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Hyperthermia system combined with a magnetic resonance imaging unit
Author(s) -
Delannoy J.,
LeBihan D.,
Hoult D. I.,
Levin R. L.
Publication year - 1990
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596477
Subject(s) - imaging phantom , magnetic resonance imaging , biomedical engineering , materials science , hyperthermia , nuclear magnetic resonance , image resolution , medical imaging , nuclear medicine , physics , optics , medicine , radiology , meteorology
Magnetic resonance imaging (MRI) has recently been proposed as a method to monitor, noninvasively, temperature, blood flow, and cell metabolism during oncologic hyperthermia (HT). To heat and “image” simultaneously, it is necessary to combine a HT device and a MRI unit. As a demonstrative example of the problems associated with implementing such a system, a mini‐annular phased array hyperthermia applicator was combined with a 0.5‐T whole body MRI unit. With the aid of filters, baluns, and switches, the HT applicator and the MRI unit were made compatible. The overall system was tested using a muscle‐equivalent, cylindrically shaped polyacrylamide gel phantom. No interference between the HT device and the MRI unit was observed. Noninvasive temperature images, with a resolution better than 1 °C/cm, were obtained from images of molecular diffusion recorded before and during heating.