Asymmetric radio frequency coil for magnetic resonance imaging

摘要

An NMR excitation coil includes a plurality of conductive elements having varying lengths and arranged parallel to one another to define cylindrical volume. A planar loop connects one end of the conductive element together with the conductive segments between pairs of the conductive elements. A non-planar loop connects the other ends of the conductive elements with a series of conductive segments between pairs of the conductive elements. Some of the non-planar loop segments are formed by a coaxial cable having a central conductor connected between ends of two conductive elements and a shield the electrically floats. A separate capacitor is located in those segments of the two loops that are not formed by coaxial cables. Each capacitor has a capacitance which is defined by the inductance of the conductive elements connected to that capacitor.