COMPUTED TOMOGRAPHY FOR
TECHNOLOGISTS 2ND EDITION EXAM
REVIEW GRADED A+
Which ris rNOT ra rsynonym rfor rthe rpreliminary/localizer rimage rtaken rat rthe rstart rof ra
rCT rexamination?
A. rTopogram
B. rScout
C. rScanogram
D. rSpiral r- rcorrect ranswers r-D. rSpiral
The rability rof ra rsystem rto rdifferentiate, ron rthe rimage, robjects rwith rsimilar rdensities
ris rknown ras:
A. rHigh rcontrast rresolution
B. rLow rcontrast rresolution
C. rSpatial rresolution
D. rTemporal rresolution r- rcorrect ranswers r-B. rLow rcontrast rresolution
,Each rtwo rdimensional rsquare rof rdata rthat rmake rup rthe rCT rimage ris rcalled ra:
A. rPixel
B. rVoxel
C. rMatrix
D. rFragment r- rcorrect ranswers r-A. rPixel
How rmany rpixels rare rcontained rin ra r1,024 rmatrix rimage? rA. r1,024
B. r2,048
C. r262,144
D. r1,048,576 r- rcorrect ranswers r-D. r1,048,576
Beam rattenuation rcan rbe rdefined ras:
A. rThe rphenomenon rby rwhich rartifacts rresult rwhen rlower renergy rphotons rare
rpreferentially rabsorbed, rleaving ronly rhigher-intensity rphotons rto rstrike rthe rdetector
rarray.
B. rXray renergy rthat ris rproduced rfrom rbombarding ra rsubstance rwith rfast rmoving
relectrons.
C. rThe rability rof rthe rdetector rto rcapture rtransmitted rphotons rand rchange rthem rto
relectronic rsignals.
D. rThe rphenomenon rby rwhich ran rxray rbeam rpassing rthrough ra rstructure ris
rdecreased rin rintensity ror ramount rbecause rof rabsorption rand rinteraction rwith
rmatter. r- rcorrect ranswers r-D. rThe rphenomenon rby rwhich ran rxray rbeam rpassing
rthrough ra rstructure ris rdecreased rin rintensity ror ramount rbecause rof rabsorption rand
rinteraction rwith rmatter.
Which rof rthe rfollowing ris ra rlow rattenuation rstructure:
A. rIodine rfilled raorta
B. rRib
C. rTrachea
D. rCalcified rarteries r- rcorrect ranswers r-C. rTrachea
An robject ris rslightly rless rdense rthan rwater. rWhat ris rthe rexpected rhounsfield
rmeasurement?
A. r-940
B. r-10
C. r50
D. r850 r- rcorrect ranswers r-B. r-10
Why rdoes rthe radministration rof riodinated rcontrast rmedia rresult rin ran renhanced
rimage?
A. rIodinated rcontrast rmaterial rincreases rthe rability rof rthe renhanced rstructure rto
rattenuate rthe rxray rbeam.
B. rIodinated rcontrast rmaterial rdecreases rthe raverage rphoton renergy rof rthe rxray
rbeam; rtherefore rmore rphotons rare rabsorbed rby rthe rpatient.
C. rThe radministration rof rcontrast rmaterial rresults rin ra rsmaller rpixel, rthereby
rincreasing rspatial rresolution, rwhich rresults rin ran renhanced rimage.
,D. r- rcorrect ranswers r-A. rIodinated rcontrast rmaterial rincreases rthe rability rof rthe
renhanced rstructure rto rattenuate rthe rxray rbeam.
The rxray rbeam rsources rfor rCT rproduce rxray renergy rthat ris rpolychromatic. rThis
rmeans:
A. rWhen rviewed rby rthe rnaked reye, rthe rbeam rexhibits rmany rdifferent rcolors.
B. rIt rproduce, ras ra rbyproduct, ra rsubstance rknown ras rpolychlorinated rbiphenyl.
C. rPhotons rcontained rin rthe rbeam rare rall rof rthe rsame rwavelength.
D. rThe rbeam rcomprises rphotons rwith rvarying renergies. r- rcorrect ranswers r-D. rThe
rbeam rcomprises rphotons rwith rvarying renergies.
An robject rthat rappears ron rthe rimage rbut ris rnot rpresent rin rthe robject rscanned ris
rcalled ra/n:
A. rArtifact
B. rAnomaly
C. rShadow
D. rGhost r- rcorrect ranswers r-A. rArtifact
Which ris ran radvantage rof rfiltering rthe rxray rbeam?
A. rFiltering rreduces rthe ranode rheat rload
B. rA rfiltered rbeam rproduces rimages rwith rsubstantially rless rquantum rmottle
C. rFiltering rthe rbeam rprevents renergy rfrom rbeing rconverted rto rheat, rtherefore
r100% rof rthe renergy ris rconverted rto rxrays.
