A variable diameter resonator for high field proton and sodium musculoskeletal MRI
Sebastian Arnold Aussenhofer 1 , Paul de Bruin 1 , and Andrew Webb 1
Radiology Leiden University Medical Center,
C.J. Gorter Center for High Field MRI, Leiden,
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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