Abstract #2349
Monitoring local heating around an interventional MRI probe with RF radiometry
Mehmet Arcan Erturk 1,2 , AbdEl-Monem M. El-Sharkawy 2 , and Paul A. Bottomley 1,2
1
Department of Electrical and Computer
Engineering, Johns Hopkins University, Baltimore,
Maryland, United States,
2
Department
of Radiology, Johns Hopkins University, Baltimore,
Maryland, United States
Active interventional loopless antenna may heat locally
during MRI, or when they are used for thermal ablation
therapy. Here we develop a novel MRI-less thermometry
method employing the internal MRI detector as an RF
radiometer at the 3T MRI frequency. Local temperature is
monitored by a loopless antenna, based on the magnitude
of its RF noise voltage. The radiometer is calibrated in
a gel phantom to an accuracy of <0.3C at two
measurements/sec. The radiometer tracks the temperature
probe with high local sensitivity. RF radiometry
provides thermometry without MRIs confounding factors
or the need for additional sensor probes.
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