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Physics SPI Exam questions with complete solutions
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Physics SPI Exam questions with completesolutions
When nnsound nnhits nna nnboundary nnbetween nntwo nnmedia nnof nnthe nnsame nnpropagation nnspeed nnat nnoblique
nnincidence: nn- nncorrect nnanswer-no nnrefraction nnwill nnoccur.
Refraction nnrequires nnthe nnoblique nnincidence nnof nnsound nnacross nna nnboundary nnbetween nntwo nnmedia
nnwith nndifferent nnpropagation nnspeeds.
As nntransducer nnfrequency nnincreases: nn- nncorrect nnanswer-axial nnand nnlateral nnresolution nnwill nnincrease
Blood nnflow nnvolume nnchanges nnin nnthe nnbody nnare nnmainly nncontrolled nnby nnwhat nntwo nnfactors? nn- nncorrect
nnanswer-cardiac nnfunction nnand nnperipheral nnresistance
When nnreferring nnto nnblood nnflow nnvolume nnthroughout nnthe nnbody, nnthe nnbest nnanswer nnto nnthe nnquestion
nnis nncardiac nnfunction nnand nnvessel nnresistance.
Potential nnbioeffects nnof nnultrasound nncan nnbe nnminimized nnby nnwhich nnof nnthe nnfollowing? nn- nncorrect
nnanswer-reduce nnexam nntime
Reducing nnoverall nnexam nntime nnwill nnreduce nnpatient nnexposure. nnAdhering nnto nnthe nnALARA nnprinciple
nnwill nnalso nnreduce nnexposure nnby nnlimiting nnpower nnoutput nnadjustments nnand nnusing nnTGC nncontrols
nninstead. nnThe nnother nnchoices nnhave nnno nneffect nnon nnintensity.
Which nnof nnthe nnfollowing nntypes nnof nnresolution nnvaries nnwith nndifferent nndepths nnon nnthe nnimage? nn-
nncorrect nnanswer-lateral nnresolution
Lateral nnresolution nnis nnimproved nnat nnthe nnfocal nnzone nnand nnin nnthe nnnear nnfield nncompared nnto nnthe nnfar
nnfield.
,Transmit nnDelay nnor nnReceive nnFocusing nnimproves nn_____________________ nnresolution. nn- nncorrect
nnanswer-angular nnand nnazimuthal
Azimuthal nnand nnangular nnresolution nnrefer nnto nnlateral nnresolution. nnLateral nnresolution nnis nnimproved
nnwith nna nnthinner nnbeam. nnFocusing nnforms nna nnthinner nnbeam nnin nnthe nnfocal nnzone, nntherefore nnfocusing
nnimproves nnthe nnlateral nnresolution.
Which nnof nnthe nnfollowing nnis nnNOT nnadjustable nnby nnthe nnSonographer? nn- nncorrect nnanswer-Demodulation
Demodulation nnoccurs nnas nnthe nnsignal nnis nnconverted nninto nnpositive nnvoltages nn(rectification) nnand
nnsmoothed nnacross nnthe nnpeaks nnof nnthe nnvoltage nnpulses. nnThis nnprocess nnassists nnin nnprocessing nnthe
nnvoltages nnfor nnproper nnimage nndisplay nnof nnthe nnreturned nnsignals. nnThis nnis nna nnpreset nnfunction nnof nnthe
nnUS nnsystem nnand nnnot nnoperator nnadjustable.
To nnobtain nna nnlonger nnnear nnzone: nn- nncorrect nnanswer-change nnfrom nna nn3MHz nnto nna nn6MHz nntransducer.
Higher nnfrequency nnand nnlarger nnelement nndiameter nnprobes nnprovide nnthe nnlongest nnnear nnzones.
The nnmatching nnlayer nnfor nna nntransducer nnis nnusually nnmade nnof nnplastic nnand nnis nnapproximately
nn________________ nn. nn- nncorrect nnanswer-1/4 nnof nnthe nnprobe nnwavelength nnin nnthickness
The nnmatching nnlayer nnfor nna nntransducer nnis nnusually nnmade nnof nnplastic nnand nnis nnapproximately nn1/4 nnof
nnthe nnprobe nnwavelength nnin nnthickness.
