Title :
Thermal dosimetry studies of the Helios ultrasound hyperthermia system
Author :
Lindsley, K. ; Sneed, P. ; Stauffer, P.R. ; Chin, R. ; Phillips, T.L. ; Seppi, E. ; Shapiro, E. ; Henderson, S.
Author_Institution :
Dept. of Radiat. Oncology, California Univ., San Francisco, CA, USA
Abstract :
SAR (specific absorption rate) distributions from the Helios, a multitransducer ultrasound hyperthermia system, were characterized in a tissue-equivalent phantom. Well-localized heating (FWHM of 3.5 cm) was obtained at the focal depth when the three inner transducer rings were set to converge at the focal plane. It was also possible to produce a well defined donut-shaped SAR pattern by opening the ring diameters. In-vivo trials in porcine thigh muscle, using the three inner transducer ring at a frequency of 540 kHz, showed an ability to achieve therapeutic temperatures at depths of 10 to 11 cm.<>
Keywords :
biomedical equipment; biomedical ultrasonics; biothermics; dosimetry; radiation therapy; 10 to 11 cm; 540 kHz; Helios ultrasound hyperthermia system; donut-shaped SAR pattern; focal depth; focal plane; in vivo trials; inner transducer rings; multitransducer; porcine thigh muscle; ring diameters; specific absorption rate distributions; therapeutic temperatures; thermal dosimetry; tissue-equivalent phantom; well localised heating;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.95213
