New Dynamical Focusing Method for HIFU Therapeutic Applications
Abstract
New method for direct synthesis of dynamically focused acoustic field suitable for HIFU therapeutic applications is proposed. The method is based on the continuous cyclic generation of different focal patterns at optimal repetition frequency by simultaneous applying of "M" different frequency signals to "N" sectors of spherically shaped sectored transducer. The HIFU transducers comprising a spherical piezoceramic caps with back electrodes divided circumferentially into 4 regular shaped sectors were designed and tested. The sectors were simultaneously powered by 4 sinuses or burst drive signals with different frequencies from 6 dB bandwidth of the transducer. Calculation and modeling of acoustic field patterns for different transducer configurations and frequencies sets were performed. In vitro experiments on different tissues confirming the advantages of dynamical focusing method were performed.
- Publication:
-
9th International Symposium on Therapeutic Ultrasound: ISTU - 2009
- Pub Date:
- March 2010
- DOI:
- 10.1063/1.3367162
- Bibcode:
- 2010AIPC.1215..287R
- Keywords:
-
- biological effects of acoustic radiation;
- tissues;
- biological;
- thermal analysis;
- piezoelectric transducers;
- 87.50.Y-;
- 87.55.dh;
- 87.50.ux;
- 43.38.Hz;
- Biological effects of acoustic and ultrasonic energy;
- Tissue response;
- Therapeutic applications;
- Transducer arrays acoustic interaction effects in arrays