Dynamic B₀field detection by magnetic resonance navigators, and correction for multichannel reception and/or transmission RF coil configurations

摘要

In a method for calculating a B0 field map (a map of the basic magnetic field) in a magnetic resonance apparatus, a navigator pulse is emitted and navigator response resulting from the navigator pulse are detected in at least some channels of a multichannel RF coil array. Each channel of the multichannel RF coil array includes an RF coil and spatial information regarding the respective positions of the individual RF coils is made available to a processor, together with the multiple navigator signals. Using the spatial information obtained from the position of the RF coils that respectively detected the navigator response signals, a B0 field map is generated, without the need for spatial encoding the respective navigator response signals.

主权项

1. A method for generating a B0 field map, comprising:
activating a navigator pulse in a magnetic resonance data acquisition unit in which a basic magnetic field (B0 field) exists, said magnetic resonance data acquisition unit comprising a multichannel radio-frequency (RF) reception coil array, each channel in said multichannel RF coil array comprising an RF coil; detecting a navigator response signal in each of a plurality of channels in said multichannel RF array, thereby producing a plurality of navigator response signals; providing said plurality of navigator response signals to a computerized processor and also providing said computerized processor with localization information identifying respective positions of said coils in said multichannel RF array; and in said computerized processor, generating a B0 field map by spatially organizing said plurality of navigator response signals with said localization information respectively for the coils in said plurality of channels in which said plurality of navigator response signals were respectively detected, and making said B0 field map available in electronic form as a data file.