CT Test review questions and answers updated 2026

CT Test review questions and
answers updated 2026
WhichAisANOTAaAsynonymAforAtheApreliminary/localizerAimageAtakenAatAtheAstartAofAaACTAex
amination?
A.ATopogram
B.AScout
C.AScanogram
D.ASpiralA-AAnswerAD.ASpiral


TheAabilityAofAaAsystemAtoAdifferentiate,AonAtheAimage,AobjectsAwithAsimilarAdensitiesAisAkno
wnAas:
A.AHighAcontrastAresolution
B.ALowAcontrastAresolution
C.ASpatialAresolution
D.ATemporalAresolutionA-AAnswerAB.ALowAcontrastAresolution


EachAtwoAdimensionalAsquareAofAdataAthatAmakeAupAtheACTAimageAisAcalledAa:
A.APixel
B.AVoxel
C.AMatrix
D.AFragmentA-AAnswerAA.APixel


HowAmanyApixelsAareAcontainedAinAaA1,024AmatrixAimage?AA.A1,024
B.A2,048
C.A262,144
D.A1,048,576A-AAnswerAD.A1,048,576


BeamAattenuationAcanAbeAdefinedAas:
A.ATheAphenomenonAbyAwhichAartifactsAresultAwhenAlowerAenergyAphotonsAareApreferentially
Aabsorbed,AleavingAonlyAhigher-intensityAphotonsAtoAstrikeAtheAdetectorAarray.

B.AXrayAenergyAthatAisAproducedAfromAbombardingAaAsubstanceAwithAfastAmovingAelectrons.

,C.ATheAabilityAofAtheAdetectorAtoAcaptureAtransmittedAphotonsAandAchangeAthemAtoAelectronic
Asignals.
D.ATheAphenomenonAbyAwhichAanAxrayAbeamApassingAthroughAaAstructureAisAdecreasedAinAin
tensityAorAamountAbecauseAofAabsorptionAandAinteractionAwithAmatter.A-
AAnswerAD.ATheAphenomenonAbyAwhichAanAxrayAbeamApassingAthroughAaAstructureAisAdecr
easedAinAintensityAorAamountAbecauseAofAabsorptionAandAinteractionAwithAmatter.


WhichAofAtheAfollowingAisAaAlowAattenuationAstructure:
A.AIodineAfilledAaorta
B.ARib
C.ATrachea
D.ACalcifiedAarteriesA-AAnswerAC.ATrachea


AnAobjectAisAslightlyAlessAdenseAthanAwater.AWhatAisAtheAexpectedAhounsfieldAmeasurement?
A.A-940
B.A-10
C.A50
D.A850A-AAnswerAB.A-10


WhyAdoesAtheAadministrationAofAiodinatedAcontrastAmediaAresultAinAanAenhancedAimage?
A.AIodinatedAcontrastAmaterialAincreasesAtheAabilityAofAtheAenhancedAstructureAtoAattenuateAt
heAxrayAbeam.
B.AIodinatedAcontrastAmaterialAdecreasesAtheAaverageAphotonAenergyAofAtheAxrayAbeam;Ather
eforeAmoreAphotonsAareAabsorbedAbyAtheApatient.
C.ATheAadministrationAofAcontrastAmaterialAresultsAinAaAsmallerApixel,AtherebyAincreasingAsp
atialAresolution,AwhichAresultsAinAanAenhancedAimage.
D.A-
AAnswerAA.AIodinatedAcontrastAmaterialAincreasesAtheAabilityAofAtheAenhancedAstructureAtoA
attenuateAtheAxrayAbeam.


TheAxrayAbeamAsourcesAforACTAproduceAxrayAenergyAthatAisApolychromatic.AThisAmeans:
A.AWhenAviewedAbyAtheAnakedAeye,AtheAbeamAexhibitsAmanyAdifferentAcolors.
B.AItAproduce,AasAaAbyproduct,AaAsubstanceAknownAasApolychlorinatedAbiphenyl.
C.APhotonsAcontainedAinAtheAbeamAareAallAofAtheAsameAwavelength.

,D.ATheAbeamAcomprisesAphotonsAwithAvaryingAenergies.A-
AAnswerAD.ATheAbeamAcomprisesAphotonsAwithAvaryingAenergies.



