Vincent O. Boer1, Jan Ole Pedersen2, Hørður Andreasen3, Sadri Güler1,4, Vitaliy Zhurbenko3, Jason Stockmann5, Irena Zivkovic6, and Esben Thade Petersen1,4
1Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Hvidovre, Denmark, 2Philips Healthcare, Copenhagen, Denmark, 3Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark, 4Section for Magnetic Resonance, DTU Health Tech, Technical University of Denmark, Kongens Lyngby, Denmark, 5Athinoula A Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 6Electrical Engineering department, Technical University of Eindhoven, Eindhoven, Netherlands
1Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Hvidovre, Denmark, 2Philips Healthcare, Copenhagen, Denmark, 3Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark, 4Section for Magnetic Resonance, DTU Health Tech, Technical University of Denmark, Kongens Lyngby, Denmark, 5Athinoula A Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 6Electrical Engineering department, Technical University of Eindhoven, Eindhoven, Netherlands
Shielded coaxial RF coils show very low coupling between elements, and are ideal for building transmit-receive arrays. In this work we extended a 6 element transceive array with B0 shim capabilities.
Figure 3 – The 6 channel transceive array facilitates good coverage over the cervical spine (a), although there is a large B0 background field present (b). The transceive array with B0 shim capabilities can provide additional B0 fields (c, sagittal). The six channels show non-overlapping RF fields (d) as well as complementary B0 fields (e) even for 1A current.
Figure 1 – Extension of RF coils with DC circuits. In a traditional loop coil (a) the conductor is broken up with capacitors whereas (b) shielded coaxial coils (SSC) do not require this. Adding a DC path (red) therefore typically requires the addition of several RF chokes in a traditional coil (c) compared to only two on an SSC coil (d). Addition of RF chokes is only required on the feeding points (e) and not limited additional space is needed on the coil array (f). Note the coil array shows virtually no coupling between the elements despite lack of overlap between elements (data not shown).