,CHAPTER 1:INTRODUCTION TO RADIOLOGIC SCIENCE b9 b 9 b9 b 9
1. Whichofthe followingbest describes the primary purpose ofdiagnostic rad i
b9 jl jl b9 b9 b9 b9 b9
ography?
A. Totreatdiseasesusingionizing radiation
jl jl jl b 9
B. Toproduceimagesofinternal structuresfordiagnosis b9 b9 jl
C. Tomonitorpatient vitalsigns jl
D. Tosterilize medicalequipment
jl b9
Answer:B
Rationale:Diagnosticradiography’smain purposeis toproduceimages ofinternal bod jl b9 b9 jl b 9 b9 b9
ystructures,allowing physicians todetectand diagnoseabnormalities. Options A, C,a
jl b9 b9 jl jl b9 b 9 b9 b9 b9
ndDare unrelated todiagnostic imaging.
b9 b9 b9 b 9 b9 b9
2. Whatisthe primary sourceofionizing radiationinmedicalimaging?
jl b9 b9 jl b9 jl
A. MRIscanner
B. X-raytube
C. Ultrasound transducer jl
D. PETscanner
Answer:B Ratio b9
nale:TheX-
ray tubegenerates ionizing radiation usedin diagnosticradiography.MRIandultra
b9 b 9 b 9 b 9 b9 b9 jl jl
sound usenon- jl jl
ionizing energy,while PETusesradioactivetracersratherthan producingradiation inatube
b9 b9 b9 b9 b9 b9 b9 jl b9
.
3. HowdoestheALARA principle guideradiologicpractice? jl jl jl b9 jl
A. Maximizing imagequality regardlessofdose b9 b9
B. Minimizing radiationexposurewhile achieving diagnosticquality b9 b9 b9
C. Limiting patient interaction to reduceinfection b9 jl b9 jl jl
D. Increasingexposuretime forbetterpenetration jl b9
Answer:B
Rationale:ALARA (“As LowAs ReasonablyAchievable”) ensurespatient andstaf fre jl jl jl b9 b 9 b9 jl b9 b9
ceivetheminimum radiation dosenecessaryfordiagnostic-quality images. b9 b9 jl b9
,4. A radiologictechnologistis preparing to imagea patientwith asuspected fra c
b9 b9 jl b9 b9 b9 b9 b9
ture. Which safety measure is most important?
b9 b9 b9 b9 b9 b9
A. Usingthefastestimaging speedjl jl jl b9
B. Ensuringproperpatient shieldingandpositioning jl b9
C. Increasingexposuretoreducerepeat images jl b9 jl
D. Allowing thepatienttomoveduringimaging b9 jl b9
Answer:B
Rationale:Propershieldingandpositioning minimize unnecessaryexposureandprote ct ra b9 b9 b9 jl b9 b9 jl
diosensitive tissues.OptionsA,C,andDcanincreaseradiation riskordegradeim age qualit
b 9 b9 b9 b9 b9 b9 b9 b 9 b9 b9 b9 b9 jl
y.
5. Scenario:A45-year-
old patient expresses concernaboutradiation exposure.Howshouldthetechnolog ist respo
b 9 jl jl jl b9 b9 b9 b9 jl
nd?
A. Ignoretheirconcerns;radiation is safe
jl b9 b9
B. Explain thatdoseisminimized andbenefits outweigh risks
b9 jl b9 b 9 jl b9 b9
C. Refusetoperformthe exam b9 jl b9
D. Increaseexposuretoensurebetter images jl jl b9
Answer:B
Rationale:Patientsshouldbeinformed aboutthelow doseandthediagnosticbenefits b9 jl b9 b9 jl b9 b9
,reducinganxiety andpromotinginformedconsent.
b9 b9 b9 b9 b9 b9
6. Which professionalorganizationestablishes standards for radiologic te
b9 jl b9 b9 b9 b9 b9
chnologists?
A. WHO
B. ASRT
C. FDA
D. CDC
Answer:B
Rationale: The American Society of Radiologic Technologists (ASRT) sets education a
b9 b9 b9 b9 b9 b9 b9 b9 b9 b9
l andprofessionalstandards.FDA regulates equipment, CDC focusesoninfection contr o
b9 jl b9 b9 b9 b 9 b9
l, WHO onglobal health.
b9 b9 b9
, 7. Whichimagingmodalitydoesnot useionizing radiation?
jl b9 b9
A. CTscan
B. MRI
C. X-ray
D. Fluoroscopy
Answer:B
Rationale:MRIusesmagnetic fields andradiowaves,which arenon-ionizing.CT,X-
jl jl b9 b9 jl b9 jl b9 jl
ray, andfluoroscopyall useionizing radiation.
b9 b9 b9 b 9
8. Whatisthe mostradiosensitivetissueinthehuman body?
jl b9 jl b9
A. Muscle
B. Skin
C. Bonemarrow
D. Cartilage
Answer:C
Rationale:Bonemarrowcontainsrapidlydividing cells,making it highly sensitivetoio nizi
jl jl b9 b9 jl b9 b9 b9
ng radiation. Muscle, skin, andcartilage are less sensitive.
b 9 b9 b9 b9 b9 jl
9. Whichfactorprimarilyaffectsthe quality ofanX-ray image?
jl b9 jl b9 jl b9
A. Patient diet jl
B. Tubevoltageand current b9
C. Roomtemperature jl
D. Technologist height jl
Answer:B
Rationale:Tubevoltage(kVp)andcurrent(mA) controlX- jl b9 b9 b9 b9
rayenergyandphotonquantity, directly affecting image quality.
b9 b 9 b9 jl b 9
10. Howoftenshouldradiologicequipment betestedforquality assurance?
jl jl jl 9b b9
A. Daily
B. Monthly
C. Annually
D. Onlywhenmalfunction occurs b9
1. Whichofthe followingbest describes the primary purpose ofdiagnostic rad i
b9 jl jl b9 b9 b9 b9 b9
ography?
