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1、医学影像学简答题1（Medicalimagingsimplifiedanswer1）3.Shortanswergeneral1.BriefdescriptionofmedicalX-raycharacteristicsTheXrayisanelectromagneticwavewithpenetration;Fluorescenceeffect;Photographiceffectsandbiologicaleffects.Itspenetrationisrelatedtomaterialdensity,thicknessandwavelengthofXray,andfluoresce
2、nceeffectisthebasisoffluoroscopy.PhotographiceffectisthebasisofX-rayphotography;Theionizationeffect,whichinvolveschangesinhumanbiology,isthebasisofradiologicalprotectionandradiotherapy.2.ThebasicprincipleofX-rayimagingisdescribedOntheonehand,itisbasedonthepenetrationoftheXray,thefluorescenceeffe
3、ctandthephotographiceffect,andontheotherhand,thedifferencebetweenthedensityandthicknessofthebodytissue.WhentheXrayspenetratevarioustissuesofthehumanbody,itisabsorbedindifferentdegreessothatthereisadifferenceintheamountofXonthescreenorintheX-ray.Thisallowsforcontrastbetweentheblackandwhitecontras
4、tonthescreenorintheX-ray.Bones,jointsystems1.TheX-rayperformanceofacuteandchronicsuppurativeosteomyelitisThesuppurativeosteomyelitisiscausedbystaphylococcusaureusinthebonemarrow,goodhairinchildrenandjuvenile,longbackboneepiphysisgoodhair.Theearly(2weeks)mayhavethefollowingsofttissuechanges:1.Two
5、,subcutaneoustissueandmuscleintersectionsblurred,bonemaynothaveobviouschange.Bonechangeswereseenafter2weeks.Thelocalizedosteoporosiswasstartedintheepiphysealcancellousbone.Subsequently,mostdispersedirregularformofbonedestruction.Edgeblur.Inthefuture,thebonedestructionareamaymergeintoalargeareaof
6、destruction.Andgraduallyextendtothebackbone.Canbeaccompaniedbypathologicalfracture.Osteocorticaldestructioncanformthesubperiosteumabscessandstimulatetheperiosteumtocauseperiostealhyperplasia.Thenewbonewithlowdensityisparalleltothebackbone.Later,asthecourseofillnessextended.Thenewosteogenesisisob
7、viousandcanformtheshell.Osteonecrosisiscausedbytheemergenceofperiosteumandthromboticarteritis.TheX-rayshowsthedeadboneformedalongtheaxisofthebone,whichisverydense.Ifthelesionisclosetothejoint,theabscesscandestroythebonecorte
