A new phased-array applicator geometry for deep localized hyperthermia is presented. The array consists of rectangular transducer elements forming a section of a cylinder that conforms to the body portals in the abdominal and pelvic regions. Focusing and scanning properties of the cylindrical-section array are investigated in homogeneous lossy media using appropriate computer simulations. The characteristic focus of this array is shown to be spatially limited in both transverse and longitudinal directions with intensity gain values suitable for deep hyperthermia applications. The ability of the cylindrical-section phased array to generate multiple foci using the field conjugation method is examined. The effect of the grating lobes on the power deposition pattern of the scanned field is shown to be minimal. Steadystate temperature distributions are simulated using a three-dimensional (3-D) thermal model of the normal tissue layers surrounding a tumor of typical volume. Finally, the advantages and the limitations of this array configuration are discussed.
|Original language||English (US)|
|Number of pages||12|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|State||Published - Sep 1988|
Bibliographical noteFunding Information:
Manuscript received July 24, 1987: revised December 21. 1987. This work was supported in pan by the National Institute of Health under Grant CA 44124. in pan by the Hitachi Central Research Laboratory, and in part by the National Center of Supercomputer Applications under Grant ECS 87000 1.