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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1109/TUFFC.2011.2138
|2 doi
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|a pubmed25n0751.xml
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|a (DE-627)NLM225353180
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|a (NLM)23443711
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Eames, Matthew D C
|e verfasserin
|4 aut
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|a FEA modeling of CMUT with membrane stand-off structures to enable selectable frequency-mode operation
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 11.07.2013
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|a Date Revised 27.02.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a A selectable, dual-frequency, capacitive micro- machined ultrasonic transducer (CMUT) designed for both high-frequency imaging and low-frequency therapeutic effect is presented. A validated finite element analysis (FEA) CMUT model was used to examine the performance of the proposed dual-frequency transducer. CMUT device simulations were used to design a hybrid device incorporating stand-off structures that divide a large, low-frequency membrane into smaller, high-frequency sub-membranes when the membrane is partially collapsed so that the stand-offs contact the substrate. In low-frequency operation, simulations indicated that the peak negative pressure achieved by the hybrid device, when biased by 30.0 VDC and excited by a 2-MHz signal with 30.0 V amplitude, exceeded 190 kPa, which is sufficient for microbubble rupture. Low-frequency mode bandwidth was 93% at a center frequency of 2.1 MHz. In the high-frequency mode of operation, the device was excited by 175 Vdc and 87.5 Vac, which generated a peak negative pressure of 247 kPa. Device center frequency was 44.1 MHz with a - 6-dB fractional bandwidth of 42%
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|a Letter
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|a Research Support, N.I.H., Extramural
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|a Membranes, Artificial
|2 NLM
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| 700 |
1 |
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|a Reck, Theodore J
|e verfasserin
|4 aut
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1 |
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|a Kilroy, Joseph P
|e verfasserin
|4 aut
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|a Hossack, John A
|e verfasserin
|4 aut
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|i Enthalten in
|t IEEE transactions on ultrasonics, ferroelectrics, and frequency control
|d 1986
|g 58(2011), 12 vom: 26. Dez., Seite 2749-52
|w (DE-627)NLM098181017
|x 1525-8955
|7 nnns
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| 773 |
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|g volume:58
|g year:2011
|g number:12
|g day:26
|g month:12
|g pages:2749-52
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|u http://dx.doi.org/10.1109/TUFFC.2011.2138
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