org/wiki/Magnetoencephalography<br />
  20. 20. 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.<br />www.mnepilepsy.org<br />www.brainlab.com<br />

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