Coded Excitation in TCD Ultrasound Systems to Improve Axial Resolution

Cowe, Joanne; Gittins, John; Evans, David H.

doi:10.1016/j.ultrasmedbio.2007.02.012

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…In addition, Richard Y. Chiao and Xiaohui Hao [2] quantified tradeoffs between penetration and resolution, compared chirp and Golay code performance and illustrated the applications of coded excitation in B-mode, harmonic and flow imaging (2005). Joanne Cowe et al [3,4] proposed a method of using chirp to improve axial resolution of TCD systems and track the motion of emboli. Xiang Lei et al [5] suggested that the system using Barker-coded excitation obtained a 2.78dB improvement in measured embolus-to-blood (2009).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study On Digital Design Of Doppler Ultrasound With Coded Excitation

Li¹,

Zhang²,

Li³

et al. 2016

Proceedings of the 2016 4th International Conference on Advanced Materials and Information Technology Processing (AMITP 2016)

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Section: Introductionmentioning

confidence: 99%

Experimental Study On Digital Design Of Doppler Ultrasound With Coded Excitation

Li¹,

Zhang²,

Li³

et al. 2016

Proceedings of the 2016 4th International Conference on Advanced Materials and Information Technology Processing (AMITP 2016)

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“…It has previously been demonstrated, in our laboratory, that using coded excitation and pulse compression is potentially beneficial in transcranial Doppler (TCD) ultrasound devices ( [1]- [3]). However, this is a very specific application of Doppler ultrasound and therefore further investigations were carried out to ascertain the wider validity of the techniques.…”

Section: Introductionmentioning

confidence: 99%

Coded excitation can provide simultaneous improvements in sensitivity and axial resolution in Doppler ultrasound systems

Cowe

Boni

Ricci

et al. 2010

2010 IEEE International Ultrasonics Symposium

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We investigated the possibility of using coded excitation and pulse compression in Doppler ultrasound systems to improve resolution and signal-to-noise ratio (SNR) without increasing transmitted energy or peak power. A small target simulator was used, together with a programmable real-time ultrasound system which has the facility to generate arbitrary transmit waveforms and to acquire the received RF signal.The study demonstrated that it was possible to achieve an axial resolution of 0.197 mm with sidelobe level of -42.3 dB when using a linearly frequency modulated chirp with 5 μs duration, 8 MHz bandwidth and 8 MHz centre frequency. This can be compared with the 0.217 mm resolution obtained when using a 3-cycle noncoded pulse with 8 MHz centre frequency. On average the SNR was improved by 8.1 dB when using the chirp compared with the non-coded pulse. This improvement was achieved despite the two pulses having approximately the same transmitted energy and the peak amplitude of the coded signal being 47% of the noncoded signal.We conclude that simultaneous improvements in axial resolution and SNR can be made in Doppler ultrasound systems using coded excitation and pulse compression, without increasing the transmitted energy and with a reduction in pulse amplitude, when compared with conventional, non-coded processing.

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