Abstract #0433
Radio-frequency cardiography using a balanced 300MHz loop resonator: ventricular volume changes influence resonator efficiency at 7T
Friedrich Wetterling 1,2
1
Faculty of Engineering, Trinity College, the
University of Dublin, Dublin, Leinster, Ireland,
2
Tomometrics
Ltd., Dublin, Leinster, Ireland
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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