A. Totreatdiseasesusingionizing radiation
jl jl jl b 9
B. Toproduceimagesofinternal structuresfordiagnosis b9 b9 jl
C. Tomonitorpatient vitalsigns jl
D. Tosterilize medicalequipment
jl b9
Answer:B
Rationale:Diagnosticradiography’smain purposeis toproduceimages ofinternal bod jl b9 b9 jl b 9 b9 b9
ystructures,allowing physicians todetectand diagnoseabnormalities. Options A, C,a
jl b9 b9 jl jl b9 b 9 b9 b9 b9
ndDare unrelated todiagnostic imaging.
b9 b9 b9 b 9 b9 b9
2. Whatisthe primary sourceofionizing radiationinmedicalimaging?
jl b9 b9 jl b9 jl
A. MRIscanner
B. X-raytube
C. Ultrasound transducer jl
D. PETscanner
Answer:B Ratio b9
nale:TheX-
ray tubegenerates ionizing radiation usedin diagnosticradiography.MRIandultra
b9 b 9 b 9 b 9 b9 b9 jl jl
sound usenon- jl jl
ionizing energy,while PETusesradioactivetracersratherthan producingradiation inatube
b9 b9 b9 b9 b9 b9 b9 jl b9
.
3. HowdoestheALARA principle guideradiologicpractice? jl jl jl b9 jl
A. Maximizing imagequality regardlessofdose b9 b9
B. Minimizing radiationexposurewhile achieving diagnosticquality b9 b9 b9
C. Limiting patient interaction to reduceinfection b9 jl b9 jl jl
D. Increasingexposuretime forbetterpenetration jl b9
Answer:B
Rationale:ALARA (“As LowAs ReasonablyAchievable”) ensurespatient andstaf fre jl jl jl b9 b 9 b9 jl b9 b9
ceivetheminimum radiation dosenecessaryfordiagnostic-quality images. b9 b9 jl b9
,4. A radiologictechnologistis preparing to imagea patientwith asuspected fra c
b9 b9 jl b9 b9 b9 b9 b9
ture. Which safety measure is most important?
b9 b9 b9 b9 b9 b9
A. Usingthefastestimaging speedjl jl jl b9
B. Ensuringproperpatient shieldingandpositioning jl b9
C. Increasingexposuretoreducerepeat images jl b9 jl
D. Allowing thepatienttomoveduringimaging b9 jl b9
Answer:B
Rationale:Propershieldingandpositioning minimize unnecessaryexposureandprote ct ra b9 b9 b9 jl b9 b9 jl
diosensitive tissues.OptionsA,C,andDcanincreaseradiation riskordegradeim age qualit
b 9 b9 b9 b9 b9 b9 b9 b 9 b9 b9 b9 b9 jl
y.
5. Scenario:A45-year-
old patient expresses concernaboutradiation exposure.Howshouldthetechnolog ist respo
b 9 jl jl jl b9 b9 b9 b9 jl
nd?
A. Ignoretheirconcerns;radiation is safe
jl b9 b9
B. Explain thatdoseisminimized andbenefits outweigh risks
b9 jl b9 b 9 jl b9 b9
C. Refusetoperformthe exam b9 jl b9
D. Increaseexposuretoensurebetter images jl jl b9
Answer:B
Rationale:Patientsshouldbeinformed aboutthelow doseandthediagnosticbenefits b9 jl b9 b9 jl b9 b9
,reducinganxiety andpromotinginformedconsent.
b9 b9 b9 b9 b9 b9
6. Which professionalorganizationestablishes standards for radiologic te
b9 jl b9 b9 b9 b9 b9
chnologists?
A. WHO
B. ASRT
C. FDA
D. CDC
Answer:B
Rationale: The American Society of Radiologic Technologists (ASRT) sets education a
b9 b9 b9 b9 b9 b9 b9 b9 b9 b9
l andprofessionalstandards.FDA regulates equipment, CDC focusesoninfection contr o
b9 jl b9 b9 b9 b 9 b9
l, WHO onglobal health.
b9 b9 b9
, 7. Whichimagingmodalitydoesnot useionizing radiation?
jl b9 b9
A. CTscan
B. MRI
C. X-ray
D. Fluoroscopy
Answer:B
Rationale:MRIusesmagnetic fields andradiowaves,which arenon-ionizing.CT,X-
jl jl b9 b9 jl b9 jl b9 jl
ray, andfluoroscopyall useionizing radiation.
b9 b9 b9 b 9
8. Whatisthe mostradiosensitivetissueinthehuman body?
jl b9 jl b9
A. Muscle
B. Skin
C. Bonemarrow
D. Cartilage
Answer:C
Rationale:Bonemarrowcontainsrapidlydividing cells,making it highly sensitivetoio nizi
jl jl b9 b9 jl b9 b9 b9
ng radiation. Muscle, skin, andcartilage are less sensitive.
b 9 b9 b9 b9 b9 jl
9. Whichfactorprimarilyaffectsthe quality ofanX-ray image?
jl b9 jl b9 jl b9
A. Patient diet jl
B. Tubevoltageand current b9
C. Roomtemperature jl
D. Technologist height jl
Answer:B
Rationale:Tubevoltage(kVp)andcurrent(mA) controlX- jl b9 b9 b9 b9
rayenergyandphotonquantity, directly affecting image quality.
b9 b 9 b9 jl b 9
10. Howoftenshouldradiologicequipment betestedforquality assurance?
jl jl jl 9b b9
A. Daily
B. Monthly
C. Annually
D. Onlywhenmalfunction occurs b9
