Radio-frequency cardiography using a balanced 300MHz loop resonator: ventricular volume changes influence resonator efficiency at 7T

Standard MRI 300MHz loop resonators when placed on a human chest can serve to record variations related to the cardiac cycle with no influence of respiration on a network analyser. Radio-frequeny cardiography (rf CG) signals have been correlated with electrocardiographic (ECG) measurements and one rf-CG sensor was used to record a cardiac MR image at 7T. This technique proises to work well during free breathing and requires no tissue contact. The recorded variations may have to be considered for fine adjustment of feeding current phase shifts between multiple transmit resonators during B1-shimming. The results indicate that double-tuned resonators could serve as a unique sensor for rf-CG and detection of the MR signal for cardiac MRI.

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