Abstract #4152

Development of an optimal head localizer for stereotactic neurosurgery at 7.0T with minimal image geometric distortions

Aaron E Rusheen^1,2, Elise M Berning¹, Dane T Bothun¹, Ben T Gifford¹, Stephan J Goerss¹, Kirk M Welker³, John Huston³, Kevin E Bennet^1,4, Yoonbae Oh^1,5, Charles D Blaha¹, Kendall H Lee^1,5, and Fagan J Andrew³

¹Department of Neurosurgery, Mayo Clinic, Rochester, MN, United States, ²Medical Scientist Training Program, Mayo Clinic, Rochester, MN, United States, ³Department of Radiology, Mayo Clinic, Rochester, MN, United States, ⁴Department of Engineering, Mayo Clinic, Rochester, MN, United States, ⁵Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, United States

7.0T MRI provides precise visualization and targeting of brain structures for image-guided stereotactic neurosurgery. However, image localizers used by stereotactic systems do not exist for 7.0T scanners. Challenges in their development include: the small bore creates geometric constraints that disallow use of conventional localizers, and the increased B₀ increases geometric distortion, affecting registration accuracy. Here, a skull-contoured localizer utilizing point fiducials was designed to attach to a novel stereotactic frame. Extracranial distortion was thoroughly mapped using several optimized imaging sequences. This data was used to optimally place fiducials on the localizer, improving registration accuracy.

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