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.
|Title of host publication||Bildverarbeitung für die Medizin 2011|
|Number of pages||5|
|Publication status||Published - 01.12.2011|
|Event||Workshops Bildverarbeitung fur die Medizin 2011 - Lübeck, Germany|
Duration: 20.03.2011 → 22.03.2011
Conference number: 99531