GXMO PRACTICE TEST QUESTIONS AND ANSWERS
GRADED A+
collimatorz-zCORRECTzANSWER-beamzrestrictingzdevicezwithz2-3zsetszofzleadzshuttersztozlimitzthezx-
rayzbeamztozchangezthezfieldzsizezandzshape.zEquippedzwithzazlightztozdisplayzthezexposurezfield.
film-basedzcassettez-zCORRECTzANSWER-
imageziszcapturedzonzfilmztozbezprocessed.zThezcassettezcontainszthezfilmzandz1-
2zscreenszinzazprotectivezcase.zThezscreenszhaveztheirzownzprotectionzwithzthezphosphorzandzreflectivezla
yers.zThezfilmzgoeszunderzthezscreenzwithzthezemulsionzlayerzfacingzit.
CR-basedzcassettez-zCORRECTzANSWER-
houseszthezimagingzplatezwhichzactszthroughzphosphors.zThezIPzhaszprotectivezlayers,zbackingzwithzphosp
horszandzreflectivezlayerszbetweenzsimilarztozfilm.zThezphosphorziszazphotostimulablezphosphorzofzbarium
zfluoridezcrystalszwithzeuropium.
DR-basedzcassettez-zCORRECTzANSWER-
canzbezeitherzdirectzorzindirect.zIndirectzuseszazCCD,zwhichziszlightzsensitivezwithzazwidezdynamiczrange.zTh
ezphosphorzusedziszmadezofzcesiumziodine,zwhichziszthenzconvertedztozelectricalzsignalzviazamorphouszsili
conzthinzfilmztransistors.zDirectzconversionzforzgoeszthezphosphorzportion.zAmorphouszseleniumzdetector
szconvertzradiationztozelectricalzsignals.
spongesz-zCORRECTzANSWER-radiolucentzpositioningzaid
immobilizationzdevicesz-zCORRECTzANSWER-
usedztozpreventzundesiredzmotionzduringzprocedureszandzdoesznotzrequirezazphysician'szorder.zThiszinclud
eszsandbags,zplexiglass,zandzcompressionzbands
ceilingzmountz-zCORRECTzANSWER-
alsozknownzaszoverheadztubezassembly.zMostzwidelyzusedzandzmostzversatile.zTwozrailszarezmountedztozt
hezceilingzwithztheztubezsuspendzandzallowszthezmostzflexibilityzforzcrossztablezexaminations
transversez-zCORRECTzANSWER-acrossztheztablezatzrightzanglesztozlongitudinal
,Longitudinalz-zCORRECTzANSWER-alongzthezaxiszofztheztable
verticlez-zCORRECTzANSWER-upzorzdown;zincreasingzorzdecreasingzthezdistancezbetweenztablezandztube
Anglezandztiltz-zCORRECTzANSWER-
allowsztheztubeztozanglezalongzthezlongzaxiszofztheztablezandzaimsztowardzthezwallzratherzthanztheztab
detentz-zCORRECTzANSWER-
mechanismztozstopzazmovingzpartzatzazspecificzlocation.zMostzoftenzusedztozalignztheztubezwithzthezbuckyz
andzreachzappropriatezSID.
primaryzx-rayzbeamz-zCORRECTzANSWER-X-
rayszformedzwithinzthezfocalzspotztargetzonzthezanodezwhichzdivergezinzazconezshape.zUsedztozformzthezra
diationzfield.zThezphotonzinzthezcenterzformszthezcentralzray.
