Colonography, Computed TomographicColonic PolypsColonoscopyDiatrizoate MeglumineLaxativesEnemaCatharticsRadiographic Image Interpretation, Computer-AssistedColorectal NeoplasmsTomography, X-Ray ComputedInsufflationIothalamate MeglumineSensitivity and SpecificityBarium SulfateRadiographic Image EnhancementContrast MediaImaging, Three-DimensionalTomography Scanners, X-Ray ComputedMass ScreeningColonic DiseasesTomographyReproducibility of ResultsColonRadiologyImage Processing, Computer-AssistedFalse Positive ReactionsTomography, OpticalPattern Recognition, AutomatedProne PositionIohexolEarly Detection of CancerIncidental FindingsOccult BloodPolypsFeasibility StudiesDiagnosis, Computer-AssistedWisconsinAdenomatous PolypsPatient PreferenceCost-Benefit AnalysisAlgorithmsTomography, Emission-ComputedCone-Beam Computed TomographyInfarctionProspective StudiesSigmoidoscopyObserver VariationMagnetic Resonance Imaging