Questions and Answers Updated
2026
ComputedATomographyA(CT)A-AAnswerAMedicalAImagingAtechniqueAinAwhichAcomputer-
enhancedAcross-sectionalAX-rayAimagesAareAobtainedAforAaAdiagnoses.
JohannARadonA-
AAnswerAHeAdevelopedAtheAmathematicalAtheoryA"RadonATransform"AinA1917AthatAallowed
AimagesAtoAbeAreconstructedAfromAmedicalAscans.A
LayAtheAgroundworkAforAHounsfield/Cormack*
GodfreyAHounsfieldA-AAnswerA"FatherAofACT"A/ABritishAEngineer
HeAdevelopedAtheAFIRSTAAxialACTAscannerAforAEMIALaboratoriesAinA1972.
AllanAMacLeodACormackA-AAnswerASouthAAfricanAPhysicist
HeAdevelopedAtheAnecessaryAmathematicsAinAorderAforAtheAFIRSTAAxialACTAscannerAtoAfunctio
nAinA1972.
JamesAAmbroseA-AAnswerARadiologistAatAAtkinson-Morley'sAHospital
HeAworkedAwithAHounsfieldAinAorderAtoAevaluateAtheAusefulnessAofAtheAFIRSTACTAmachineAin
A1972.
OctoberA1,A1972A-
AAnswerADateAthatAtheAFIRSTACTAscanAwasAdoneAonAaALIVINGAhumanAbeing.AHelpedAtoAdia
gnoseAaAbrainAlesionAinAaAfemaleApatient.
ComputerizedAtransverseAaxialAscanningA-AAnswerATheAnameAofAtheAfirstACTAscanner,A1972.
Dr.ARobertALedleyA-AAnswerAProfessorAofARadiology,APhysiologyAandABiophysics
HeAdevelopedAtheAFIRSTAfull-bodyACTAmachineA1974.
CTA"generations"A-
AAnswerAReferredAtoAtheAmethodAofACTAscanning,AitAdescribesAtheAadvancementsAinATechnol
ogyAthroughAtheAyears.
, FirstAGenerationA-AModernACTAscanners
(3)ACTABeamAGeometriesA-
AAnswerA*TheAsize,Ashape,AandAmotionAofAtheAbeamAandAitsApathA
PencilA-AParallelAbeam
FanA-A10AdegreeAdivergentAbeam
ConeA-AWideAdivergentAfanAbeamA*ModernACT*
FirstAgenerationACTAscannerA-AAnswerAHeadAImagingAOnlyA/APencilABeamA/A1972
Translate-Rotate
Scan,AtableAmoves,Ascan..etcA
"WaterABag"AHeadAcapA-A1stAgenAonly
SLOW
SecondAgenerationACTAscannerA-AAnswerAHeadAImagingAOnlyA/AMiniAFanABeamA/A1974
Translate-Rotate
Scan,AtableAmoves,Ascan..etc
FasterAthanA1stAgen,ASLOW
ThirdAgenerationACTAscannerA-AAnswerATHISAGEOMETRYAWONA/A1975
AllAImagingA/AFanAbeamA
Rotate-RotateA
CurvedAarrayAofAdetectors
BeamAANDADetectorsArotatedA360AdegreesAaroundApt
FAST
FourthAgenerationACTAscannerA-AAnswerAAllAImagingA/AFanABeamA/A1976
Rotate-Stationary
X-
rayAbeamArotatedA360AdegreesAaroundAtheApatient,AbutAtheAdetectorsAwereAstationaryAinAaA
circle
FASTA,Aexpensive,AhighAscatter