Hanne Tiesler

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We discuss the use of stochastic collocation for the solution of optimal control problems which are constrained by stochastic partial differential equations (SPDE). Thereby the constraining SPDE depends on data which is not deterministic but random. Assuming a deterministic control, randomness within the states of the input data will propagate to the states(More)
The assessment of biodurability of man-made vitreous fibers is essential to the limitation of health hazards associated with human exposure to environments in which respirable fibers are present. In vitro acellular systems provide effective test methods of measuring fiber solubility provided care is taken to select the most suitable solvent and test(More)
High intensity focused ultrasound (HIFU) is a promising technology for cancer treatment. Thereby, heating due to the focusing of the ultrasound non-invasively destroys the tumors. At the present state, the method is clinically restricted to uterine fibroids, adenomyosis, bone metastasis and prostate cancer. In abdominal organs as e.g. the liver, the motion(More)
It is a challenging task to plan a radiofrequency (RF) ablation therapy to achieve the best outcome of the treatment and avoid recurrences at the same time. A patient specific simulation in advance that takes the cooling effect of blood vessels into account is a helpful tool for radiologists, but this needs a very high accuracy and thus high computational(More)
Percutaneous radiofrequency (RF) ablation is becoming a standard minimal invasive procedure for treatment of primary liver tumors. In clinical practice, knowledge about geometry and expected size of the coagulation is essential to prevent local tumor recurrence. Particularly the heat-sink effects of large vessels in the vicinity of the electrode may lead to(More)
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