ARDMS SPI Exam Study Guide With 10% Complete Solution

ARDMS SPI Exam Study Guide With 10%
Complete Solution
Inisoftitissue,iifitheifrequencyiofiaiwaveiisiincreaseditheiPro
pagationiSpeedi(PS)iwill...i-iCorrectiAnswer-
RemainitheiSameibecauseistiffnessiandidensityiaffectiProp
agationiSpeed.

Whatiisitheiaudibleirange?i-iCorrectiAnswer-20-20,000Hz

>20,000Hz=Ultrasound

Frequencyiisimeasurediini-iCorrectiAnswer-Hertzi(Hz)
isi
CyclesiperiSecond

Notiaffectedibyisonographeri

IncreaseiFrequency;iDecreaseiDepth

Aiperiodiisitheilengthiofitimeiititakesifori-iCorrectiAnswer-
oneicompleteiwavelengthitoipassiaifixedipoint

PRPiisideterminedibyi-iCorrectiAnswer-
Transmititimeiandireceiveitime.

Periodiisimeasurediini-iCorrectiAnswer-Timei(μs)

Whenitheisonographerichangesitheiimagingidepthiwhatipa
rametersiareichanged?i-iCorrectiAnswer-
PRP,iPRF,iDutyiFactor




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,Whatiisidutyifactor?i-iCorrectiAnswer-
Theipercentageiorifractioniofitimeithatitheisystemiisitransm
ittingiaipulsei(TimeiSoundiisiONioriON-Time).

PropagationiSpeediiniSOFTiTISSUEi-iCorrectiAnswer-
1.54imm/μs
(1540im/sec)

UnitiofimeasurementiforiPulseiDuration,iDutyiFactor,iPRP,i
andiPeriodi-iCorrectiAnswer-Time,i(μs)

Pulseidurationiisideterminedibyi-iCorrectiAnswer-
SoundiSourceiOnly

PulseiDurationiisicontrolledibyi-iCorrectiAnswer-
theiultrasoundisystemianditransducer

PulseiDurationiFormulai-iCorrectiAnswer-
pulseidurationi(μs)i=i#icyclesiinipulse/frequency(MHz)

PD=iNumberioficyclesiiniPulse/iFrequency(Hz)

SpatialiPulseiLengthi(SPL)i(measurement)i-
iCorrectiAnswer-

Theidistanceithatiaipulseioccupiesiinispaceifromitheistartitoi
theiendiofiaipulse.i
(mm)

Typicalivaluesiforispatialipulseilengthiinisoftitissue.i-
iCorrectiAnswer-0.1itoi1.0imm



Spatialipulseilengthiisideterminedibyi-iCorrectiAnswer-
soundisourceiandimedium



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, SpatialiPulseiLengthiisidirectlyiproportionalitoi-
iCorrectiAnswer-theiNumberiofiCyclesiinitheiPulse

andi
theiWavelength

(DirectlyiProportionalimeansithatiincreasediSPLiwilliincrea
seibothitheinumberioficyclesiinitheipulseianditheiwavelengt
hiifiincreased).

Spatialipulseilengthiisiinverselyiproportionalitoi-
iCorrectiAnswer-Frequencyi(MHz)



(InverselyiProportionalimeansithatiincreasediSPLiwillilowe
rifrequency.iThisiisibecauseiaxialiresolutioniisibetteriwithilo
werifrequency)

PulseiDurationi(PD)i-iCorrectiAnswer-
Theiactualitimeifromitheistartiofiaipulseitoitheiendiofithatipu
lse;iaisingleitransmit,italking,iori"on"itime.i
Timeitheipulseiisionitypicallyimeasurediini(ms).

PulseiLengthi-iCorrectiAnswer-
Theidistanceiofitheipulseistartitoiendiorithe
durationiorilengthiofiaisingleipulsei
PulseiLengthiisitypicallyimeasurediini(mm).

theiabilityiofianiobjectitoiresisticompressioniandirelatesitoit
heihardnessiofiaimedium?i-iCorrectiAnswer-Stiffness.i

Think:
↑iStiffnessi↑iSpeed
↓iDensityi↑iSpeed




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