Correct And Verified Answers
Whichiofitheifollowingidoitheisourceianditheimediumidetermine?
a.idutyifactor
b.ifrequency
c.ipropagationispeed
d.iaxialiresolutioni-iCorrectiAnswer-d.
AxialiresolutioniisiaffectedibyialliofitheifollowingiEXCEPT
a.ifrequency
b.idamping
c.ispatialipulseilength
d.ifocusingi-iCorrectiAnswer-d.
Dampingiiniaitransducer
a.ireducesitheinumberioficyclesiiniaipulseiandiincreasesitheiqualityifactor
b.iincreasesitheinumberioficyclesiiniaipulseiandiincreasesipenetration
c.icausesipooriaxialiandilateraliresolution
d.ireducesitheidutyifactoriandiincreasesitheirangeiofitransmittedifrequenciesi-
iCorrectiAnswer-d.
Farizoneibeamidivergenceicanibeireducedioniaisingle-
elementitransduceribyiusing
a.iaitransduceriwithiaismallerielementidiameter
b.iaihigherifrequencyitransducer
c.iailowerifrequencyitransducerioriaismallerielementidiameter
d.iadjustableifocusingi-iCorrectiAnswer-b.
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,Theiareaibetweenitheifaceiofianiunfocusedisingle-
elementitransducerianditheipointiwhereitheibeamistartsitoidivergeiisithe
a.iFraunhoferizone
b.irefractionizone
c.ifocalizone
d.inearizonei-iCorrectiAnswer-d.
Assumingiaifixedifrequency,iwhatihappensiifitheidiameteriofianiunfocuseditran
sduceriisiincreased?
a.itheifarizoneidivergenceiincreases
b.itheipenetrationidecreases
c.itheilengthiofitheinearizoneiincreases
d.itheilengthiofitheinearizoneidecreasesi-iCorrectiAnswer-c.
WhichiofitheifollowingidoesiNOTiaffectilateraliresolution?
a.ifocusing
b.ielementidiameter
c.ifrequency
d.ibandwidthi-iCorrectiAnswer-d.
Higherifrequencyitransducersiprovide
a.iimprovedilateraliresolution
b.ismalleriDopplerishifts
c.iimprovediaxialiresolutioniandireducediattenuation
d.iincreasedipenetrationi-iCorrectiAnswer-a.
Ultrasoundiwavesithatiareitravelingithroughiaimediumiconsistiof
a.ielectromagneticiandiradioifrequencies
b.icompressionsiandirefractions
c.ielectromagneticiandiionizingifrequencies
d.icompressionsiandirarefactionsi-iCorrectiAnswer-d.
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,Whatiisitheidifferenceibetweeniaudibleisoundiandiultrasound?
a.iaudibleisoundiwavesicanitravelithroughiaivacuum
b.iaudibleisoundihasiaihigherifrequency
c.iultrasoundihasiaihigherifrequency
d.iultrasoundiwavesiareiionizingi-iCorrectiAnswer-c.
Aidecreaseiinitheithicknessiofiaipiezoelectricielementiwilliresultiin
a.iaigreateripulseiduration
b.ianiincreaseiinitheipropagationispeed
c.iaidecreaseiinitheiqualityifactoriifitheibandwidthidecreases
d.ianiincreaseiinitheifrequencyiofitheitransduceri-iCorrectiAnswer-d.
Theiresonantifrequencyiofiaipulsed-
waveiultrasounditransduceriisidependention
a.idamping
b.itheibackingimaterial
c.itheithicknessiofitheipiezoelectricielementianditheispeediofisoundithroughithe
ipiezoelectricielement
d.itheiamplitudeiofitheivoltageiapplieditoitheipiezoelectricielementi-
iCorrectiAnswer-c.
Theiimageiisibrighteriatitheileveliofitheifocalizone.iWhichiofitheifollowingicontr
olsiisibestitoicorrectithis?
a.ioveralligain
b.iTGC
c.iacousticipower
d.iPRFi-iCorrectiAnswer-b.
Ifitheifrequencyiisidoubled,
a.itheidutyifactoriwilliincrease
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, b.itheiperiodiwillidouble
c.itheiwavelengthiwillidouble
d.itheiwavelengthiwillibeione-halfi-iCorrectiAnswer-d.
Theitypicalirangeiofipulseirepetitionifrequenciesiiniaipulse-
echoiultrasoundisystemiis
a.i2,000iHzitoi20,000iHz
b.i20iMHzitoi200iMHz
c.i20,000iHzitoi200,000iHz
d.i1,000iHzitoi2,000iHzi-iCorrectiAnswer-d.
Ifitheinumberioficyclesiiniaipulseiisireduced,
a.itheipulseirepetitionifrequencyiisiautomaticallyireduced
b.itheispatialipulseilengthiincreases
c.itheipulseidurationiisireducediwhichiresultsiiniailoweridutyifactor
d.itheibandwidthiisidecreasedianditheiqualityifactoriisiincreasedi-
iCorrectiAnswer-c.
Theiminimumireflectoriseparationirequireditoiproduceiseparateiechoesiis
a.itheispatialiresolutioniofitheiultrasoundisystem
b.itheitemporaliresolution
c.itheiattenuationicoefficient
d.itheitotaliattentuationi-iCorrectiAnswer-a.
Asitheifrequencyiofisoundiincreases,
a.itheiamountiofiscatteriisiincreased
b.itheiattenuationidecreases
c.itheiamountiofiscatteridecreases
d.itheipenetrationiincreasesi-iCorrectiAnswer-a.
Whichiofitheifollowingitransducersiprovidesitheimaximumipenetration?
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