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河南省放射學會
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超聲影像
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博文
(2005-04-20 16:47:48)
(2005-04-20 16:43:48)
ThePelvis:AnatomyandPhysiologyofthePelvis
CTisexcellentforimagingthesofttissuesandboneinthepelvis(Figure23&24).Patientpreparationisimportantandoralcontrastisusuallygiven1to2hoursbeforescanningtohelpenhanceanddefineorganboundaries.Intravenouscontrastisalsoroutinelygivenandinsomecasesrectalcontrastisadministered.
ImagingofthePelvis(Figure23)
Theimageontheleftshowsad...[閱讀全文]
(2005-04-20 16:42:15)
TheAbdomen:TheAdrenalGlands
Theadrenalglands(Figure22)arepairedorganslyingonthesuperiorpoleofthekidneys.Theyareoftenreferredtoassuprarenalglands.OnCTtheylooklikelittletrianglesonanaxialimage.Theadrenalglandsarecomposedofanoutercortexandinnermedullathatfunctionasseparateglands.Themedullasecretesepinephrineandnorepinephrinewhicharestimulants.Thesestimulantsactonmanyareasofthebodyincludingpupildi...[閱讀全文]
(2005-04-20 16:39:34)
Thekidneys(Figure21)filterwasteproductsfromtheblood.Theyalsofilternutrientswhicharereabsorbedintothebloodstream.Theimportantpartsarethehilum,(containingtherenalartery,vein,andpelvis)theoutercortexandtheinnermedulla.UnenhancedCThasprovenusefulinthedetectionofobstructingureteralstones.Theuretersdescendretroperitoneallyfromthekidneysattherenalpelvisandentertheurinarybladderposteriorly.Unenhanced...[閱讀全文]
(2005-04-20 16:37:32)
TheAbdomen:ThePancreas
Thepancreasliesretroperitoneallyanddiffersinsize,location,andshapefrompersontoperson.Theheadliesinthecurveoftheduodenum,thebodybehindthestomach,andthetailtouchesthespleen(Figure19).Itsfunctionissecretionofthemajorenzymesfordigestionincludingtrypsin,amylaseandlipase.Trypsinactsonproteosesandpeptoneswhichareprocessedproductsofprotein.Amylasehelpsprocessstarchesandlipaseact...[閱讀全文]
(2005-04-20 16:35:39)
TheAbdomen:TheSpleen
Thespleenislargelymadeupoflymphoidtissueandislocatedintheupperleftquadrantoftheabdomen.Thespleenfiltersbloodandmanufactureslymphocytesandmonocytesusedinfightinginfection(Figure18).Lymphocytespossesslimitedphagocytic(ingestionanddigestionofbacteriabyphagocytes)properties.Phagocyteliterallymeanstoeatcells.Thiscellhasthecapabilitytoingestanddestroybacteria,cells,colloidsandmo...[閱讀全文]
(2005-04-20 16:34:18)
TheAbdomen:TheLiver
Theliveristhelargestglandinthebodyanditislocatedintherightupperquadrantoftheabdomen.Ithasalargerightlobe,asmallerleftlobe,andasmallquadratelobe.Thefunctionoftheliveristheformationofbile,maintaininganormalglucoseconcentration,fatandproteinmetabolism,andtheremovalofdrugs,hormones,andtoxins.Thegallbladder'smainfunctionisstorageandconcentrationofbile.Bileleavingthegallbladderis...[閱讀全文]
(2005-04-20 16:32:49)
TheAbdomen:ScanTechnique
CTissuperiorfordetectingabnormalnodesintheupperretroperitoneumandinferiormediastinum.Itprovidesvisualizationofenlargednodesinthemesentaryandhilarareas.Evaluationofextranodaltissueintheliver,kidney,bone,andlungsduringasingleexaminationispossibleusingcurrentCTtechnology.(Figures13-16)
ImagingoftheAbdomen(Figure13)
ContrastenhancedCToftheabdomen....[閱讀全文]
(2005-04-20 16:31:38)
PostProcessingMethods:AdvancedTechniques
WhentheoverlappingaxialimagesfromahelicalCTacquisitionareloadedontoaworkstation,sophisticateddisplayscanbeproduced.Themostcommonlyutilizeddisplaysaremultiplanarreformatting,maximumintensityprojections,surfaceandvolumerenderingandvirtualendoscopicviewing.Theseimagedisplayscanbeusedinabroadrangeofapplicationstoaidintheinterpretationofthestudyandtobetterun...[閱讀全文]
(2005-04-20 16:27:33)
CTAngiography:Abdomen
Aorticaneurysm(Figure9),dissection(Figure10)andtraumaticrupturearelife-threateningconditionsaffectingthethoracicaorta.Accuratedepictionoftheseprocessesandtheirrelationshiptothegreatvesselsandcoronaryostiaarenecessaryforguidingtreatment.CTAcanbeusedequallyeffectivelyintheevaluationofdissectionandassessmentofvasculargraftsandstents.(Figure11)
CTA-Aorti...[閱讀全文]
