catphan700manual

1ThePhantomLaboratoryCatphan®700ManualCopyright©2012WARRANTYTHEPHANTOMLABORATORYINCORPORATED(“Seller”)warrantsthatthisproductshallremainingoodworkingorderandfreeofallmaterialdefectsforaperiodofone(1)yearfollowingthedateofpurchase.If,priortotheexpirationoftheone(1)yearwarrantyperiod,theproductbecomesdefective,BuyershallreturntheproducttotheSellerat:ByTruckByMailThePhantomLaboratory,IncorporatedThePhantomLaboratory,Incorporated2727StateRoute29POBox511Greenwich,NY12834Salem,NY12865-0511Sellershall,atSeller’ssoleoption,repairorreplacethedefectiveproduct.TheWarrantydoesnotcoverdamagetotheproductresultingfromaccidentormisuse.IFTHEPRODUCTISNOTINGOODWORKINGORDERASWARRANTED,THESOLEANDEXCLUSIVEREMEDYSHALLBEREPAIRORREPLACEMENT,ATSELLER’SOPTION.INNOEVENTSHALLSELLERBELIABLEFORANYDAMAGESINEXCESSOFTHEPURCHASEPRICEOFTHEPRODUCT.THISLIMITATIONAPPLIESTODAMAGESOFANYKIND,INCLUDING,BUTNOTLIMITEDTO,DIRECTORINDIRECTDAMAGES,LOSTPROFITS,OROTHERSPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES,WHETHERFORBREACHOFCONTRACT,TORTOROTHERWISE,ORWHETHERARISINGOUTOFTHEUSEOFORINABILITYTOUSETHEPRODUCT.ALLOTHEREXPRESSORIMPLIEDWARRANTIES,INCLUDING,BUTNOTLIMITEDTO,THEIMPLIEDWARRANTYOFMERCHANTABILITYANDFITNESSFORPARTICULARPURPOSE,AREHEREBYDISCLAIMED.WARNINGThisproducthasanFH3-4mm/minflameratingandisconsideredtobeflammable.Itisadvisednottoexposethisproducttoopenflameorhightemperature(over125°Celsiusor250°Fahrenheit)heatingelements.CTP7003/1/1223ThePhantomLaboratoryCatphan®ManualContentsWarranty1Introduction5Multi-SliceCTbyDavidGoodenough,Ph.D.6Initialphantompositioning8IllustrationoftheCatphan®700modulepositions9Incrementalphantommodulespositioning10Phantompositionverification11CTP682Geometry,Sensitometrymodule12Scanslicegeometry(slicewidth)13Slicewidthmeasurementwithwireramps14Scanincrementation15Slicewidthmeasurementwithbeadramps16Measuringslicethicknesswithaprofilemadefrombeadimage18Additionalmethodsforestimatingandmeasuringslicethicknesswithbeadramps19Patientalignmentsystemcheck20Circularsymmetryofdisplaysystem22Spatiallinearityandpixelsizeverification22BeadpointsourceforpointspreadfunctionandMTF23UseofautomatedscannerMTFprograms24Beadpointsourceforslicesensitivityprofile25Sphericalacryliccontrasttargets26CTorHounsfieldNumbersbyDavidGoodenough,Ph.D.27Sensitometry(CTnumberlinearity)28Fillingthewatervial29CTP714Highresolutionmodulewith1-30linepair/cmgauges3030Linepairpercentimeterhighresolutiongauge30CTP515Lowcontrastmodulewithsupra-sliceandsubslicecontrasttargets31Waverampandbeadmodules30CTP712Imageuniformitymodule34Automatedcomputeranalysisprogram36Optionalphantomannuli37DosePhantoms38Samplequalityassuranceprogram39Bibliography404Catphan®7005IntroductionThePhantomLaboratoryandphysicist,DavidJ.Goodenough,Ph.D.,arecontinuallydevelopingandresearchingnewtestsandmodificationsfortheCatphan®phantoms.ThetestobjectsthatmakeupthecurrentCatphan®modelsembodymorethanaquartercenturyofscientificevaluationandfieldexperience.ThismanualoutlinestheapplicationsofeachmodulecontainedintheCatphan®700phantoms.Wedonotmakespecificrecommendationsonthecontentofyourqualityassuranceprogramaseachmedicalimagingfacilityhasitsownuniquesetofrequirements.Asampleprogramisprovidedtogiveyouideasforpossibleprogramcontent.Wesuggestareviewoflocalgoverningregulations,manufacturers’specifications,andtheneedsofyourradiologistsandphysicistsbeforedevelopingyourCTqualityassuranceprogram.IfyouhaveanyadditionalquestionspleasecontactThePhantomLaboratoryat:Phone:[phone]or518-692-1190Fax:[phone]email:[e-mail]rmationisavailableat:“cone-beam”algorithm.Thisseemstocorrectthenaturaldivergencefromasinglefocalspotpositiontothedetectorpositionaspositionedawayfromthecontroldetector(s).Bothmodalitiesusethedatafromthedetectors(positioned360°aroundthepatient)toreconstructtheaxialpatientimages.ThekeydifferencebetweenaxialsinglesliceCTandmulti-sliceistheaxialimageproducedbysinglesliceCTisdevelopedfromasinglerowofdetectors,andtheaxialimagemadefromamulti-slicescannerusessegmentsfromseveralrowsofdetectors.Withamulti-slicescan,asthepatientmovesthroughthegantryandthetuberotatesaroundthepatient,thedetectorrowsutilizedchangeasthepatientandgantrymove(seesketchonthenextpage).Additionalvariablesinreconstructionresultasthepatientslicemovesfromonerowofdetectorstothenextandthescannerreconstructstheimagesbasedonweightedaveragesbetweentherelevantrows.Inthisway,multi-sliceCTisanalogoustospiralorhelicalsinglesliceCT,butwherethereconstructionisobtainedfromthecombinedslicesratherthantheinterpolationbetweenthereadingsofasinglemovingslice.Nowaddinfocalspotvariablesandalittlescattertodefineinmoredetailthechallengesandvariablesinc