Wireless physiological gating via reflectometry and secondary device

A system configured to wirelessly transfer data from a secondary device to a primary device, the system comprising:

• circuitry and an antenna/primary coil of the primary device configured to wirelessly receive an analog physiological signal of interest from the secondary device, the antenna of the primary device being coupled in near-field with a resonant antenna of the secondary device, and the secondary device having circuitry configured to vary an impedance of or otherwise vary a tuning of the resonant antenna of the secondary device so as to influence an electromagnetic environment or tuning of the antenna of the primary device, the change in electromagnetic environment being detected by the circuitry within the primary device and corresponding to the analog physiological signal of interest from the secondary device.

A system to wirelessly transfer data from an electrocardiogram (ECG) device to a magnetic resonance imaging (MRI) machine, the system comprising:

• circuitry and an antenna/primary coil of the MRI machine configured to wirelessly receive an analog physiological signal of interest from the ECG device, the antenna of the MRI machine being coupled in near-field with a resonant antenna of the ECG device, and the ECG device having circuitry configured to vary an impedance of or otherwise vary a tuning of the resonant antenna of the ECG device so as to influence an electromagnetic environment or a tuning of the antenna of the MRI machine, the change in electromagnetic environment being detected by the circuitry within the MRI machine and corresponding to the analog physiological signal of interest from the ECG device, wherein the MRI machine comprises circuitry and one or more antenna configured to probe the electromagnetic environment and measure changes in the electromagnetic environment corresponding to the analog physiological signal of interest from the ECG device.