| Abstract | Fantom je materijal koji ima iste karakteristike kao biološko tkivo i ljudsko tijelo te se zbog toga koristi za razvoj implantabilnih uređaja za prijenos signala ljudskim tijelom. Kapacitivna metoda prijenosa signala je metoda kod koje se povratni put zatvara kroz okolinu. Za pripremu određenog fantoma potrebno je poznavati električna svojstva tkiva da bi se moglo analizirati kako određeno tkivo reagira na električne stimulacije i u skladu s tim, pripremiti odgovarajući fantom. Relativna permitivnost i vodljivost su svojstva tkiva koja ovise o vrsti tkiva, frekvenciji i temperaturi. Postoji više vrsta fantoma, a po sastavu se dijele na tekuće, polukrute, krute i životinjske fantome zbog čega se može naći velik broj recepata za pripremu fantoma koji su prilagođeni različitim strukturama, tkivima i frekvencijama Mjerni sustav ovog diplomskog rada sastoji se od baterijski napajanih odašiljača i prijamnika, analizatora mreža, dvije vrste fantoma te tri vrste elektroda. Mjerenja su provedena na dva tekuća fantoma i dva životinjska fantoma za sedam frekvencija. Analizirao se utjecaj korištene mjerne opreme, odnosno razlika mjerenja s baterijskim prijamnikom i prijenosnim analizatorom, razlika između mjerenja s bakrenom izoliranom i neizoliranom referentnom elektrodom te medicinskom elektrodom kao i utjecaj udaljenosti između odašiljačkih i prijamnih elektroda na prijenos signala. |
| Abstract (english) | A phantom is a material that has the same characteristics as biological tissue and the human body, that is used for the development of implantable devices for transmitting signals through the human body. Capacitive method of signal transmission is a method where the return path is closed through the environment. To prepare a particular phantom, it is necessary to know the electrical properties of the tissue, to be able to analyze how the particular tissue reacts to electrical stimulation and, accordingly, to prepare an appropriate phantom. Relative permittivity and conductivity are tissue properties related to tissue type, frequency, and temperature. There are several types of phantoms, and according to their composition, they are divided into liquid, semi-solid, hard, and animal phantoms. These are reasons why you can find many recipes for the preparation of phantoms that are adapted to different structures, tissues, and frequencies. The measurement system of this thesis consists of battery-powered transmitters and receiver, network analyzer, two types of phantoms and three types of electrodes. Measurements were performed on two liquid phantoms and two animal phantoms for seven frequencies. The influence of the used measuring equipment was analyzed, that is, the difference between measurements with a battery receiver and a network analyzer, the difference between measurements with a copper insulated and non-insulated reference electrode and a medical electrode, as well as the influence of the distance between the transmitting and receiving electrodes. |
