Ulrich-W. Thomale

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OBJECTIVE A procedure for acquisition, automated registration, and fusion of functional and anatomical magnetic resonance images is presented. Its accuracy is quantitatively assessed using a publicly available gold standard. A patient case is used to illustrate the technique's clinical usefulness in image-guided neurosurgery. MATERIALS AND METHODS Before(More)
Freehand placement of ventricular catheters (VC) is reported to be inaccurate in 10–40 %. Endoscopy, ultrasound, or neuronavigation are used in selected cases with significant technical and time-consuming efforts. We suggest a smartphone-assisted guiding tool for the placement of VC. Measurements of relevant parameters in 3D-MRI datasets in a patient cohort(More)
In cases of non-communicating hydrocephalus, a combined endoscopic third ventriculostomy (ETV) and tumor biopsy might be necessary. We suggest a computer-assisted planning procedure to perform ETV and biopsy via a single burr hole. In 15 patients with non-communicating hydrocephalus with a mass obstructing the Sylvian aqueduct, an ETV in parallel to(More)
The obstruction of ventricular catheters (VCs) is a major problem in the standard treatment of hydrocephalus, the flow pattern of the cerebrospinal fluid (CSF) being one important factor thereof. As a first approach to this problem, some of the authors studied previously the CSF flow through VCs under time-independent boundary conditions by means of(More)
Individual planning of the entry point and the use of navigation has become more relevant in intraventricular neuroendoscopy. Navigated neuroendoscopic solutions are continuously improving. We describe experimentally measured accuracy and our first experience with augmented reality-enhanced navigated neuroendoscopy for intraventricular pathologies.(More)
The flow pattern of the cerebrospinal fluid is probably the most important factor related to obstruction of ventricular catheters during the normal treatment of hydrocephalus. To better comprehend the flow pattern, we have carried out a parametric study via numerical models of ventricular catheters. In previous studies, the flow was studied under steady(More)
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