智慧人生
人生随缘 看不惯别人是自寻烦恼 .可以不拥有任何东西，除了对生活的激情。好好生活,你的生命是一次性的。
博文
(2004-12-28 06:37:27)
http://theonlinelearningcenter.com/songlarr8pinsonglarr1larrysong@126.comSonglarrsonglarr2http://www.chineseinfo.ca/links/songlarrlarrysong@126.com[阅读全文]
(2004-12-28 06:33:53)
http://theonlinelearningcenter.com/songlarr8pinsonglarr1larrysong@126.comSonglarrsonglarr2http://www.chineseinfo.ca/links/songlarr[阅读全文]
(2004-12-28 06:17:59)
[ReviewTest][certificate]CardiacDoppler:TheBasics10/28/2004[ReviewModule]
[ReviewTest][certificate]DopplerinUltrasoundApplications12/26/2004[ReviewModule]
[ReviewTest][certificate]DopplerUltrasoundSignalAnalysisandOptimization12/28/2004[ReviewModule]
[ReviewTest][certif...[阅读全文]
(2004-12-28 06:16:32)
1.Whichoneofthefollowingstatementsisfalse?
b.)Short,widerpulsesimproveresolution,orimagequality.
c.)Ultrasoundhasafrequencygreaterthan20kHz.
d.)Intensitydecreasesassoundtravelsthroughthebody.
Yousaid:
b).Short,widerpulsesimproveresolution,orimagequality.
Correct!ChoicesAthroughCarediscussedfromthebeginningofthetutoria...[阅读全文]
(2004-12-28 06:15:32)
1.ObstructiveDopplerflowcreatesa(n)_________invelocitywithassociated_________.
b.)increase,turbulence
c.)increase,laminarflow
d.)decrease,gradientflow
Yousaid:
b).increase,turbulence
Correct!RefertoIncreasedVelocityandNonlaminarFlowforfurtherstudy.See:IncreasedVelocityandNonlaminarFlow2.The________isthetheoreticalmaximumfrequencythatca...[阅读全文]
(2004-12-28 06:14:10)
1.Toeliminatealiasingthebestactionwouldbe:a.)SelectahigherDopplerfrequency.
b.)Placethesamplevolumeatagreaterdepth.
c.)Decreasethepulserepetitionfrequencyrange.
d.)SelectalowerDopplerfrequency.
Yousaid:
d).SelectalowerDopplerfrequency.
Correct!RefertoEliminateAliasingforfurtherstudy.See:DopplerEffect2.ThemaximumDopplershiftoccursatwhichangle?a.)Zer...[阅读全文]
b.)Placethesamplevolumeatagreaterdepth.
c.)Decreasethepulserepetitionfrequencyrange.
d.)SelectalowerDopplerfrequency.
Yousaid:
d).SelectalowerDopplerfrequency.
Correct!RefertoEliminateAliasingforfurtherstudy.See:DopplerEffect2.ThemaximumDopplershiftoccursatwhichangle?
(2004-12-28 06:12:53)
1.Whichpartofthetransducercomesincontactwiththepatient?
b.)StrainRelief
c.)Footprint
d.)MatchingLayer
Yousaid:
c).Footprint
Correct!Reviewthesectiononterminology.See:Terminology2.Therangeoffrequenciescontainedwithinapulseiscalledthe________________.
b.)Bandwidth
c.)PiezoelectricProperty
d.)Element
Yousa...[阅读全文]
(2004-12-28 06:09:36)
1.Whatsystemparametercouldbechangedtooptimizethisclinicalimage?
b.)Increasesamplevolumesize
c.)Increasepulserepetitionfrequency
d.)Decreasebaselinelocation
Yousaid:
c).Increasepulserepetitionfrequency
Incorrect!RefertoOptimizationTechniqueforPulsedDopplerforfurtherstudy.See:AnalysisofDopplerSignal2.Whichstatementdescribeslaminarflow?
(2004-12-28 05:48:00)
Varythesamplevolumesize.Changingthesamplevolumesizechangestheaxiallengthofthesamplevolume.Alargesamplevolumesizecanbeusedtoperformasweepofavesseltodetectverylowfloworahighvelocityjet.Oncetheflowhasbeendetectedthesamplevolumesizecanbedecreasedtoremoveunwantednoiseorspectralbroadeningfromthesignal.IfahigherDopplerfrequencyisusedanarrowerbeamisproducedcreatingasmallersamplevolumesize.Forthemostaccura...[阅读全文]
(2004-12-28 05:38:38)
TheresultsoftheDopplerultrasoundexaminationareverydependentonthesonographer.Accuracyandfinesseareacquiredbyexperience.Herearesometechniquestohelpimproveyouraccuracy.ChooseanalternateDopplerfrequency.HigherDopplerfrequenciesprovidesmallsamplevolumesizesandgreatersensitivitytosloworlowflow.WhenusinghighDopplerfrequenciespenetrationisanissue.Inthissituationonlysuperficialvesselsmaybeimagedduetothegre...[阅读全文]
