Quadrature RF surface coil for magnetic resonance imaging

摘要

A magnetic imaging apparatus generates a main magnetic field longitudinally through an image region and excites magnetic resonance in selected nuclei in a patient or subject disposed in the image area. The resonating nuclei generate radio frequency magnetic resonance signals which are received by a quadrature highpass ladder surface coil (D). The highpass ladder coil includes a central leg (34) having a capacitive element (CV) disposed symmetrically about a midpoint (44). A like number of additional legs (30, 32, 36, 38) are disposed parallel to and symmetrically on opposite side of the central leg. Side elements (40, 42) include capacitive elements (CA) which interconnect adjacent ends of each of the legs. The capacitive elements are disposed symmetrically about the midpoint (44) and are selected such that the coil supports at least two intrinsic resonant modes including an odd mode (50) and an even mode (52). The even mode is sensitive to fields in the plane of the coil and the odd mode is sensitive to fields in a plane orthogonal to the coil.