Questions and Answers
WhatAisACTAandAwhatAisAitAusedAfor?A-AAnswerACTAusesAdiagnosticAx-raysAtoAcreateAcross-
sectionalAimagesAofAtheAhumanAbody.AItAusesAmathematicalAalgorithmsAtoAcombineAtheseAim
agesAtogether.AIt'sAhelpfulAinAobtainingAofAvolumeAofAinformationAsoAweAcanAseeAstructuresA
inA3Adimensions.AIt'sAextremelyAhelpfulAwithAcancersAtoAbeAableAtoAdetectAtheAsizeAandAsha
peAofAaAmass.
WhatAareAtheAcomponentsAofAtheAequipment?A-
AAnswerAGantry:AGantryAincludesAtheAcouchA(table)AandAsupport,AscannerAhousing,AxArayAtu
be,AandAdetectors.A
Computer:AdisplaysAimages
OperatingAconsole:ACTAcanAhaveAupAtoAthreeAoperatingAconsoles.
HowAdoesAtheAequipmentAwork?A-AAnswerATheAx-
rayAtubeAisApulsedAandAhasAaAfanAshaped/AnarrowAbeam.AItAhasAaArotatingAtubeAthatAisAo
ppositeAofAtheAdetector.ATheAtubeAhasAaAsmallAfocalAspot.ATheAdetectorAsendsAdataAtoAtheAco
mputerAandAmeasuresAtheAattenuationAcoefficient.ATheAcomputerAreceives,Aprocess,AdisplaysAa
ndAstoresAdata.AItAalsoAdisplaysAtheAtechnique,AandAallowsAforApostAprocessing.
WhatAareAhousefieldAunits?A-
AAnswerAtissueAdensityAvaluesAandAmeasureAtheAthicknessAofAtissueAthatAcanAbeAusedAforA
contrast,AandAdetectionAofAdiseases.
WhatAareAtheAlimitationsAofACT?A-AAnswerA-
WhileAtheAmachineAisAhelical,A360AdataAisAnotArequired
-AMotionAcanAcauseAstreakingAofAtheAimage
-AMetalAobjectsAattenuateA100%AofAtheAbeam
-ABeamAhardeningAcausesAbroadAdarkAbands/streaks
-APartialAvolumeAeffectA(smallerAstructuresAgetAhidden)
-AringAartifacts
-AhigherAdose
-AhighAcost
WhatAareAtheAadvantagesAofACT?A-AAnswerA-acquireAmoreAimagesAfast