The simulation of bidirectional ultrasound hyperthermia treatments of neck tumors
AuthorTu, Jidong, 1964-
AdvisorTharp, Hal S.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractThe temperature distributions produced in neck tumors by using either a single, scanned transducer (a unidirectional scan) or two separate transducers whose axis were perpendicular (a bidirectional scan) were simulated. The three dimensional neck model included separate anatomical regions for the normal neck muscle tissue, the tumor, the spinal column and the trachea. The effects of variations in the transducer frequency and f-number, the tumor size and location, and the normal and tumor blood perfusion rates were established. The results indicate that the best temperature distributions will be produced by bidirectional, scanned, 2 Mhz ultrasound beams whose powers are modulated as a function of position. The temperature distributions from such bidirectional scans were significantly better than those of unidirectional scans. Modulation of power as a function of position during scanning further improved the temperature distributions. These results can be used to guide treatments of neck tumors.