Patent ID: 8970217
Filing Date: 2015-03-03
Classification: G01R

Abstract:
1. A magnetic resonance imaging system, comprising: at least one receive antenna, oriented to sense a radio frequency field from an emission region; said radio frequency field comprising a superposition of a narrowband oscillating signal of interest from the emission region which is phase coherent over a time period, and a broadband interfering signal from the emission region which is not phase coherent over the time period, having at least one component which overlaps a frequency range of the narrowband oscillating signal of interest; a digital processor, configured to reduce an interference of the superposed broadband interfering signal with the narrowband oscillating signal of interest based on at least a time-correlated model of the interfering signal analyzing at least phase coherency; and an output, configured to present the signal of interest having reduced interference to an image processing unit, wherein at least one of: the signal of interest is at least partially circularly polarized, the interfering signal is at least partially linearly polarized, and the at least one antenna comprises at least two antenna elements configured to have a differential response pattern to circularly polarized and linearly polarized radio frequency fields within the narrow band; the signal of interest is predominantly circularly polarized, and the at least one interfering signal comprises at least one linearly polarized component, the digital processor being configured to receive at least two signals representing a respective vector sum of the signal of interest and the interfering signal, projected in at least two directions; and to analyze the at least two received signals, to separate out the signal of interest from the at least one interfering signal based on a spatial difference therebetween; and the digital processor is further configured to estimate a vector direction of the at least one interfering signal by averaging data over a significant fraction of an oscillation period of the oscillating signal of interest.