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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1109/TUFFC.2012.2358
|2 doi
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|a pubmed24n0732.xml
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|e rakwb
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|a eng
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|a Song, Junho
|e verfasserin
|4 aut
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|a Large improvement of the electrical impedance of imaging and high-intensity focused ultrasound (HIFU) phased arrays using multilayer piezoelectric ceramics coupled in lateral mode
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 02.01.2013
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|a Date Revised 19.11.2015
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|a published: Print
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|a Citation Status MEDLINE
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|a With a change in phased-array configuration from one dimension to two, the electrical impedance of the array elements is substantially increased because of their decreased width (w)-to-thickness (t) ratio. The most common way to compensate for this impedance increase is to employ electrical matching circuits at a high cost of fabrication complexity and effort. In this paper, we introduce a multilayer lateral-mode coupling method for phased-array construction. The direct comparison showed that the electrical impedance of a single-layer transducer driven in thickness mode is 1/(n²(1/(w/t))²) times that of an n-layer lateral mode transducer. A large reduction of the electrical impedance showed the impact and benefit of the lateral-mode coupling method. A one-dimensional linear 32-element 770-kHz imaging array and a 42-element 1.45-MHz high-intensity focused ultrasound (HIFU) phased array were fabricated. The averaged electrical impedances of each element were measured to be 58 Ω at the maximum phase angle of -1.2° for the imaging array and 105 Ω at 0° for the HIFU array. The imaging array had a center frequency of 770 kHz with an averaged -6-dB bandwidth of approximately 52%. For the HIFU array, the averaged maximum surface acoustic intensity was measured to be 32.8 W/cm² before failure
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|a Journal Article
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|a Research Support, N.I.H., Extramural
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|a Research Support, Non-U.S. Gov't
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|a Lucht, Benjamin
|e verfasserin
|4 aut
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|a Hynynen, Kullervo
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t IEEE transactions on ultrasonics, ferroelectrics, and frequency control
|d 1986
|g 59(2012), 7 vom: 01. Juli, Seite 1584-95
|w (DE-627)NLM098181017
|x 1525-8955
|7 nnns
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|g volume:59
|g year:2012
|g number:7
|g day:01
|g month:07
|g pages:1584-95
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|u http://dx.doi.org/10.1109/TUFFC.2012.2358
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