RF-signaalin siirtomenetelmiä vastaanottokeloille magneettikuvauslaitteen ja lineaarikiihdyttimen integraatiossa

摘要

MR-Linac is an integration of a magnetic resonance imaging system and a linear accelerator. It is used to deliver image-guided radiation therapy treatments for patients with cancer. It can deliver higher doses with better accuracy than traditional radiation therapy treatment tools.The goal of this thesis work was to develop a way to transmit a 63.87 MHz RF-signal through a radiation window in an MR-Linac receive coil. Transmitting the received signal through the radiation window would enable the development of MR-Linac receive coils with higher signal-to-noise ratio and reduced imaging time.When transmitting signals in the radiation window the transmission lines must be designed to have a minimal linear accelerator radiation attenuation and a sufficient radiation resistance. Three different transmission line methods where tested and compared: micro-coaxial cable, microstrip line and coplanar waveguide.The most promising results were achieved with the microstrip line. The coplanar waveguide was not usable for the application because of its strong coupling to the surrounding environment.