NDLI: Non-circular multi-sector split-focus transducer for coagulation therapy

Content Provider	IEEE Xplore Digital Library
Author	Umemura, S. Sasaki, K. Kawabata, K. Azuma, T.
Copyright Year	2000
Description	Author affiliation: Central Res. Lab., Hitachi Ltd., Kokubunji, Japan (Umemura, S.)
Abstract	The split-focus approach has a potential to substantially improve the throughput of coagulation HIFU treatment through multiplying the volume of the focal zone without forming unwanted foci either in front or behind the focal plane. The ideal, theoretically simplest split focal field can be generated from a geometrically focused transducer with a circular aperture uniformly divided into many sectors. However, for an intracavitary transducer, a non-circular shape of aperture is usually needed to have a necessary aperture area within its allowed size. A theoretical consideration how to divide the aperture into many sectors for forming a relatively uniform temperature distribution in the focal zone was developed. A transrectal therapeutic transducer at 3 MHz with a rectangular aperture of 20/spl times/40 mm divided into eight sectors with,a geometric focal length of 30 mm was designed and fabricated based on the above consideration followed by the computer simulation of transient temperature distribution. It has been confirmed that significantly large lesion can be created even without tissue boiling if a spilt focus method is used with properly designed large number of sectors.
Starting Page	1409
Ending Page	1412
File Size	363956
Page Count	4
File Format	PDF
ISBN	0780363655
ISSN	10510117
DOI	10.1109/ULTSYM.2000.921586
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coagulation Medical treatment Apertures Temperature distribution Heating Tellurium Throughput Shape Ultrasonic transducers Frequency estimation
Content Type	Text
Resource Type	Article

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