D. rFiltering rreduces rthe rradiation rdose rto rthe rpatient. r- rcorrect ranswers r-D. rFiltering
rreduces rthe rradiation rdose rto rthe rpatient
Scan rthickness ris rprimarily rimportant rfor rthe rpart rit rplays rin:
A. rNoise rreduction
B. rThe rcontrast rscale
C. rDetector raperture ropening
D. rVolume raveraging r- rcorrect ranswers r-D. rVolume raveraging
You rare rworking rwith rthe rradiologist rto restablish rexamination rprotocols rfor ryour
rdepartment. rWhich rof rthe rfollowing ris ra rlogical rconsideration rwhen rdetermining ran
rappropriate rslice rthickness rfor rstudies rof rthe rinternal rauditory rcanal?
A. rBecause rthe rauditory rossicles rare rquite rsmall, ra rthin rslice rwill rbe rnecessary rto
rreduce rthe rchance rthat rvolume raveraging rwill robscure rtheir rappearance ron rthe
rimage.
B. rThe rappropriate rslice rthickness rwill rvary rconsiderably rfrom rpatient rto rpatient.
rTherefore, reach rtechnologist rshould rbe rfree rto radjust rthe rslice rthickness ras rhe ror
rshe rdeems rnecessary rfor rthe rparticular rpatient.
C. rA rslice rthickness rof r5 rto r7mm ris radequate rbecause rthe rstructures rof rinterest
rare rnot rparticularly rsmall rand rthe rexamination ris rmost roften rordered ras ra
rscreening rstudy rfor rasymptomatic rpatients.
D. rThe rthickest rslice ravailable rshould rbe rused rto rreduce rthe rradiation rdose rto rthe
rcorneas. r- rcorrect ranswers r-A. rBecause rthe rauditory rossicles rare rquite rsmall, ra
, rthin rslice rwill rbe rnecessary rto rreduce rthe rchance rthat rvolume raveraging rwill
robscure rtheir rappearance ron rthe rimage.
How rmany rCT rnumbers rare rassigned rto reach rpixel rin rthe rimage rmatrix?
A. rOne rhalf rthe rnumber rof rall rvalues rrecorded rfrom rthe rdetector rarray
B. rOne
C. rThe rnumber rof rHU rper rpixel ris rone rtenth rthe rdisplay rfield rof rview
D. rTwo rvalues rfor ra r256 rmatrix; r4 rvalues rfor ra r512 rmatrix r- rcorrect ranswers r-B.
rOne
Which ris ranother rname rfor rraw rdata?
A. rImage rdata
B. rScan rdata
C. rReconstructed rdata
D. rDisplayed rdata r- rcorrect ranswers r-B. rScan rdata
When rin rthe ranatomic rposition, rthe rarms rare:
A. rraised rabove rthe rhead, rpalms rbackwards
B. rcrossed rover rthe rchest, rpalms ron ropposite rshoulders
C. rdown rby rthe rsides, rpalms rforward
D. rby rthe rsides, relbows rbent, rpalms rbackward rand rresting ron rhips r- rcorrect
ranswers r-C. rdown rby rthe rsides, rpalms rforward
Which rof rthe rfollowing rcomponents ris rNOT rhoused rwithin rthe rgantry?
A. rThree rphase rgenerator
B. rHigh-frequency rgenerator
C. rSlip rrings
D. rXenon rgas rdetectors r- rcorrect ranswers r-A. rThree rphase rgenerator
The rpower rcapacity rof rthe rgenerator ris rlisted rin:
A. rmilliamperes r(mA)
B. rthousand rheat runits r(KHU)
C. rmillion rheat runits r(MHU)
D. rkilowatts r(kW) r- rcorrect ranswers r-D. rkilowatts r(kW)
Which rof rthe rfollowing rdescribes ra rslip rring rdevice?
A. rA rrecoiling rsystem rcable rused rto rrotate rthe rgantry rframe
B. rA rbrushlike rapparatus rthat rprovides rcontinuous relectrical rpower rand relectronic
rcommunication racross ra rrotating rsurface
C. rA rdevice rused rto rshape rthe rxray rbeam, rthereby rreducing rthe rradiation rdose rto
rthe rpatient rand rreducing rimage rartifact
D. rA rdevice rthat rrestricts rthe rxray rbeam remerging rfrom rthe rgantry rto rthin rribbons r-
rcorrect ranswers r-B. rA rbrushlike rapparatus rthat rprovides rcontinuous relectrical rpower
rand relectronic rcommunication racross ra rrotating rsurface
Which ris ra rdisadvantage rof ra rsmall rfocal rspot rsize?
