EM effects

Tool to Predict Unwanted EM Effects in an Medical Interventional Installation

The full-system installation of a Interventional Guided Therapy device in an multi-functional treatment room will depend on many parameters. The density of electronic and electrical devices is high. Especially in the area around the patient many devices are placed and operated in close proximity. From an electromagnetic (EM) perspective, unwanted EM interactions between these devices represent a safety risk to be accounted for. On one hand, final placements of cables and bundles are especially critical as they act as main actors in transporting unwanted energy through invisible circuits of parasitic. On the other hand, routing of interconnecting cables between multiple devices that are done by the clinical user can't be tightly controlled by design. A dedicated tool to quantify and predict these EM effects will enable interaction analysis and enhance safety and reliability of the full-system before its installation phase. The goal of this graduation project is to develop such an analytic tool to be used during the design phase and to draw general installation guidelines.

Project description
The graduation project is the result of a cooperation between the TU/e and Phillips. The purpose of the graduation project is to develop an electromagnetic (EM) tool that will be used in a R&D and the pre-installation phase to predict the presence of unwanted emissions within and external to the equipment related to cable placements and routing. The project will start with a theoretical investigation and modeling of the transfer impedance of diverse cables (including connectors). An existing tool will be used and improved to allow sensitivity analyses to be performed. These cable models will then be combined and adapted at bundle level. Results will be validated using a test bench available at Phillips. The overall transfer impedance of a bundle is used to translate its ability in catching and transporting external EM emissions. The next step will consist of analysing and modelling the interaction of these bundles with cabinets and other devices in the vicinity. The final tool will be validated via (in-situ) measurements.

Project organisation
The graduation project will be performed in closecooperation with the company Philips. Theoretical investigation, modelling as well as measurements on site are part of the project.