Navigated and Robotized Transcranial Magnetic Stimulation based on 3D Laser Scans


Navigated and robotized Transcranial Magnetic Stimulation (TMS) is advancing forward in research and treatment. MRI-scans or other medical image data are typically used as navigation source. Unfortunately, scanning time is always short and expensive. For many TMS-applications the underlying brain topology is not necessarily needed. Therefore, we generate the subject's head contour for a precise stimulation from 3D laser scans. We use the PowerCrust algorithm generating a smooth contour from laser surface points. The mean error found was 0.289 with an RMS error of 0.358 mm and a maximum error of 0.984 mm comparing MRI-scan to laser scan for a head phantom. Currently, we are working successfully with head contours based on 3D laser scans for two ongoing TMS studies. During these TMS-experiments, the overall error found for the robotized TMS system using laser scans was < 5 mm. With new and faster laser technologies, it will be possible to use laser scans as navigation source and for direct head tracking during stimulation when scanner become real time capable.

Original languageGerman
Title of host publicationBildverarbeitung für die Medizin 2011
Number of pages5
PublisherSpringer Verlag
Publication date01.12.2011
ISBN (Print)978-3-642-19334-7
ISBN (Electronic)978-3-642-19335-4
Publication statusPublished - 01.12.2011
EventWorkshops Bildverarbeitung fur die Medizin 2011 - Lübeck, Germany
Duration: 20.03.201122.03.2011
Conference number: 99531

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