Title :
Acoustical evaluation of a prototype sector-vortex phased-array applicator
Author :
Umemura, Shin-ichiro ; Cain, Charles A.
Author_Institution :
Bioacoust. Res. Lab., Illinois Univ., Urbana, IL, USA
Abstract :
A prototype sector-vortex phased-array applicator for ultrasound hyperthermia was constructed and acoustically evaluated. The array transducer consists of special lead-titanate ceramic elements of 16 sectors and two tracks attached on a element is driven by a complementary pair of power MOSFETs at 750 kHz. An annular focal field approximated by the Mth order Bessel function is theoretically predicted to be formed when the array elements are driven with a phase distribution that rotates M (>
Keywords :
acoustic field; acoustic intensity; biomedical ultrasonics; biothermics; radiation therapy; ultrasonic transducers; 750 kHz; Bessel function; PbTiO/sub 3/ ceramic elements; acoustic field measurement; acoustical evaluation; annular focal field; array transducer; drive modes; focal acoustic power; multichannel membrane hydrophone; multidimensional field patterns; power MOSFETs; sector-vortex phased-array applicator; ultrasound hyperthermia; Acoustic measurements; Acoustic transducers; Applicators; Ceramics; Hyperthermia; Lead; Phased arrays; Prototypes; Ultrasonic imaging; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
