putedTomographyCTBasics PrincipleofSpiralCT ScanParameter&ImageQuality OptimizingInjectionProtocols ClinicalApplicationsX-RayDiscoveryX-'ssuperimposedAndwecouldn',putedTomographyEarly1970s1963-AlanCormackdevelopedamathematicalmethodofreconstructingimagesfromx-rayprojectionsForthefirsttimewecouldview:CTBroketheBarrier-Tomographicor“Slice”anatomy-DensitydifferenceButit'stimeconsumingAndresolutionneedstobeimprovedConceptofX-rayAttenuationAnX-raybeampassingthroughthebodyisattenuated(losesitsenergy)by:AbsorptionScatteringIncidentX-rayTransmittedraySCATTEREDX-RAYSBODYTISSUEAbsorptionbythetissueisproportionaltothedensityLessdensetissueMoredensetissueMOREATTENUATIONLESSATTENUATIONHowdoesCTWork?Recon.&-raygenerationX-rateonlyanaxiallayeroftheobject,called"slice"HowdoesCTWork?PatientisplacedinthecenterofthemeasurementfieldX-rayispassedthroughthepatient’sslicefrommanydirectionalonga360°puterwhichcreatetheCTimageHowdoesCTWork??
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