whatzarezsomezpropertieszofzx-rayzbeam?z-zCORRECTzANSWER-
invisible,zelectricallyzneutral,znozmass,ztravelzatzspeedzofzlightzinzazvacuum,zcannotzbezopticallyzfocused,zp
olyenergentic/heterogenouszbeams,zproducezazrangezofzenergies,zcausezsomezsubstancesztozfluoresce,zca
usezchemicalzchanges
floatingz-zCORRECTzANSWER-tablezmovementzthatzallowsztheztableztozmovezindependently
Trendelenburgz-zCORRECTzANSWER-supinezpositionzinzwhichzthezpatientszheadziszlowerzthanzthezfeet
Under-tablezBuckyz(grid)z-zCORRECTzANSWER-
devicezplacedzbetweenzthezpatientzandzIRztozpreventzscatterzradiationzfromzreachingzthezIR.zUsuallyzunder
ztheztablezwithzmovingztrayztozhousezthezIR.zMadezofzthinzleadzstripszwithzradiolucentzinterspacezmaterial
timerz-zCORRECTzANSWER-
controlszthezlengthzofzthezexposure.zLongerzexposureszcausezmorezradiationztozthezpatient/IR
, mAz(milliamperage)z-zCORRECTzANSWER-
controlsztheznumberzofzphotons.zMeasurementzofzthezcurrentzflowzratezandzdeterminesztheznumberzofzel
ectronszinztheztube
kVpz(kilovoltagezpeak)z-zCORRECTzANSWER-
controlszthezspeedzofzelectronszandzenergyzofzphotonszcontrollingzthezqualityzofzphotonszandzthezimage.z
Measurezofzthezpotentialzdifferencezacrossztheztube
AECz(automaticzexposurezcontrol)z-zCORRECTzANSWER-
systemzusedztozprovidezconsistentzamountzofzradiationztozthezIRzterminatingzexposurezwhenzthezrightzam
ountzofzradiationziszreached.zRadiationztravelszthroughzthezpatientzthenzairzcellszpriorztozthezIR
remnantzradiationz(exitzradiation)z-zCORRECTzANSWER-
Bothztransmittedzandzscatterzradiationzthatzhasztraveledzthroughzthezpatientzandzattenuatedzpriorztozreac
hingzthezIR
scatterzradiationz-zCORRECTzANSWER-
incidentzphotonzinteractszwithzmatter,zlosseszenergyzwhenzejectingzanzelectronzwhichztravelszinzanotherzd
irection
shellszofzanzatomz-zCORRECTzANSWER-1-K,z2-L,z3-M,z4-N,z5-O,z6-P,z7-Q
atomicznumberz-zCORRECTzANSWER-topzrightznumberzonzthezelement
atomiczmassz-zCORRECTzANSWER-bottomzrightznumberzonzthezelement
atomszchargez-zCORRECTzANSWER-Positiveznucleuszwithznegativezcloudzaroundzit.zOverallzneutral
covalentzbondsz-zCORRECTzANSWER-sharezelectrons
ioniczbondsz-zCORRECTzANSWER-donatezelectrons
GRADED A+
collimatorz-zCORRECTzANSWER-beamzrestrictingzdevicezwithz2-3zsetszofzleadzshuttersztozlimitzthezx-
rayzbeamztozchangezthezfieldzsizezandzshape.zEquippedzwithzazlightztozdisplayzthezexposurezfield.
film-basedzcassettez-zCORRECTzANSWER-
imageziszcapturedzonzfilmztozbezprocessed.zThezcassettezcontainszthezfilmzandz1-
2zscreenszinzazprotectivezcase.zThezscreenszhaveztheirzownzprotectionzwithzthezphosphorzandzreflectivezla
yers.zThezfilmzgoeszunderzthezscreenzwithzthezemulsionzlayerzfacingzit.
CR-basedzcassettez-zCORRECTzANSWER-
houseszthezimagingzplatezwhichzactszthroughzphosphors.zThezIPzhaszprotectivezlayers,zbackingzwithzphosp
horszandzreflectivezlayerszbetweenzsimilarztozfilm.zThezphosphorziszazphotostimulablezphosphorzofzbarium
zfluoridezcrystalszwithzeuropium.
DR-basedzcassettez-zCORRECTzANSWER-
canzbezeitherzdirectzorzindirect.zIndirectzuseszazCCD,zwhichziszlightzsensitivezwithzazwidezdynamiczrange.zTh
ezphosphorzusedziszmadezofzcesiumziodine,zwhichziszthenzconvertedztozelectricalzsignalzviazamorphouszsili
conzthinzfilmztransistors.zDirectzconversionzforzgoeszthezphosphorzportion.zAmorphouszseleniumzdetector
szconvertzradiationztozelectricalzsignals.
