磁共振安全信息简介

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1、MRISafetyJerryAllison,Ph.D.CaveatThislectureemphasizesMRIsafetyforhighfield(1.5Tand3.0T)superconductingmagnetssuchasthoseusedatMCGHI.MRISafetyProjectileAccidentsForeignMaterialsintheBodyOtherStuffProjectileAccidentsTheMRImagnetsareALWAYSon(24hours/day,365days/year)ThereisaSTRONGfringemag

2、neticfieldaroundthemagnetsThefringemagneticfieldisconfinedtothescanroom4ProjectileAccidentsThefringemagneticfieldcancauseferrousmetalobjectstoflyintotheboreofthemagnetwithgreatforceandspeedFerrousmetalobjectscontainiron(steel)Thecloseryouaretotheboreofthemagnet,thestrongerthefringefield5

3、Asyouapproachthemagnet,thefringemagneticfieldgetsSTRONGER67http://simplyphysics.com/flying_objects.html#8http://simplyphysics.com/flying_objects.html#9http://simplyphysics.com/flying_objects.html#10http://simplyphysics.com/flying_objects.html#11MyFavoriteHorrorStoryHere'soneIheardfromanO

4、xfordMagnetsengineerwhichwaslaterindependentlyverifiedbyatechnologistwhohadbeenhiredtoworkatthissite.Abrandnewmagnethadjustfinishedbeinginstalledintoabrandnewbuilding.Alloftheacceptancetestinghadbeencompletedandthemagnetwastobeturnedovertothecustomertheverynextday.Therewasonlyoneminorpro

5、blemtobedealtwithfirst.Oneofthesprinklersinthescanroomhadatinyleak.Awelderwasbroughtintofixtheleak,butsomebodyforgottotellhimthatthemagnetwasatfield.So.....inwalksthiswelderwithhisacetylenetorchsystem.Histankfliesintothemagnet,thevalvebreaksoff,sparksandcatchesfire.Sincehewasintheretofix

6、aleakinthesprinklersystem,ithadbeenturnedofffirst.Thebrandnewbuildingburnedtotheground!http://simplyphysics.com/flying_objects.html#ProjectileAccidentsThefringemagneticfieldcanbedeadlyValhalla,N.Y.WestchesterCountyMedicalCenterJuly27,2001SixyearoldMichaelColombiniwasfatallyinjured“whenan

7、oxygencanisterwasturnedintoaguidedmissilebythepowerfulMRImagnet”12FatalAccidentDetailsMichaelColombiniwasintheboreofaGESignaAnanesthesiologistwasinthescanroomwiththepatientThebuilt-inoxygendeliverysystemfailedAnurseheardtheanesthesiologistcallingforoxygen13FatalAccidentDe