NDLI: Real-time dynamic focusing through tissue inhomogeneities during hyperthermia treatments with phased arrays

Content Provider	IEEE Xplore Digital Library
Author	VanBaren, P. Seip, R. Ebbini, E.S.
Copyright Year	1994
Abstract	A needle probe hydrophone array made of discrete PVDF elements has been designed and fabricated at our laboratory. Such a probe can obtain complex acoustic pressure measurements at or near the tumor site. To extend the region over which these measurements may be used to focus a phased array, a real-time measurement system is needed, along with a method of extrapolating the data to points other than those measured by the probe. We describe such a real-time dynamic focusing algorithm that uses measurements from the full-set of hydrophone array elements in estimating the bearing and range of the elements of the transmitting array. In this way, a measurement of the radius of curvature of the wave front due to an array element is made along the span of the array, which extends the region of reliable refocusing. An outline of the steps of the refocusing algorithm along with simulation and experimental results are given. Finally, we describe the architecture of a real-time system for refocusing currently being designed for this purpose
Starting Page	1815
Ending Page	1819
File Size	430227
Page Count	5
File Format	PDF
ISBN	0780320123
DOI	10.1109/ULTSYM.1994.401943
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-10-31
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Biomedical applications of acoustic radiation Tumors Hydrophones Acoustic arrays Phased arrays Pressure measurement Biomedical transducers Acoustic beam focusing Piezoelectric transducers Hyperthermia
Content Type	Text
Resource Type	Article

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