A method and apparatus for lesion or organ definition for the purpose of radiation treatment planning localization and treatment position verification. The connector system comprises a first flange, which can be connected to the exhaust pipe of the engine. The properties of the isotopically specified fluid may be monitored and adjusted to obtain the desired optical characteristics of the fluidic optical element. A handheld communication device includes an antenna system and the PCB assembly with the RF absorber for isolating the antenna system from self-interference in the device.