Parameter optimization of pulse compression in ultrasound imaging systems with coded excitation

Behar, V.; Adam, Dan

doi:10.1016/j.ultras.2004.02.020

Cited by 51 publications

(27 citation statements)

References 8 publications

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“…The optimisation of excitation signals to reduce peak width and sidelobe power has been discussed in detail [13] whilst optimising the excitation bandwidth for different transducers has also been investigated [14].…”

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confidence: 99%

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Quinary excitation method for pulse compression ultrasound measurements

Cowell

Freear

2008

Ultrasonics

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A novel switched excitation method for linear frequency modulated excitation of ultrasonic transducers in pulse compression systems is presented that is simple to realise, yet provides reduced signal sidelobes at the output of the matched filter shows improvements in signal to sidelobe noise power in the order of 7 to 8 dB.The reported quinary switched method for linear frequency modulated excitation provides improved performance compared to pesudo chirp excitation without the need for high performance excitation amplifiers.

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confidence: 99%

“…When the LFM excitation signal is applied to the transmitting transducer, the resulting RF waveform [13] at the receiver is…”

Section: Ultrasound Channel Effectsmentioning

confidence: 99%

Quinary excitation method for pulse compression ultrasound measurements

Cowell

Freear

2008

Ultrasonics

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“…Pulse compression is a technique that has been employed in both RADAR 1, 2 and medical ultrasound 3,4 . It is used to transmit large amounts of energy over a long period of time without sacrificing temporal resolution.…”

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confidence: 99%

Through-container measurement of acoustic signatures for classification/discrimination of liquid explosives (LEs) and precursor threat liquids

et al. 2008

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Work at the Pacific Northwest National Laboratory has demonstrated that ultrasonic property measurements can be effectively employed for the rapid and accurate classification/discrimination of liquids in small, carryon, standard "stream-of-commerce" containers. This paper focuses on a set of laboratory measurements acquired with the PNNL prototype device as applied to several types of liquids (including threat liquids and precursor chemicals) to the manufacture of LEs in small commercially available plastic containers.

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“…A hypothesized imaging scheme could exploit any differences in the response to these excitations. Chirped excitation has been investigated in order to increase the signal-to-noise ratio (SNR) with [13][14][15] and without [16][17][18] contrast agents, however, long pulses also increase the effect of diffusion on the microbubble. The new simultaneous optical and acoustical system for observation of microbubbles was used here to evaluate the nonlinear components in the received echoes, the similarities and differences between echoes from increasing and decreasing frequency excitation, and the effect of diffusion on the quality of the predicted echoes.…”

Section: Nih Public Accessmentioning

confidence: 99%

Observation of contrast agent response to chirp insonation with a simultaneous optical-acoustical system

Sun¹,

Zhao²,

Dayton³

et al. 2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Rayleigh-Plesset analysis, ultra-high speed photography, and single bubble acoustical recordings have previously been applied independently to characterize the radial oscillation and resulting echoes from a microbubble in response to an ultrasonic pulse. In addition, high speed photography has shown that microbubbles are destroyed over a single pulse or pulse train by diffusion and fragmentation. In order to develop a single model to characterize microbubble echoes based on oscillatory and destructive characteristics, an optical-acoustical system was developed to simultaneously record the optical image and backscattered echo from each microbubble. Combined observation provides the opportunity to compare predictions for oscillation and echoes with experimental results and identify discrepancies due to diffusion or fragmentation. Optimization of agents and insonating pulse parameters may be facilitated with this system. The mean correlation of the predicted and experimental radius-time curves and echoes exceeds 0.7 for the parameters studied here. An important application of this new system is to record and analyze microbubble response to a long pulse where diffusion is shown to occur over the pulse duration. The microbubble response to an increasing or decreasing chirp is evaluated using this new tool. For chirp insonation beginning with the lower center frequency, low frequency modulation of the oscillation envelope was obvious. However, low frequency modulation was not observed in the radial oscillation produced by decreasing chirp insonation. Comparison of the echoes from similar sized microbubbles following increasing and decreasing chirp insonation demonstrated that the echoes were not time-reversed replicas. Using a transmission pressure of 620 kPa, the −6 dB echo length was 0.9 and 1.1 μs for increasing and decreasing chirp insonation, respectively (P = 0.02). The mean power in the low frequency portion of the echoes was 8 (mV) 2 and 13 (mV) 2 for increasing and decreasing chirp insonation, respectively, (P = 0.01).

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Parameter optimization of pulse compression in ultrasound imaging systems with coded excitation

Cited by 51 publications

References 8 publications

Quinary excitation method for pulse compression ultrasound measurements

Quinary excitation method for pulse compression ultrasound measurements

Through-container measurement of acoustic signatures for classification/discrimination of liquid explosives (LEs) and precursor threat liquids

Observation of contrast agent response to chirp insonation with a simultaneous optical-acoustical system

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