ultrasound elastography using emd analysis
نویسندگان
چکیده
ultrasoundelastographyisanon-invasivemethodwhichimagestheelasticityofsoft-tissues. tomakeanimage, preandafterasmallcompression, ultrasoundradio frequency(rf)signalsareacquiredandthetimedelaysbetweenthemareestimated. thefirstdifferentiationofdisplacementestimationsiscalledelastogram. inthisstudy, wearegoingtomakeanelastogramusingtheprocessingmethodnamed empirical mode decomposition (emd). emdisananalytictechniquewhichdecomposesacomplicatedsignaltoacollectionofsimplesignalscalledintrinsicmodefunctions(imfs). theideaofpaperisusingtheseimfsinsteadofprimaryrfsignals. toimplementthealgorithmstwodifferentdatasetsselected. thefirstonewasdatafromasandwichstructureofnormalandcookedtissue. the second datasetconsistedofaround 180 framesacquiredfromamalignantbreasttumor. fordisplacementestimating, twodifferentmethods, cross-correlationandwavelettransform, wereusedtooandforevaluatingthequality, twoconventionalparameters, signal-to-noiseratio(snr)andcontrast-to-noiseratio(cnr)calculatedforeachimage. resultsshowthatinbothmethodsafterusingemdthequalityimproves. infirstdatasetandcrosscorrelationtechniquecnrandsnrimproveabout 16dband 9dbrespectively. insamedatasetbyusingwavelettechnique, theparametersshow14dband10dbimprovementrespectively.in second dataset(breasttumordata)cnrandsnrincrosscorrelationmethodimprove 18dband 7dbandinwavelettechniqueimprove 17dband 6dbrespectively.
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عنوان ژورنال:
journal of medical signals and sensorsجلد ۴، شماره ۱، صفحات ۱۸-۰
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