fieldII教程

Users’guidefortheFieldIIprogramRelease3.24,May12,2014JørgenArendtJensenMay21,2014JørgenArendtJensenMay21,2014DepartmentofElectricalEngineering,Build.349,TechnicalUniversityofDenmarkDK-2800Lyngby,DenmarkE-mail:[e-mail]:http://field-ii.dk/CONTENTS1Introduction32Programorganization53Methodofsimulation73.1Thespatialimpulseresponse.......................................73.2Simulation................................................73.3Focusingandapodization........................................83.4Attenuation................................................84Installation95DescriptionofMatlabprocedures115.1Listofcurrentprocedures........................................115.2ProceduresforFieldinitialization....................................135.3Proceduresfortransducerdefinition...................................175.4Proceduresforelementmanipulation..................................455.5Proceduresforfieldcalculation.....................................506Examples596.1Phasedarrayimaging..........................................596.2Lineararrayimaging...........................................616.3Flowdatageneration...........................................64Bibliography66iiiLISTOFFIGURES5.1Concave,roundtransducerwitharadiusof8mmdividedinto1by1mmmathematicalelements...195.2RectanglesforaconvexarraywithRconvexequalto20mm.......................215.3Rectanglesforanelevationfocused,convexarraywithRfocusequalto10mmandRconvexequalto30mm...................................................225.4Rectanglesforanelevationfocused,multi-row,convexarraywithRfocusequalto7mmandRconvexequalto30mm...............................................245.5Rectanglesforanelevationfocused,lineararraywithRfocusequalto15mm..............265.6Rectanglesforanelevationfocused,multi-rowlineararraywithRfocusequalto10mmand5rows..275.7Displayofthegeometryandapodizationofalineararraytransducer...................305.8Rectanglesfora16elementslineararraytransducer...........................325.9Geomteryofmulti-rowlineararraytransducer.Currentlyxandyhasbeenswitched..........335.10Rectanglesfora16by5elementsmulti-rowtransducer..........................345.11Pistontransducerwitharadiusof8mmdividedinto1by1mmmathematicalelements........365.12Fullypopulatedtwo-dimensionalarraywith11by13elements......................435.13Partiallypopulatedtwo-dimensionalarraywith23elements.......................445.14Lineararraytransducerwithafixedapodizationofthemathematicalelements.............465.15Intensityprofileforlineararraytransducerwithanelevationfocuslens.................475.16Exampleofcalculatedresponsewhenusingdifferentphysicalelementexcitations...........495.17Receivedvoltagetracesfromtheindividualelementsofa16elementslineararraytransducer,whentransmittingwiththreedifferentelements.................................555.18Receivedvoltagetracesfromtheindividualelementsofalineararraytransducer(top)andthesumofalltheindividualresponses(bottom)....................................5712CHAPTERONEIntroductionThisistheuserguidefortheversion3.24ofMay12,2014oftheFieldIIprogram.ThisversionoftheprogramrunsunderMatlab8.201andcansimulateallkindsultrasoundtransducersandtheassociatedimages.Thefocusingandapodizationofthetransducerscanbecontrolleddynamically,anditis,thus,possibletosimulateallkindsofultrasoundimagingsystems.Theversionscanalsobeusedforsyntheticapertureimaging.Theprogramisfreeforuse,ifyoumakeaproperreferencetothepapersdescribingtheprogram,whenyoupublishresultsfromitsuse.Thereferenceare[1]and[2].Alsothenameoftheprogram(FieldII)shouldbementionedinthepublication.Someunfortunatelyforgetthis,andtheprogramwillonlystayinthepublicdomain,ifpeoplecontinuetoproperlyacknowledgeitsuse.Thisguideisintendedasapresentationofthecurrentlyavailableroutines.Itincludesafewexamplesandgivesasmallamountofbackgroundinformation.Itis,however,notintendedasanintroductiontoultrasoundscanning,andthereadershouldconsulttheextensiveliteratureonthis.TheprogramexecutablescanbedownloadedfromtheWeb-sitefortheprogram:http://field-ii.dk/ItcurrentlyexistforanumberofplatformslikeWindows,Linux,MacOS-X.Versionsforotheroperatingsystemsaregenerallydiscontinuedduetolackofdemand.AparallelProversionalsoexits.Informationaboutthiscanbefoundontheweb-siteabove.Thewebsitealsocontainsmoreextensiveexamplesthanaregiveninthisguide,andup-to-datereferencesandpaperscanalsobefoundontheweb-site.Themanualismadeasaclickablepdfdocumentwithhyperlinks.Alllinksareindicatedinblue,andwhenclickedonwillleadtotheindicatedreferences,whichcanbeaweb-site,figure,equation,etc.Themanualisorganizedasfollows:Chapter2givesanoverviewoftheorganizationoftheprogramandhowitisconnectedtoMatlab.Chapter4detailstheinstallationfromtheprogramsontheweb-site.AlistingofallprocedurescallableintheprogramisgiveninChapter5andfinallyafewexamplesaregivenin6.Morecanbefoundontheweb.JørgenArendtJensenMay21,2014DepartmentofElectricalEngineering,Build.349,TechnicalUniversityofDenmarkDK-2800Lyngby,DenmarkE-mail:[e-mail]1Olderversionscanbefoundontheweb-siteforMatlab4-734