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ID:17963353
大小:9.20 MB
页数:20页
时间:2018-09-11
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1、Dual-energyCTrevisitedwithmultidetectorCT:reviewofprinciplesandclinicalapplicationsMuşturayKarçaaltıncaba,AykutAktaş©TurkishSocietyofRadiology2010Fig.1.a,b.AxialDECTimagesacquiredatthelevelofthepulmonaryarterydemonstratetherelationshipbetweenaHounsfieldunitmeasurementandkVp.Reg
2、ionofinterest(ROI)measurementsoftheaortaon140and80-kVpimagesyielded312Hand595H,respectively.Theiodinecontrastdensityintheimagewasalmostdoublethatofthe80-kVpimage.Fig.4.a–d.AxialimagesofbrainCTAandspectralcurveforiodine(aandb)andwater(candd)imageswereacquiredusinggemstonespectral
3、imaging.Notethehyperdenseareaonthewater(virtualunenhanced)image,whichisconsistentwithhemorrhage.Thespectraldatashowthedensityofthehemorrhage(yellow),superiorsagittalsinus(whiteandblue)andnormalareaontheiodine(b)andwaterimages(d)fordifferentkeV.Nodifferencesinthespectraldataforth
4、ehemorrhagicareaareevident.Fig.6.a,b.Axialiodinemap(a)andvirtualnon-contrast(b)imagesacquiredusingdualsourceCTshowanabsenceofenhancementandcalcificationwithinthesolitarylungnoduleontherightside.Fig.7.a–c.Arterial-phase4-chamber(a),delayedenhanced4-chamber(b)and2-chamber(c)80-kVp
5、DECTimageswereacquiredbydualsourceCT.NotethesuperiordistinctionoftheapicalthrombusfromtheviablemyocardiumonthedelayedDECTimages.Fig.8AxialDECTimagefromtheleftventricleacquiredbygemstonespectralimagingwithouttheadministrationofcontrastshowsahyperdenseappearanceoftheleftventriclem
6、yocardium.Spectralanalysisofthemyocardium(red,pinkandbluecircles),intercostalmuscles(yellow)andsubcutaneousfatshowsanincreaseddensityofthemyocardiuminthelowerkeVspectrumcomparedtothespectralpatternobservedforsubcutaneousfatandintercostalmuscles.Fig.9.a–c.Coronalvolume-rendered(a
7、),MIP(bandc)andDECTAngiographyimagesacquiredbydual-sourceCTshowdualenergyBoneremoval(b)andcalcificplaqueremoval(c).Fig.10.a–c.AxialDECTimage(a)acquiredusinggemstonespectralimagingwithoutcontrastadministrationshowsthequantificationofsteatosisbythedual-energymethods.Thespectralpat
8、ternofthesteatotic(pink)areaandhypersteatotic(g
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