A NOVEL NONCONTACT ULTRASOUND INDENTATION SYSTEM

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1、UltrasoundinMed.&Biol.,Vol.31,No.6,pp.817826,2005Copyright©2005WorldFederationforUltrasoundinMedicine&BiologyPrintedintheUSA.Allrightsreserved0301-5629/05/$seefrontmatterdoi:10.1016/j.ultrasmedbio.2004.12.023●OriginalContributionANOVELNONCONTACTULTRASOUNDIN

2、DENTATIONSYSTEMFORMEASUREMENTOFTISSUEMATERIALPROPERTIESUSINGWATERJETCOMPRESSIONM.H.LU,Y.P.ZHENG,andQ.H.HUANGJockeyClubRehabilitationEngineeringCenter,TheHongKongPolytechnicUniversity,Kowloon,HongKong,PeoplesRepublicofChina(Received19July2004;revised17Decemb

3、er2004;infinalform30December2004)AbstractThisstudyisaimedtodevelopanovelnoncontactultrasonicindentationsystemformeasuringquantitativemechanicalpropertiesofsofttissues,whichareincreasinglyimportantfortissueassessmentandcharacterization.Thekeyideaofthismethodi

4、stouseawaterjetasanindentertocompressthesofttissuewhileatthesametimeasamediumforanultrasoundbeamtopropagatethrough.Theuseofwaterjetindentationdoesnotrequirearigidcompressorinfrontofthefocusedhighfrequencyultrasoundtransducertocompressthetissue,sothattheaddi

5、tionalattenuationcausedbytherigidcompressorandthestrongechoesreflectedfromitssurfacescanbeavoided.Theindentationdeformationwasestimatedfromtheultrasoundechoesusingacross-correlationalgorithmandtheindentationforcewascalculatedfromthewaterpressuremeasuredinsid

6、ethewaterpipe.Experimentswereperformedonuniformtissue-mimickingphantomswithdifferentstiffness.TheYoungsmoduliandPoissonsratiosofthesephantomsweremeasuredusingauniaxialultrasoundcompressionsystem.Theratiooftheindentationpressuretothetissuerelativedeformation

7、wasobtainedfromthewaterindentation.ThisratiowaswellcorrelatedwiththeYoungsmodulus(r
0.87).Theresultsalsodemonstratedthatthewaterindentationapproachcoulddifferentiatematerialswithdifferentstiffnessinacombinedphantom(288kPaand433kPa).Thisnovelnoncontactwateri

8、ndentationapproachcouldbepotentiallyusedforthemeasurementoftheelasticityofsmallsamplesandwithafastscanningspeed.(E-mail:ypzheng@ieee.org)©2005WorldFederationforUltrasoundinMedicine&Biology.KeyWords:Ult