Design of the RF antenna for MRI

A RF antenna for MRI (magnetic resonance imaging) must emit very uniform electromagnetic fields over the imaging space as well as have a high efficiency in order to obtain high quality images. The authors have developed a program in which the moment method using a point-matching formulation is used. It is demonstrated, using the moment method, that the uniformity of the current distribution on the RF antenna can be improved by using adaptive series capacitors. This allows the adaptive dimensions of the multiturn RF antenna to be calculated to make the electromagnetic field over the imaging space uniform, on the assumption that uniform current flows on the antenna