Browsing by Subject "Temperature control"
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Item Computational modeling and real-time control of patient-specific laser treatment of prostate cancer(2008-05) Fuentes, David Thomas A., 1981-; Oden, J. Tinsley (John Tinsley), 1936-Hyperthermia based cancer treatments delivered under various modalities have the potential to become an effective option to eradicate the disease, maintain functionality of infected organs, and minimize complications and relapse. Moreover, hyperthermia therapies are a form of minimally invasive cancer treatment which are key to improving the quality of life post-treatment. Many modalities are available for delivering the heat source. However, the ability to control the energy deposition to prevent damage to adjacent healthy tissue is a limiting factor in all forms of thermal therapies, including cryotherapy, microwave, radio-frequency, ultrasound, and laser. The application of a laser heat source under the guidance of real-time treatment data has the potential to provide unprecedented control over the temperature field induced within the biological domain. The computational infrastructure developed in this work combines a computational model of bioheat transfer based on a nonlinear version of the Pennes equation for heterogeneous media with the precise timing and orchestration of the real-time solutions to the problems of calibration, optimal control, data transfer, registration, finite element mesh refinement, cellular damage prediction, and laser control; it is an example of Dynamic-Data-Driven Applications System (DDDAS) in which simulation models interact with measurement devices and assimilates data over a computational grid for the purpose of producing high-fidelity predictions of physical events. The tool controls the thermal source, provides a prediction of the entire outcome of the treatment and, using intra-operative data, updates itself to increase the accuracy of the prediction. A precise mathematical framework for the real-time finite element solution of the problems of calibration, optimal heat source control, and goal-oriented error estimation applied to the equations of bioheat transfer is presented. It is demonstrated that current finite element technology, parallel computer architecture, data transfer infrastructure, and thermal imaging modalities are capable of inducing a precise computer controlled temperature field within a biological domain. The project thus addresses a set of problems falling in the intersection of applied mathematics, imaging physics, computational science, computer science and visualizations, biomedical engineering, and medical science. The work involves contributions in the three component areas of the CAM program; A, Applicable Mathematics; B, Numerical Analysis and Scientific Computing; and C, Mathematical modeling and Applications. The ultimate goal of this research is to provide the medical community a minimally invasive clinical tool that uses predictive computational techniques to provide the optimal hyperthermia laser treatment procedure given real-time, patient specific data.Item Sixteen-channel temperature controller(Texas Tech University, 2002-12) Nallamudi, Sarath BabuTemperature is a widely measured quantity in the industry. Accurate and repeatable temperature measurement and control are critical to product quality and uniformity in many modem semiconductor manufacturing processes. Different techniques to measure the temperature are studied. One of such technique to measure temperature with a thermistor whose resistance reduces with the increase in temperature is considered. A circuit is developed to control the temperature in 16 channels and to measure the temperature in all 16 channels each time the temperature is controlled in one channel. The circuit is controlled from the Micro controller named BS2IC. A 6" wafer is processed and a pattern is developed on it in order to glue resistors to control the temperature and to glue thermistors to measure the temperature. The Temperature controller is then connected to this wafer and the controller is tested for its functionality.Item Temperature control and modeling of rapid thermal processing(2005) Cho, Wonhui; Edgar, Thomas F.