Lateral nnresolution nnis nnbest nnat nnwhat nnlocation nnin nnthe nnbeam? nn- nncorrect nnanswer-focal nnpoint
If nnthe nnultrasound nnimage nnis nntoo nnblack nnand nnwhite, nnwhich nnof nnthe nnfollowing nnwill nnadd nnmore nnlevels
of nngrey nnto nnthe nnimage? nn- nncorrect nnanswer-decrease nnrejection nnlevels
Rejection nnis nnused nnto nnreduce nnthe nnamount nnof nnlow nnlevel nnechoes nndisplayed nnon nnthe nnimage. nnIf nnthe
nnimage nnis nntoo nnblack nnand nnwhite, nnreducing nnthe nnrejection nnlevel nnwill nnallow nnmore nnlow nnlevel nnechoes
nnto nnbe nndisplayed nnon nnthe nnimage. nnThis nnwill nndecrease nnthe nnblack nnand nnwhite nnappearance nnand
nnincrease nnthe nnlevels nnof nngrey nndisplayed.
, _______________ nnis nndefined nnas nnthe nntime nnit nntakes nnto nncomplete nnone nncycle. nn- nncorrect nnanswer-
Period
Period nnis nndefined nnas nnthe nntime nnit nntakes nnto nncomplete nnone nncycle.
The nnability nnto nndifferentiate nna nnhyperechoic nnhemangioma nnwithin nnthe nnhypoechoic nnliver nntissue nnis
nndue nnto nnwhat nntype nnof nnimage nnresolution? nn- nncorrect nnanswer-contrast nnresolution
Contrast nnresolution nnrefers nnto nnthe nnability nnto nndifferentiate nndifferent nnintensities nn(shades nnof nnblack,
nnwhite nnand nngrey) nnon nnthe nnultrasound nnimage. nnCompression nncan nnbe nnused nnto nnalter nnthe nndynamic
nnrange nnof nnthe nnimage nnwhich nnaffects nnthe nncontrast. nnLower nncompression nn= nnlarger nndynamic nnrange nn=
nnimproved nncontrast nnresolution nn= nnlower nnimage nncontrast nn= nnmore nnshades nnof nngray nnon nnthe nnimage
Harmonic nnimaging nnleads nnto nn: nn- nncorrect nnanswer-decreased nnimage nnclutter
Tissue nnharmonic nnimaging nnreduces nnnoise nnand nnclutter nnby nnimproving nnsignal nnto nnnoise nnratio nnand
nnresolution. nnAs nnan nnultrasound nnwave nnpropagates nnthrough nnthe nnmedia, nna nnchange nnoccurs nnin nnthe
nnshape nnand nnfrequency nnof nnthe nntransmitted nnsignal. nnThe nnchange nnis nndue nnto nnthe nnnormal nnresistance
nnof nntissue/particles nnto nnpropagate nnsound nnenergy. nnThis nnresistance nnand nnthe nnresulting nnsignal nnchange
nnis nncalled nna nnharmonic nnoscillation.
The nninput nnfrequency nndoubles nnthe nnoutput nnfrequency nnin nnharmonic nnimaging. nnEX: nntransmit
nnfrequency nnof nn4.0 nnMHz. nnfor nnmaximum nnpenetration nnwith nna nnreturn nnharmonic nnfrequency nnof nn8.0
nnMHz nnfor nnimproved nnresolution. nnThe nnreturning nnhigher nnfrequency nnsignal nnhas nnto nnonly nntravel nnone
nndirection nnto nnthe nnprobe. nnThe nnadvantages nnof nnhigh nnfrequency nnimaging nnand nnthe nnone-way nntravel
nneffect nnare nndecreased nnreverberation, nnbeam nnaberration, nnand nnside nnlobes, nnas nnwell nnas nnincreased
nnresolution.
Which nnof nnthe nnfollowing nnlists nnall nnof nnthe nncomponents nnof nnthe nnUS nnsystem? nn- nncorrect nnanswer-
transducer, nnreceiver, nnmemory, nnpulser, nndisplay
An nnultrasound nnsystem nncontains nn5 nnmain nncomponents: nnpulser, nntransducer, nnreceiver,
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