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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1109/TUFFC.2013.6644730
|2 doi
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|a (NLM)24158282
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|a DE-627
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|e rakwb
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|a eng
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|a Smith, Peter R
|e verfasserin
|4 aut
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|a Width-modulated square-wave pulses for ultrasound applications
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|c 2013
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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 02.06.2014
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|a Date Revised 25.10.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a A method of output pressure control for ultrasound transducers using switched excitation is described. The method generates width-modulated square-wave pulse sequences that are suitable for driving ultrasound transducers using MOSFETs or similar devices. Sequences are encoded using an optimized level-shifted, carrier-comparison, pulse-width modulation (PWM) strategy derived from existing PWM theory, and modified specifically for ultrasound applications. The modifications are: a reduction in carrier frequency so that the smallest number of pulses are generated and minimal switching is necessary; alteration of a linear carrier form to follow a trigonometric relationship in accordance with the expected fundamental output; and application of frequency modulation to the carrier when generating frequency-modulated, amplitude- tapered signals. The PWM method permits control of output pressure for arbitrary waveform sequences at diagnostic frequencies (approximately 5 MHz) when sampled at 100 MHz, and is applicable to pulse shaping and array apodization. Arbitrary waveform generation capability is demonstrated in simulation using convolution with a transducer's impulse response, and experimentally with hydrophone measurement. Benefits in coded imaging are demonstrated when compared with fixed-width square-wave (pseudo-chirp) excitation in coded imaging, including reduction in image artifacts and peak side-lobe levels for two cases, showing 10 and 8 dB reduction in peak side-lobe level experimentally, compared with 11 and 7 dB reduction in simulation. In all cases, the experimental observations correlate strongly with simulated data
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Cowell, David M J
|e verfasserin
|4 aut
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1 |
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|a Freear, Steven
|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 60(2013), 11 vom: 11. Nov., Seite 2244-56
|w (DE-627)NLM098181017
|x 1525-8955
|7 nnns
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| 773 |
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|g volume:60
|g year:2013
|g number:11
|g day:11
|g month:11
|g pages:2244-56
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|u http://dx.doi.org/10.1109/TUFFC.2013.6644730
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