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We describe an improved version of the double magnetic induction method for measuring eye movement, proposed by Reulen and Bakker. The idea behind the double magnetic method is to detect eye position indirectly by determining the strength of the induced secondary magnetic field of a short-circuited coil on the subject's eye caused by a primary magnetic(More)
Today, it is possible to acquire volume representations of the vessel structures in the brain. The selfadjusting probe, a new tool introduced in a previous paper, enables semi-automatic shape extraction. The self-adjusting probe extracts shapes from a surface model. Yet, if two vessel branches are close together, it is possible that surface vertices of a(More)
Although the principle of using x-rays for diagnostic imaging has been known for a long time, there is still a lot of research and improvements going on in the field. One recent addition to the neuro-vascular imaging system—used for visualizing blood vessels in the brain and guidance of interventions—is 3D rotational angiography (3D-RA). Using 3D-RA, it is(More)
Volume representations of blood vessels acquired by 3D rotational angiography are very suitable for diagnosing a stenosis or an aneurysm. For optimal treatment, physicians need to know the shape of the diseased vessel parts. Binary segmentation by thresholding is the first step in our shape extraction procedure. Assuming a twofold Gaussian mixture model(More)
At the Graphics Cluster of Philips Research Labs Eind-hoven, research is being done on real-time animation of implicit surfaces. This report describes the creation of an animation system that facilitates building simple implicit surface animations by creating a model using an interactive modeller and animating that model by means of a modest scripting(More)