國家衛生研究院 NHRI:Item 3990099045/1525
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    題名: Adaptive imaging using an optimal receive aperture size
    作者: Li, ML;Huang, SW;Ustuner, K;Li, PC
    貢獻者: Division of Medical Engineering Research
    摘要: Sidelobe contribution from off-axis targets degrades image quality in a coherent array imaging system. In ultrasound imaging, focusing errors resulting front sound-velocity inhomogencities in human tissue - also known as phase aberrations - reduce the coherence of the received signals and elevate the sidelobe level. This paper proposes an adaptive receive-aperture technique based on thresholding of the coherence factor (CF). The CF describes the coherence of the received array signals and can be used as an index of focusing quality. This paper demonstrates that thresholding of the CF allows the mainlobe-dominated signals to be distinguished from the sidelobe-dominated signals, after which the receive-aperture size at each imaging position can be optimally determined so as to enhance the main lobe-dominated signals and suppress the sidelobe-dominated signals. Thus, image quality degradation resulting from sound-velocity inhomogeneities can be reduced. Simulations and measured ultrasound data are used to evaluate the efficacy of the proposed technique. The characteristics of the proposed technique including the effects of the signal-to-noise ratio (SNR) and the transmit focal depth, and speckle reduction are discussed. The proposed technique is also compared with the parallel adaptive receive compensation algorithm and shown to produce a better improvement in image quality.
    關鍵詞: Acoustics;Engineering, Biomedical;Radiology, Nuclear Medicine & Medical Imaging
    日期: 2005-04
    關聯: Ultrasonic Imaging. 2005 Apr;27(2):111-127.
    Link to: http://www.ncbi.nlm.nih.gov/pubmed/16231840
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0161-7346&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000232347100005
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=26044476154
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