Title :
Design and characterization of a 10 cm annular array transducer for high intensity focused ultrasound (HIFU) applications
Author :
Zanelli, C.I. ; Hennige, C.W. ; Sanghvi, N.T.
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
A large transducer to generate high intensity focused ultrasound (HIFU) for surgery via tissue ablation is described. Designed to address the need for therapeutic applications into deep tissue, the device operates at 1.25 MHz. In order to increase focus-to-entrance intensity ratios, the design was optimized to have a natural focal distance of 10 cm at f/1.0. Variable focus is achieved by phasing the array, and particular care was exercised to maximize the range of focal distances that can be achieved with a limited number of amplifiers and elements, using a constant-phase delay design. Design approach and tradeoffs are discussed, with emphasis on comparing theoretical calculations with test performance
Keywords :
acoustic intensity; biomedical ultrasonics; radiation therapy; surgery; ultrasonic focusing; ultrasonic transducer arrays; 1.25 MHz; 10 cm; 10 cm annular array transducer; 8 to 12 cm; array phasing; characterization; constant-phase delay design; deep tissue; design; focal distances; focus-to-entrance intensity ratios; high intensity focused ultrasound applications; large transducer; natural focal distance; surgery; therapeutic applications; tissue ablation; variable focus; Ablation; Acoustic arrays; Biological tissues; Biomedical applications of acoustic radiation; Biomedical transducers; Phased arrays; Surgery;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401959
