Ronald D. Watkins1,
Caroline Jordan1, 2, Michael Muelly1, Garry
E. Gold1
1Radiology,
Stanford University, Stanford, CA, United States; 2Bioengineering,
Stanford University, Stanford, CA, United States
Two concentric birdcage volume coils are combined for operation at 1H Proton and 23Na Sodium. By using a low pass coil for 1H and a high pass coil for Sodium resonant coupling is avoided. Higher order resonant modes of each coil sections do not overlap resulting in high isolation. Some retuning of the 1H coil was needed for proximity effects. No frequency traps or special decoupling circuit were needed. The sodium coil was constructed of heavy copper tubing and produced nearly a factor of 2 SNR improvement over previous for end ring designs.