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MRI Correction In 5-7 Minutes

MRI Correction In 5-7 Minutes. Dr. Keith Evan Schubert. Situation. Functional Neurosurgery Parkinson’s Disease, Trigeminal Neuralgia Error < 1mm MRI target localization Distinguish tissue types More than 250k pixels/study Gradient Nonlinearity Distortion ~2mm error. Basic Process.

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MRI Correction In 5-7 Minutes

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  1. MRI CorrectionIn 5-7 Minutes Dr. Keith Evan Schubert

  2. Situation • Functional Neurosurgery • Parkinson’s Disease, Trigeminal Neuralgia • Error < 1mm • MRI target localization • Distinguish tissue types • More than 250k pixels/study • Gradient Nonlinearity Distortion ~2mm error

  3. Basic Process Select Slices Find Edges Fit Spherical Harmonics Ideal Image Transform Apply

  4. Spherical Harmonics • Cylinder’s Magnetic field • (x2+y2), z2 • Combinations & multiples • Pixel locations → b • Basis functions & Ideal → A • Unknown Coefficients → x • Solve Ax=b for x

  5. Corrected Images Coronal Axial Sagital

  6. Conclusions • Error reduction • Was 2mm or more • 5 to 8 pixels • σ≈ .15mm to .25mm • Less than 1 pixel • 3σ < .8mm • About 2 pixels • Meets medical needs

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