New MRI coil and resonators are disclosed based solely on superconducting
inductive element and built-in capacitive elements as well as hybrid
superconducting-metal inductive and capacitive elements having superior
SNR. Single and multiple small animal MRI imaging units are also
disclosed including one or more resonators of this invention surrounding
one or more small animal cavities. Methods for making and using the MRI
coils and/or arrays are also disclosed.