TECHNOLOGISTS 2ND EDITION EXAM
REVIEW GRADED A+
Which ris rNOT ra rsynonym rfor rthe rpreliminary/localizer rimage rtaken rat rthe rstart rof ra
rCT rexamination?
A. rTopogram
B. rScout
C. rScanogram
D. rSpiral r- rcorrect ranswers r-D. rSpiral
The rability rof ra rsystem rto rdifferentiate, ron rthe rimage, robjects rwith rsimilar rdensities
ris rknown ras:
A. rHigh rcontrast rresolution
B. rLow rcontrast rresolution
C. rSpatial rresolution
D. rTemporal rresolution r- rcorrect ranswers r-B. rLow rcontrast rresolution
,Each rtwo rdimensional rsquare rof rdata rthat rmake rup rthe rCT rimage ris rcalled ra:
A. rPixel
B. rVoxel
C. rMatrix
D. rFragment r- rcorrect ranswers r-A. rPixel
How rmany rpixels rare rcontained rin ra r1,024 rmatrix rimage? rA. r1,024
B. r2,048
C. r262,144
D. r1,048,576 r- rcorrect ranswers r-D. r1,048,576
Beam rattenuation rcan rbe rdefined ras:
A. rThe rphenomenon rby rwhich rartifacts rresult rwhen rlower renergy rphotons rare
rpreferentially rabsorbed, rleaving ronly rhigher-intensity rphotons rto rstrike rthe rdetector
rarray.
B. rXray renergy rthat ris rproduced rfrom rbombarding ra rsubstance rwith rfast rmoving
relectrons.
C. rThe rability rof rthe rdetector rto rcapture rtransmitted rphotons rand rchange rthem rto
relectronic rsignals.
D. rThe rphenomenon rby rwhich ran rxray rbeam rpassing rthrough ra rstructure ris
rdecreased rin rintensity ror ramount rbecause rof rabsorption rand rinteraction rwith
rmatter. r- rcorrect ranswers r-D. rThe rphenomenon rby rwhich ran rxray rbeam rpassing
rthrough ra rstructure ris rdecreased rin rintensity ror ramount rbecause rof rabsorption rand
rinteraction rwith rmatter.
Which rof rthe rfollowing ris ra rlow rattenuation rstructure:
A. rIodine rfilled raorta
B. rRib
C. rTrachea
D. rCalcified rarteries r- rcorrect ranswers r-C. rTrachea
An robject ris rslightly rless rdense rthan rwater. rWhat ris rthe rexpected rhounsfield
rmeasurement?
A. r-940
B. r-10
C. r50
D. r850 r- rcorrect ranswers r-B. r-10
Why rdoes rthe radministration rof riodinated rcontrast rmedia rresult rin ran renhanced
rimage?
A. rIodinated rcontrast rmaterial rincreases rthe rability rof rthe renhanced rstructure rto
rattenuate rthe rxray rbeam.
B. rIodinated rcontrast rmaterial rdecreases rthe raverage rphoton renergy rof rthe rxray
rbeam; rtherefore rmore rphotons rare rabsorbed rby rthe rpatient.
C. rThe radministration rof rcontrast rmaterial rresults rin ra rsmaller rpixel, rthereby
rincreasing rspatial rresolution, rwhich rresults rin ran renhanced rimage.
,D. r- rcorrect ranswers r-A. rIodinated rcontrast rmaterial rincreases rthe rability rof rthe
renhanced rstructure rto rattenuate rthe rxray rbeam.
The rxray rbeam rsources rfor rCT rproduce rxray renergy rthat ris rpolychromatic. rThis
rmeans:
A. rWhen rviewed rby rthe rnaked reye, rthe rbeam rexhibits rmany rdifferent rcolors.
B. rIt rproduce, ras ra rbyproduct, ra rsubstance rknown ras rpolychlorinated rbiphenyl.
C. rPhotons rcontained rin rthe rbeam rare rall rof rthe rsame rwavelength.
D. rThe rbeam rcomprises rphotons rwith rvarying renergies. r- rcorrect ranswers r-D. rThe
rbeam rcomprises rphotons rwith rvarying renergies.
An robject rthat rappears ron rthe rimage rbut ris rnot rpresent rin rthe robject rscanned ris
rcalled ra/n:
A. rArtifact
B. rAnomaly
C. rShadow
D. rGhost r- rcorrect ranswers r-A. rArtifact
Which ris ran radvantage rof rfiltering rthe rxray rbeam?
A. rFiltering rreduces rthe ranode rheat rload
B. rA rfiltered rbeam rproduces rimages rwith rsubstantially rless rquantum rmottle
C. rFiltering rthe rbeam rprevents renergy rfrom rbeing rconverted rto rheat, rtherefore
r100% rof rthe renergy ris rconverted rto rxrays.
