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MRI monitoring of interstitial microwave‐induced heating and thermal lesions in rabbit brain in vivo
Author(s) -
Moriarty John A.,
Chen Julian C.,
Purcell Carrie M.,
Ang Lee C.,
Hinks R. Scott,
Peters Robert D.,
Henkelman R. Mark,
Plewes Donald B.,
Bronskill Michael J.,
Kucharczyk Walter
Publication year - 1998
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880080125
Subject(s) - rabbit (cipher) , in vivo , pathology , nuclear magnetic resonance , medicine , microwave , biomedical engineering , materials science , biology , physics , computer science , microbiology and biotechnology , quantum mechanics , computer security
The purpose of this experiment was to use MRI to monitor microwave heating and thermal damage of brain tissue in vivo. Interstitial microwave antennas were implanted into the cerebral hemispheres of seven anesthetized rabbits. Variable power of 30 to 100 W was applied for periods of 5 to 15 minutes and tissue temperature was monitored continuously. MR images were obtained throughout the procedure at 20‐second intervals, using a spoiled gradient‐echo sequence, without significant artifact. Magnitude, phase, and complex difference images all demonstrated temperature‐related signal changes during heating. The findings were better visualized on the phase and complex difference images. Phase difference image analysis revealed an approximately linear relationship between phase change and temperature. Post‐treatment thermal lesions measured up to 2.0 cm in size on pathologic specimens and exhibited a zonal pattern on spin‐echo MR images.