Noise variance of an RF receive array reflects respiratory motion: a novel respiratory motion predictor

Conventional methods to detect patient motion are based either on an external device, e.g. respiratory belt, or MR acquisition, i.e. navigator. An alternative technique has been proposed which monitors RF coil's impedance changes induced by the patient motion. However, this technique requires additional hardware. Here, we propose to detect the motion induced impedance variation by means of noise measurements. Using clinical MR systems we demonstrated the feasibility of the RF coil's thermal noise variance to detect respiratory motion. Moreover, noise covariance matrix of an array of coils contains spatial information which can potentially be used for motion prediction.

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