AnAobjectAthatAappearsAonAtheAimageAbutAisAnotApresentAinAtheAobjectAscannedAisAcalledAa/
n:
A.AArtifact
B.AAnomaly
C.AShadow
D.AGhostA-AAnswerAA.AArtifact


WhichAisAanAadvantageAofAfilteringAtheAxrayAbeam?
A.AFilteringAreducesAtheAanodeAheatAload
B.AAAfilteredAbeamAproducesAimagesAwithAsubstantiallyAlessAquantumAmottle
C.AFilteringAtheAbeamApreventsAenergyAfromAbeingAconvertedAtoAheat,AthereforeA100%AofAthe
AenergyAisAconvertedAtoAxrays.
D.AFilteringAreducesAtheAradiationAdoseAtoAtheApatient.A-
AAnswerAD.AFilteringAreducesAtheAradiationAdoseAtoAtheApatient



ScanAthicknessAisAprimarilyAimportantAforAtheApartAitAplaysAin:
A.ANoiseAreduction
B.ATheAcontrastAscale
C.ADetectorAapertureAopening
D.AVolumeAaveragingA-AAnswerAD.AVolumeAaveraging


YouAareAworkingAwithAtheAradiologistAtoAestablishAexaminationAprotocolsAforAyourAdepartme
nt.AWhichAofAtheAfollowingAisAaAlogicalAconsiderationAwhenAdeterminingAanAappropriateAslice
AthicknessAforAstudiesAofAtheAinternalAauditoryAcanal?
A.ABecauseAtheAauditoryAossiclesAareAquiteAsmall,AaAthinAsliceAwillAbeAnecessaryAtoAreduceAt
heAchanceAthatAvolumeAaveragingAwillAobscureAtheirAappearanceAonAtheAimage.
B.ATheAappropriateAsliceAthicknessAwillAvaryAconsiderablyAfromApatientAtoApatient.ATherefore,
AeachAtechnologistAshouldAbeAfreeAtoAadjustAtheAsliceAthicknessAasAheAorAsheAdeemsAnecessa
ryAforAtheAparticularApatient.
C.AAAsliceAthicknessAofA5AtoA7mmAisAadequateAbecauseAtheAstructuresAofAinterestAareAnotApa
rticularlyAsmallAandAtheAexaminationAisAmostAoftenAorderedAasAaAscreeningAstudyAforAasymp
tomaticApatients.

, D.ATheAthickestAsliceAavailableAshouldAbeAusedAtoAreduceAtheAradiationAdoseAtoAtheAcorneas.
A-
AAnswerAA.ABecauseAtheAauditoryAossiclesAareAquiteAsmall,AaAthinAsliceAwillAbeAnecessaryA
toAreduceAtheAchanceAthatAvolumeAaveragingAwillAobscureAtheirAappearanceAonAtheAimage.


HowAmanyACTAnumbersAareAassignedAtoAeachApixelAinAtheAimageAmatrix?
A.AOneAhalfAtheAnumberAofAallAvaluesArecordedAfromAtheAdetectorAarray
B.AOne
C.ATheAnumberAofAHUAperApixelAisAoneAtenthAtheAdisplayAfieldAofAview
D.ATwoAvaluesAforAaA256Amatrix;A4AvaluesAforAaA512AmatrixA-AAnswerAB.AOne


WhichAisAanotherAnameAforArawAdata?
A.AImageAdata
B.AScanAdata
C.AReconstructedAdata
D.ADisplayedAdataA-AAnswerAB.AScanAdata


WhenAinAtheAanatomicAposition,AtheAarmsAare:
A.AraisedAaboveAtheAhead,ApalmsAbackwards
B.AcrossedAoverAtheAchest,ApalmsAonAoppositeAshoulders
C.AdownAbyAtheAsides,ApalmsAforward
D.AbyAtheAsides,AelbowsAbent,ApalmsAbackwardAandArestingAonAhipsA-
AAnswerAC.AdownAbyAtheAsides,ApalmsAforward



WhichAofAtheAfollowingAcomponentsAisANOTAhousedAwithinAtheAgantry?
A.AThreeAphaseAgenerator
B.AHigh-frequencyAgenerator
C.ASlipArings
D.AXenonAgasAdetectorsA-AAnswerAA.AThreeAphaseAgenerator


TheApowerAcapacityAofAtheAgeneratorAisAlistedAin:
A.AmilliamperesA(mA)
B.AthousandAheatAunitsA(KHU)