一种合成聚焦的便携式B型超声成像方法.docx

一种合成聚焦的便携式B型超声成像方法
摘要
本文提出一种基于合成聚焦的便携式B型超声成像方法。该方法利用多元素阵列探头，在探头和物体间形成多个超声波束，并通过算法将这些波束聚焦在物体内部特定深度的区域。这种方法可以提高成像分辨率和信噪比，适用于便携式设备，实现了在不影响成像质量的情况下减小设备体积和重量。
关键词：合成聚焦、B型超声成像、多元素阵列探头、便携式设备、成像分辨率、信噪比
Introduction
B-modeultrasoundimagingisawidelyusedmedicaldiagnostictooldueitsabilitytoprovidereal-timeimagesofinternalorgansandtissueswithoutexposingpatientstoharmfulradiation.However,traditionalB-modeultrasoundimagingoftensuffersfromalackofimageresolutionandlowsignal-to-noiseratio(SNR),resultinginimageartifactsandreduceddiagnosticaccuracy.Inrecentyears,variousmethodshavebeenproposedtoimproveB-modeultrasoundimaging,suchassyntheticapertureimagingandspecklereductiontechniques.Amongthesetechniques,syntheticfocusing,alsoknownassyntheticaperturefocusingtechnique(SAFT),isapromisingmethodthatcansignificantlyimproveimagequality.
Inthisstudy,weproposeaportableB-modeultrasoundimagingmethodbasedonsyntheticfocusing.Thismethodutilizesamulti-elementarraytransducertogeneratemultipleultrasoundbeamsbetweenthetransducerandtheobject.Thesebeamsarethenusedtocreateafocusedimageataspecificdepthwithintheobjectbyprocessingallofthereflectedsignalsusinganalgorithmthatconsiderstheirrespectivetimedelaysandamplitudes.
Methodology
Theproposedmethodinvolvestheuseofamulti-elementarraytransducerthatcontainsalargenumberofsmallultrasoundtransducers.Thesetransducersarearrangedinagridpatternandconnectedtoindividualchannelsofanultrasoundimagingsystem.Togeneratemultiplebeams,eachofthetransducersisexcitedwithaspecifictimedelayandamplitude.Bycarefullycontrollingthetimedelaysandamplitudesofeachtransducer,multiplebeamscanbegeneratedatdifferentanglesanddepthwithintheobject.
Inordertocreateasyntheticfocus,thereflectedsignalsfrommultiplebeamsarecombinedandprocessedusinganalgorithmthatcalculatesthetimedelaysandamplitudesofeachsignal.Oncethesecalculationsareperformed,thereflectedsignalscanbeaddedtogethertocreateanimageoftheobjectwithimprovedresolutionandSNR.
Results
Toevaluatetheperformanceoftheproposedmethod,weconductedexpe