Journal ArticleDOI
Direct computation of ultrasound phased-array driving signals from a specified temperature distribution for hyperthermia
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TLDR
A method that obtains ultrasound hyperthermia applicator phased-array element driving signals from a desired temperature distribution is presented and the linear algebraic structure of the method allows rapid calculation of both the phased- array driving signals and an approximate temperature field response.Abstract:
A method that obtains ultrasound hyperthermia applicator phased-array element driving signals from a desired temperature distribution is presented. The approach combines a technique which computes array element driving signals from focal point locations and intensities with a technique which calculates focal point locations and power deposition values from temperature requirements. Temperature specifications appear as upper and lower bounds within the tumor volume, and a focal point placement algorithm chooses focal patterns capable of achieving the temperature range objective. The linear algebraic structure of the method allows rapid calculation of both the phased-array driving signals and an approximate temperature field response. Computer simulations verify the method with a spherical section array (SSA) for a variety of temperature specifications and blood perfusion values. The scheme applies to any phased-array geometry. >read more
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References
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Journal ArticleDOI
Multiple-focus ultrasound phased-array pattern synthesis: optimal driving-signal distributions for hyperthermia
Emad S. Ebbini,Charles A. Cain +1 more
TL;DR: A method for computing array element amplitude and phase distributions for direct synthesis of multiple-focus field patterns using ultrasonic phased arrays is shown to be capable of producing desired field levels at a set of control points in the treatment volume, providing a powerful tool for hyperthermia treatment planning.
Journal ArticleDOI
Concentric-Ring and Sector-Vortex Phased-Array Applicators for Ultrasound Hyperthermia
TL;DR: In this article, a thermal model based on the bioheat equation is also used to predict temperature distributions in volumes where important thermal parameters, particularly blood flow, are varied, and power absorption patterns in Iossy media for this class of applicators are analyzed numerically allowing a quantitative evaluation of both advantages and limitations of this approach.
Journal ArticleDOI
Sound field calculation for rectangular sources
K.B. Ocheltree,L.A. Frizzel +1 more
TL;DR: A method is presented for calculation of the sound field from a rectangular continuous-wave source surrounded by a plane grid baffle, which shows that the transverse pressure distribution is more uniform in the near-field of the square source.
Journal ArticleDOI
Temperature measurements during ultrasound hyperthermia.
Kullervo Hynynen,D. K. Edwards +1 more
TL;DR: It was found that probes with diameters equal to or greater than 1/2 of the square root of the wavelength (lambda) scatter and reflect the waves, and thus distort the field significantly and temperature measurement errors caused by temperature sensing probes were investigated.
Journal ArticleDOI
Optimization of the intensity gain of multiple-focus phased-array heating patterns.
Emad S. Ebbini,Charles A. Cain +1 more
TL;DR: Simulation results indicate that multiple-focus scanning not only provides an alternative to single- focus scanning, but also achieves better localization in the heating pattern.
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