Dynamic modification of RF array coil/antenna impedance

摘要

A magnetic resonance (MR) system (10) minimizes noise for modes of an array of coils (281, 282, . . . , 28n). The system (10) includes an array of coils (281, 282, . . . , 28n) which share impedance. A plurality of preamplifiers (301, 302, . . . , 30n) receive a plurality of signals from the array of coils (281, 282, . . . , 28n), and a plurality of matching circuits (321, 322, . . . , 32n) impedance match the array of coils (281, 282, . . . , 28n) to the plurality of preamplifiers (301, 302, . . . , 30n). A plurality of receivers (361, 362, . . . , 36n) oversample the plurality of preamplified signals at a plurality of different match values. Thereafter, a plurality of separate images may be reconstructed from the oversampled data, each image corresponding to a particular match value. Finally, the image with the highest SNR may be selected.

主权项

1. A magnetic resonance (MR) system with noise figure minimization for modes of an array of coils, said system comprising:
an array of coils which share impedance; a plurality of preamplifiers receiving a plurality of signals from the array of coils; a plurality of matching circuits impedance matching the array of coils to the plurality of preamplifiers; and, a plurality of receivers oversampling the plurality of preamplified signals at a plurality of different match values.