ct设备与原理试题

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1、1.CTisanewtechniqueinx-rayimagingthatdoesnot:(a)useacomputertoreconstructcross-sectionalimagesofanobject;(b)usemathematicalmethodstoreconstructcross-sectionalimagesofanobject;(c)usespecialdetectorstodetectx-raysthathavepassedthroughanobjectatmultipleangles;(d)Usex-r

2、ayfilmastheimagereceptorCTisanewtypeofcross-sectionaltomographicimaginginwhichallunwantedplanesorlayersofabodyarecompletelyeliminatedusingmathematicaltechniques;ThegoalofCTistodetectradiationthathaspassedthroughabodyatmultipleangles,andwiththeaidofacomputer,torecons

3、tructacrosssectionofabsorptionvaluesforthatbodysection;2.whodevelopedthefirstwholebodyCTscanner?(a)Hounsfield;(b)Ambrose;(c)Ledley;(d)generalelectriccompany3.whichgenerationofCTscannersisbasedonthetranslate/rotateprincipleusingasinglex-raybeam?(a)First-generation;(b

4、)second-generation(c)Third-generation;(d)fourth-generation4.Themaindifferenceofthefourth-generationscannercomparedtotheearlierscannersis:(a)thetubeanddetectorsrotatetogetheraroundthepatient;(b)Theuseofslipring;(c)thetuberotateswithastationeryringofdetectors;(d)there

5、isdecreaseinnumberofdetectors;5.Thefirstreconstructionfromprojectionswasusedby:(a)Radon;(b)Hounsfield;(c)Roentgen;(d)Rowley6.whyisathird-generationsystemsometimesreferredtoasarotate-rotatescanner?(a)thetubefirstrotatesinonedirection,thenstopstorotateintheoppositedir

6、ection;(b)thetubecontinuestorotateinthesamedirction;(c)Thetubeanddetectorrotateinunison,facingippositeoneanother;(d)thetubeanddetectoreachrotateintheoppositedirection;7.CTissuperiortoconventionalfilm/screenradiographyinits:(a)abilitytoprovideradiographicimageswitham

7、uchlowerradiationdose;(b)capacityforsurveyingmanydiverseanatomicareasquickly;(c)Abilitytoresolvesmalldifferencesintissuedensities;(d)Spatialresolution;ThegoalofCTistoovercomethelimitationsofradiographyandtomographybyachievingthefollowing:1.minimizingtheproblemofsupe

8、rimpositionImprovingthecontrastoftheimage;Findingawaytorecordverysmalldifferencesintissuecontrast.六1.thepurposeofarotatinganodeisto:(d)a)d