D. rFiltering rreduces rthe rradiation rdose rto rthe rpatient. r- rcorrect ranswers r-D. rFiltering
rreduces rthe rradiation rdose rto rthe rpatient
Scan rthickness ris rprimarily rimportant rfor rthe rpart rit rplays rin:
A. rNoise rreduction
B. rThe rcontrast rscale
C. rDetector raperture ropening
D. rVolume raveraging r- rcorrect ranswers r-D. rVolume raveraging
You rare rworking rwith rthe rradiologist rto restablish rexamination rprotocols rfor ryour
rdepartment. rWhich rof rthe rfollowing ris ra rlogical rconsideration rwhen rdetermining ran
rappropriate rslice rthickness rfor rstudies rof rthe rinternal rauditory rcanal?
A. rBecause rthe rauditory rossicles rare rquite rsmall, ra rthin rslice rwill rbe rnecessary rto
rreduce rthe rchance rthat rvolume raveraging rwill robscure rtheir rappearance ron rthe
rimage.
B. rThe rappropriate rslice rthickness rwill rvary rconsiderably rfrom rpatient rto rpatient.
rTherefore, reach rtechnologist rshould rbe rfree rto radjust rthe rslice rthickness ras rhe ror
rshe rdeems rnecessary rfor rthe rparticular rpatient.
C. rA rslice rthickness rof r5 rto r7mm ris radequate rbecause rthe rstructures rof rinterest
rare rnot rparticularly rsmall rand rthe rexamination ris rmost roften rordered ras ra
rscreening rstudy rfor rasymptomatic rpatients.
D. rThe rthickest rslice ravailable rshould rbe rused rto rreduce rthe rradiation rdose rto rthe
rcorneas. r- rcorrect ranswers r-A. rBecause rthe rauditory rossicles rare rquite rsmall, ra
, rthin rslice rwill rbe rnecessary rto rreduce rthe rchance rthat rvolume raveraging rwill
robscure rtheir rappearance ron rthe rimage.
How rmany rCT rnumbers rare rassigned rto reach rpixel rin rthe rimage rmatrix?
A. rOne rhalf rthe rnumber rof rall rvalues rrecorded rfrom rthe rdetector rarray
B. rOne
C. rThe rnumber rof rHU rper rpixel ris rone rtenth rthe rdisplay rfield rof rview
D. rTwo rvalues rfor ra r256 rmatrix; r4 rvalues rfor ra r512 rmatrix r- rcorrect ranswers r-B.
rOne
Which ris ranother rname rfor rraw rdata?
A. rImage rdata
B. rScan rdata
C. rReconstructed rdata
D. rDisplayed rdata r- rcorrect ranswers r-B. rScan rdata
When rin rthe ranatomic rposition, rthe rarms rare:
A. rraised rabove rthe rhead, rpalms rbackwards
B. rcrossed rover rthe rchest, rpalms ron ropposite rshoulders
C. rdown rby rthe rsides, rpalms rforward
D. rby rthe rsides, relbows rbent, rpalms rbackward rand rresting ron rhips r- rcorrect
ranswers r-C. rdown rby rthe rsides, rpalms rforward
Which rof rthe rfollowing rcomponents ris rNOT rhoused rwithin rthe rgantry?
A. rThree rphase rgenerator
B. rHigh-frequency rgenerator
C. rSlip rrings
D. rXenon rgas rdetectors r- rcorrect ranswers r-A. rThree rphase rgenerator
The rpower rcapacity rof rthe rgenerator ris rlisted rin:
A. rmilliamperes r(mA)
B. rthousand rheat runits r(KHU)
C. rmillion rheat runits r(MHU)
D. rkilowatts r(kW) r- rcorrect ranswers r-D. rkilowatts r(kW)
Which rof rthe rfollowing rdescribes ra rslip rring rdevice?
A. rA rrecoiling rsystem rcable rused rto rrotate rthe rgantry rframe
B. rA rbrushlike rapparatus rthat rprovides rcontinuous relectrical rpower rand relectronic
rcommunication racross ra rrotating rsurface
C. rA rdevice rused rto rshape rthe rxray rbeam, rthereby rreducing rthe rradiation rdose rto
rthe rpatient rand rreducing rimage rartifact
D. rA rdevice rthat rrestricts rthe rxray rbeam remerging rfrom rthe rgantry rto rthin rribbons r-
rcorrect ranswers r-B. rA rbrushlike rapparatus rthat rprovides rcontinuous relectrical rpower
rand relectronic rcommunication racross ra rrotating rsurface
Which ris ra rdisadvantage rof ra rsmall rfocal rspot rsize?
