Cavity resonator for magnetic resonance systems

A radio frequency (RF) device for magnetic resonance imaging, the RF device comprising:

• a resonator coil having two or more separable sections. the sections adapted to be disposed circumferentially about an axis to form the coil, the coil defining a cavity therethrough,
• each of the two or more sections including at least one transmission line segment,
• the two or more sections being reactively coupled when disposed to form the coil, the reactive coupling configured such that excitation energy applied to any one of the two or more sections causes excitation energy in the remaining sections,
• the two or more sections adapted to form an electromagnetic shield when disposed to form the coil,
• wherein the at least one transmission line segment comprises an inner conductor and an outer shield portion, the outer shield portion being formed of a non-magnetic conductive material, and
• wherein at least one separable section includes an outer shield portion which overlaps an outer shield portion of an adjacent separable section.