BIRDCAGE BODY COIL FOR PARALLEL TRANSMIT MRI

摘要

The invention relates to a birdcage resonator (109) for MR imaging, which birdcage resonator (109) surrounds an examination volume and comprises: a plurality of rungs (1-16) arranged in parallel to a longitudinal axis of the examination volume, each rung (1-16) comprising a rung capacitance (Crung),—two end rings arranged at the opposite ends of the rungs (1-16), each end ring comprising a plurality of ring capacitances (Cring), wherein each ring capacitance (Cring) interconnects a pair of adjacent rungs (1-16), each pair of adjacent rungs and interconnecting ring capacitances (Cring) forming a mesh of the birdcage resonator. The invention proposes that the ring capacitances (Cring) and the rung capacitances (Cring) are proportioned so that:—the birdcage resonator (109) has a plurality of resonant modes that are tuned to the same resonance frequency, and the meshes of the birdcage resonator (109) are electromagnetically coupled. Moreover, the invention relates to a MR device (101) comprising at least one RF coil arrangement for generating RF pulses within the examination volume and/or for receiving MR signals from a body (110) of a patient positioned in the examination volume, wherein the RF coil arrangement includes a birdcage resonator (109) with the specific tuning of the invention.

主权项

1. Birdcage resonator for MR imaging, which birdcage resonator surrounds an examination volume and comprises:
a plurality of N rungs arranged in parallel to a longitudinal axis of the examination volume, each rung comprising a rung capacitance, two end rings arranged at the opposite ends of the rungs (1-16), each end ring comprising a plurality of ring capacitances, wherein each ring capacitance interconnects a pair of adjacent rungs, each pair of adjacent rungs and interconnecting ring capacitances forming a mesh of the birdcage resonator, wherein the ring capacitances and the rung capacitances are proportioned so that: the birdcage resonator has a plurality of N resonant modes that are tuned to the same resonance frequency, the number of N resonant modes being equal to the number of rungs, and the individual meshes of the birdcage resonator are electromagnetically coupled.