SPI REVIEW QUESTIONS: DOPPLER QUESTIONS AND CORRECT ANSWERS

SPI REVIEW QUESTIONS: DOPPLER
QUESTIONS AND CORRECT ANSWERS
AccordingA2toA2theA2BernoulliA2Principle,A2whereA2willA2youA2findA2theA2lowestA2pressureA2i
nA2aA2vesselA2withA2stenosis?A2

A.A2proximalA2toA2theA2stenosis
B.A2distalA2toA2theA2stenosis
C.A2inA2theA2collateralA2vessels
D.A2atA2theA2siteA2ofA2stenosisA2-A2Ans--D.A2atA2theA2siteA2ofA2stenosis

WhichA2ofA2theA2followingA2isA2aA2systemA2adjustmentA2thatA2isA2madeA2whenA2changingA2
fromA2aA2lowerA2extremityA2arterialA2examA2toA2aA2lowerA2extremityA2venousA2examA2onA2t
heA2sameA2patient?A2

A.A2reverseA2theA2colorA2displayA2baseline
B.A2decreaseA2transducerA2frequency
C.A2decreaseA2DopplerA2scale
D.A2changeA2theA2cursorA2angleA2toA20A2degreesA2-A2Ans--C.A2decreaseA2dopplerA2scale

TheA2primaryA2advantageA2ofA2continuousA2waveA2DopplerA2is:A2

A.A2ImageA2depth
B.A2RangeA2discrimination
C.A2AbsenceA2ofA2theA2NyquistA2limit
D.A2ReducedA2aliasingA2-A2Ans--C.A2AbsenceA2ofA2theA2nyquistA2limit

BloodA2isA2flowingA2towardA2aA27MHzA2transducer;A2youA2expectA2theA2reflectedA2frequen
cyA2toA2beA2_______A27MHz.A2

A.A2greaterA2than
B.A2lessA2than
C.A2constantA2at
D.A2oneA2halfA2ofA2-A2Ans--A.A2greaterA2than

WhatA2isA2theA2averageA2NyquistA2limitA2forA2aA25MHzA2CWA2DopplerA2probe?A2

A.A215kHz
B.A210kHz
C.A27kHz
D.A2NoneA2ofA2theA2aboveA2-A2Ans--D.A2noneA2ofA2theA2above

-continousA2waveA2dopplerA2isA2notA2limitedA2byA2PRFA2orA2theA2nyquistA2limit.

,TheA2bestA2angleA2ofA2insonationA2toA2produceA2theA2mostA2accurateA2DopplerA2shiftA2info
rmationA2is_________degrees.A2

A.A20
B.A245
C.A260
D.A290A2-A2Ans--A.A20

WhichA2ofA2theA2followingA2parametersA2isA2displayedA2onA2theA2y-
axisA2onA2aA2DopplerA2tracing?A2

A.A2speed
B.A2time
C.A2frequencyA2shift
D.A2motionA2-A2Ans--C.A2frequencyA2shift

TheA2termA2__________________A2refersA2toA2whenA2allA2layersA2ofA2bloodA2flowA2areA2
movingA2atA2relativelyA2theA2sameA2speed.

A.A2LaminarA2flow
B.A2ReynoldsA2flow
C.A2EddyA2currents
D.A2PlugA2flowA2-A2Ans--D.A2PlugA2flow

WhatA2isA2laminarA2flow?A2-A2Ans--
bloodA2flowA2layersA2movingA2atA2slightlyA2differentA2speedsA2withA2theA2highestA2velocityA
2inA2theA2center


WhatA2isA2theA2methodA2usedA2toA2estimateA2theA2ankleA2bloodA2pressureA2inA2aA2standin
gA2patient?A2

A.A2AddA2100mmHgA2toA2theA2systolicA2bloodA2pressure
B.A2SystolicA2bloodA2pressureA2xA22
C.A2AddA2100mmHgA2toA2theA2diastolicA2bloodA2pressure
D.A2DiastolicA2bloodA2pressureA2xA22A2-A2Ans--
A.A2addA2100mmHgA2toA2theA2systolicA2bloodA2pressure

.A2AA2Reynold'sA2numberA2greaterA2thanA2______________A2indicatesA2turbulentA2flowA2o
nA2___________A2evaluation.A2

A.A22000,A2colorA2Doppler
B.A2500,A2colorA2Doppler
C.A2500,A2PWA2Doppler
D.A22000,A2PWA2DopplerA2-A2Ans--AA22000,A2colorA2Doppler

, .A2__________________A2isA2theA2termA2usedA2toA2describeA2theA2concentricA2layersA2ofA
2bloodA2flowA2withinA2aA2normalA2vessel.A2


A.A2turbulence
B.A2laminarA2flow
C.A2plugA2flow
D.A2DopplerA2shiftA2-A2Ans--B.A2laminarA2flow

IfA2theA2peakA2pressureA2gradientA2inA2aA2vesselA2isA236mmHg,A2whatA2isA2theA2velocityA2o
fA2theA2flow?A2

A.A21A2cm/s
B.A23A2m/s
C.A22A2cm/s
D.A24A2cm/sA2-A2Ans--B.A23A2m/s

benouliA2equationA2-A2Ans--PPG=4xvelocity2


toA2figureA2outA2velocity

vel=ppg/4A2whatA2isA2theA2squareA2rootA2ofA2theA2answer?

.A2WhatA2isA2theA2cosineA2ofA260A2degrees?A2

A.A20
B.A20.5
C.A20.7575
D.A21A2-A2Ans--B.A20.5

18.A2AllA2ofA2theA2followingA2correctlyA2describeA2aA2CWA2DopplerA2evaluation,A2except?A2

A.A2CWA2DopplerA2isA2mostA2usefulA2withA2highA2velocityA2flow.
B.A2CWA2DopplerA2tracingsA2willA2notA2demonstrateA2aA2spectralA2window.
C.A2CWA2DopplerA2transducersA2containA2atA2leastA2twoA2elements,A2oneA2thatA2transmits
A2soundA2andA2oneA2thatA2receivesA2theA2reflections.
D.A2TheA2angleA2ofA2incidenceA2doesA2notA2affectA2theA2velocityA2evaluationA2usingA2CWA2
DopplerA2becauseA2youA2areA2notA2evaluatingA2theA2vesselA2atA2aA2specificA2depth.A2-
A2Ans--
D.A2TheA2angleA2ofA2incidenceA2doesA2notA2affectA2theA2velocityA2evaluationA2usingA2CWA2
DopplerA2becauseA2youA2areA2notA2evaluatingA2theA2vesselA2atA2aA2specificA2depth.

WhichA2ofA2theA2followingA2factorsA2doesA2NOTA2affectA2theA2DopplerA2shift?A2

A.A2transducerA2elementA2thickness
B.A2transducerA2elementA2width