At clinical field strengths, the contribution of coil noise is often characterized by the Q-ratio, the ratio of the loaded Q and unloaded Q. Because of the inconsistent contribution of radiation loss and frequency drift in unloaded and loaded cases, it is difficult to characterize the body noise dominance of a dipole antenna by conventional Q ratio at 7T. Here we propose a new approach using a measure of Q when a dipole antenna is well shielded. The shielded/loaded Q ratio estimates the relative noise contribution from coil loss, similar to unloaded/loaded Q ratio for surface coil at low frequencies.
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