spongesz-zCORRECTzANSWER-radiolucentzpositioningzaid
immobilizationzdevicesz-zCORRECTzANSWER-
usedztozpreventzundesiredzmotionzduringzprocedureszandzdoesznotzrequirezazphysician'szorder.zThiszinclud
eszsandbags,zplexiglass,zandzcompressionzbands
ceilingzmountz-zCORRECTzANSWER-
alsozknownzaszoverheadztubezassembly.zMostzwidelyzusedzandzmostzversatile.zTwozrailszarezmountedztozt
hezceilingzwithztheztubezsuspendzandzallowszthezmostzflexibilityzforzcrossztablezexaminations
transversez-zCORRECTzANSWER-acrossztheztablezatzrightzanglesztozlongitudinal
,Longitudinalz-zCORRECTzANSWER-alongzthezaxiszofztheztable
verticlez-zCORRECTzANSWER-upzorzdown;zincreasingzorzdecreasingzthezdistancezbetweenztablezandztube
Anglezandztiltz-zCORRECTzANSWER-
allowsztheztubeztozanglezalongzthezlongzaxiszofztheztablezandzaimsztowardzthezwallzratherzthanztheztab
detentz-zCORRECTzANSWER-
mechanismztozstopzazmovingzpartzatzazspecificzlocation.zMostzoftenzusedztozalignztheztubezwithzthezbuckyz
andzreachzappropriatezSID.
primaryzx-rayzbeamz-zCORRECTzANSWER-X-
rayszformedzwithinzthezfocalzspotztargetzonzthezanodezwhichzdivergezinzazconezshape.zUsedztozformzthezra
diationzfield.zThezphotonzinzthezcenterzformszthezcentralzray.
whatzarezsomezpropertieszofzx-rayzbeam?z-zCORRECTzANSWER-
invisible,zelectricallyzneutral,znozmass,ztravelzatzspeedzofzlightzinzazvacuum,zcannotzbezopticallyzfocused,zp
olyenergentic/heterogenouszbeams,zproducezazrangezofzenergies,zcausezsomezsubstancesztozfluoresce,zca
usezchemicalzchanges
floatingz-zCORRECTzANSWER-tablezmovementzthatzallowsztheztableztozmovezindependently
Trendelenburgz-zCORRECTzANSWER-supinezpositionzinzwhichzthezpatientszheadziszlowerzthanzthezfeet
Under-tablezBuckyz(grid)z-zCORRECTzANSWER-
devicezplacedzbetweenzthezpatientzandzIRztozpreventzscatterzradiationzfromzreachingzthezIR.zUsuallyzunder
ztheztablezwithzmovingztrayztozhousezthezIR.zMadezofzthinzleadzstripszwithzradiolucentzinterspacezmaterial
timerz-zCORRECTzANSWER-
controlszthezlengthzofzthezexposure.zLongerzexposureszcausezmorezradiationztozthezpatient/IR
, mAz(milliamperage)z-zCORRECTzANSWER-
controlsztheznumberzofzphotons.zMeasurementzofzthezcurrentzflowzratezandzdeterminesztheznumberzofzel
ectronszinztheztube
kVpz(kilovoltagezpeak)z-zCORRECTzANSWER-
controlszthezspeedzofzelectronszandzenergyzofzphotonszcontrollingzthezqualityzofzphotonszandzthezimage.z
Measurezofzthezpotentialzdifferencezacrossztheztube
AECz(automaticzexposurezcontrol)z-zCORRECTzANSWER-
systemzusedztozprovidezconsistentzamountzofzradiationztozthezIRzterminatingzexposurezwhenzthezrightzam
ountzofzradiationziszreached.zRadiationztravelszthroughzthezpatientzthenzairzcellszpriorztozthezIR
remnantzradiationz(exitzradiation)z-zCORRECTzANSWER-
Bothztransmittedzandzscatterzradiationzthatzhasztraveledzthroughzthezpatientzandzattenuatedzpriorztozreac
hingzthezIR
scatterzradiationz-zCORRECTzANSWER-
incidentzphotonzinteractszwithzmatter,zlosseszenergyzwhenzejectingzanzelectronzwhichztravelszinzanotherzd
irection
shellszofzanzatomz-zCORRECTzANSWER-1-K,z2-L,z3-M,z4-N,z5-O,z6-P,z7-Q
atomicznumberz-zCORRECTzANSWER-topzrightznumberzonzthezelement
atomiczmassz-zCORRECTzANSWER-bottomzrightznumberzonzthezelement
atomszchargez-zCORRECTzANSWER-Positiveznucleuszwithznegativezcloudzaroundzit.zOverallzneutral
covalentzbondsz-zCORRECTzANSWER-sharezelectrons
ioniczbondsz-zCORRECTzANSWER-donatezelectrons
