A variable diameter resonator for high field proton and sodium musculoskeletal MRI

A variable-diameter birdcage resonator has been constructed for sodium imaging of the knee at 7 Tesla (78.85 MHz) in order to optimize sensitivity for different patient sizes. Anatomical proton data are acquired using two microstrip lines (tuned to 298 MHz) mounted on the inside of the shield of the variable diameter birdcage. The diameter of the birdcage can be varied between 13.5 and 18 cm. Co-registered proton and sodium images have been acquired from three volunteers ranging from a large male subject to a small female one.

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