Int J Comput Assist Radiol Surg - Average sound speed estimation using speckle analysis of medical ultrasound data.

Tópicos

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Resumo

RPOSE: Most ultrasound imaging systems assume a pre-determined sound propagation speed for imaging. However, a mismatch between assumed and real sound speeds can lead to spatial shift and defocus of ultrasound image, which may limit the applicability of ultrasound imaging. The estimation of real sound speed is important for improving positioning accuracy and focus quality of ultrasound image.METHOD: A novel method using speckle analysis of ultrasound image is proposed for average sound speed estimation. Firstly, dynamic receive beam forming technology is employed to form ultrasound images. These ultrasound images are formed by same pre-beam formed radio frequency data but using different assumed sound speeds. Secondly, an improved speckle analysis method is proposed to evaluate focus quality of these ultrasound images. Thirdly, an iteration strategy is employed to locate the desired sound speed that corresponds to the best focus quality image.RESULTS: For quantitative evaluation, a group of ultrasound data with 20 different structure patterns is simulated. The comparison of estimated and simulated sound speeds shows speed estimation errors to be -0.7 ? 2.54 m/s and -1.30 ? 5.15 m/s for ultrasound data obtained by 128- and 64-active individual elements linear arrays, respectively. Furthermore, we validate our method via phantom experiments. The sound speed estimation error is -1.52 ? 8.81 m/s.CONCLUSION: Quantitative evaluation proves that proposed method can estimate average sound speed accurately using single transducer with single scan.

Resumo Limpo

rpose ultrasound imag system assum predetermin sound propag speed imag howev mismatch assum real sound speed can lead spatial shift defocus ultrasound imag may limit applic ultrasound imag estim real sound speed import improv posit accuraci focus qualiti ultrasound imagemethod novel method use speckl analysi ultrasound imag propos averag sound speed estim first dynam receiv beam form technolog employ form ultrasound imag ultrasound imag form prebeam form radio frequenc data use differ assum sound speed second improv speckl analysi method propos evalu focus qualiti ultrasound imag third iter strategi employ locat desir sound speed correspond best focus qualiti imageresult quantit evalu group ultrasound data differ structur pattern simul comparison estim simul sound speed show speed estim error ms ms ultrasound data obtain activ individu element linear array respect furthermor valid method via phantom experi sound speed estim error msconclus quantit evalu prove propos method can estim averag sound speed accur use singl transduc singl scan

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