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1、医学课件中枢神经系统影像诊断CNS一、Examinationmethods1.X-rayplainfilmThismethodisverysimpleandcheap.Somelesionscanbefoundbyit.Usuallywecannotreachtoanexactdiagnosisonlybythisexamination2.TomographyExactdiagnosisstillcannotobtainedThemethodcanmanifestedsomeosseousdes
2、tructionwhichcannotbeshownbyplainfilm.Enhancement:3.CTTodisplaytumors,hemorrhage,infarction,infectionandabnormality.Toshowtheabnormalisodensitywhichcannotfoundbytheplainscan.Toconfirmthequalityofthelesion.Differentialdiagnosisoftumorandedema.Plainsca
3、n:Thecharactersofthelesionincludingsize,appearance,number,position,anatomyrelation,andsooncanbeshownbyit.5.Impressionofdiploicvein7.TheSella:6.Impressionofpacchioniangranulation8.Internalauditorymeatus:About6mmwide,symmetricalcanalThefrontalparietali
4、rregularhypodensitynearthemidline.Thediploicvein’simpressappearsasnetlikehypodensityintheparietalregion.7~16mmlong,7~14mmwideand8~20mmdeep.10.calcificationoffalxcerebri:9.Calcificationofpinealbody:11.Calcificationofchoroidplexus12Calcificationofpetro
5、-clinoidligament:Itispresentedasnodularhyperdensityonthelateralskullradiograph.Thefrontalviewshowthenormalpositionarepresentedthezonarydenseimageonthemidline.Calcificationofchoroidplexusarepresentedtheanomalisticdenseimageandlateraltomidline.Thedense
6、shadowbetweenintheanteriorandposteriorclinoidprocess.1.Whitematter:ishypodensetograymatter.CTvaluesis20-30Hu2.Graymatter:ishyperdensetowhitematter.CTvaluesis30-40Hu3.Ventricleandcistern:arehypodense.CTvaluesis0-10Hu4.Skull:ishyperdense.CTvalues>250Hu
7、5.Physiologicalcalcification:Spotorpatchdenseshadow.CTvalues>60Hu二、CTmanifestation三、MRImanifestation1.MorphologicalmanifestationAxial,coronal,sagittalMRIcanclearlyshowtheshapeofbrainandspinalcord,suchaswhitematter,greymatter,ventricle,cerebralfissure
8、,brainstem,cerebralvessel,pituitarybody,etal.Theefficiencyisclosetogrossspecimen.T1WIT2WIWHITEMATTERHIGHLOWGREYMATTERLOWHIGHCSFLOWHIGHFATHIGHMEDIUMSKULLTABLELOWLOWDIPLOEHIGHLOWMENINGESLOWLOWVESSELLOWLOWCALCIFICATIONLOWLOWMRIsignalintensityFrontallobe
