Fluoroscopy exam questions with correct
answers
Total filtration permanently required in the useful fluoroscopic beam should not be
less than Answer ✓✓ 2.5mm Aluminum
If X-ray source is below the table, useful beam exposure must be measured at what
distance above the table top Answer ✓✓ 30 cm
Table top exposure rates for units without auto exposure control must be measured every Answer✓✓ 3 years
Dark adaptation for the eye takes how long Answer ✓✓ 30 minutes
Target-to-tabletop distance must be greater than and should be greater than... Answer✓✓ 12 and 18 inches
Integration time for brain to recognize an object Answer ✓✓ 0.2 seconds
Most scatter occurs at which direction from the primary beam Answer ✓✓ 135 degrees
mA setting for spot filming where a spot film camera is not used Answer ✓✓ 150 mA
Greatest dose to the patient comes from spot filming cameras using this film size Answer✓✓ 105 mm SI unit analogous to the rad is Answer ✓✓ Gray
_________ is a variation in density resulting from the random spatial distribution of quanta. Answer ✓✓ Quantum sink
SI unit analogous to the rem Answer ✓✓ Sievert (unit)
Exposure reduction of .25 mm lead Answer ✓✓ 97%
Scattered radiation received is proportional to Answer ✓✓ Dose received by the patient
Most effective medium for static viewing in terms of reducing patient dose Answer✓✓ Video disc recorder
Contrast of the image intensifying tube is measured by Answer ✓✓ conversion factor
maximum magnification for cinefluorography is done via which method Answer✓✓ total over framing
Ratio of photons that leave the output phosphor to the number of Xray photons that
strike the input phosphor Answer ✓✓ Flux gain
Half value layer determines which characteristic of the Xray Answer ✓✓ Xray quality Ability to distinguish separate objects in line pairs per mm Answer ✓✓ Resolving power
The portion of the image intensifier responsible for magnification Answer ✓✓ electrostatic lenses
resolution of a 9 inch image intensifier tube Answer ✓✓ 3.5 line pairs per millimeter
light photons intercepting when electrons strike a fluorescent screen forms a... Answer✓✓ Real image
Fluoro with a grid in place affects exposure rates how Answer ✓✓ 1.5-2 x higher
Greatest radiosensitivity of fetus occurs when Answer ✓✓ 2-8 weeks gestation
The quantity of the beam is controlled by which unit of measurement Answer ✓✓ miliamperage
Which fluoroscopic method gives patient dose reduction of up to to 95%? Answer✓✓ video disc recorder
100erg/gram is equivalent to? Answer ✓✓ 1 rad
Fluoro units with AECs or CINE cameras must have physicist calibration how often Answer✓✓ every year
answers
Total filtration permanently required in the useful fluoroscopic beam should not be
less than Answer ✓✓ 2.5mm Aluminum
If X-ray source is below the table, useful beam exposure must be measured at what
distance above the table top Answer ✓✓ 30 cm
Table top exposure rates for units without auto exposure control must be measured every Answer✓✓ 3 years
Dark adaptation for the eye takes how long Answer ✓✓ 30 minutes
Target-to-tabletop distance must be greater than and should be greater than... Answer✓✓ 12 and 18 inches
Integration time for brain to recognize an object Answer ✓✓ 0.2 seconds
Most scatter occurs at which direction from the primary beam Answer ✓✓ 135 degrees
mA setting for spot filming where a spot film camera is not used Answer ✓✓ 150 mA
Greatest dose to the patient comes from spot filming cameras using this film size Answer✓✓ 105 mm SI unit analogous to the rad is Answer ✓✓ Gray
_________ is a variation in density resulting from the random spatial distribution of quanta. Answer ✓✓ Quantum sink
SI unit analogous to the rem Answer ✓✓ Sievert (unit)
Exposure reduction of .25 mm lead Answer ✓✓ 97%
Scattered radiation received is proportional to Answer ✓✓ Dose received by the patient
Most effective medium for static viewing in terms of reducing patient dose Answer✓✓ Video disc recorder
Contrast of the image intensifying tube is measured by Answer ✓✓ conversion factor
maximum magnification for cinefluorography is done via which method Answer✓✓ total over framing
Ratio of photons that leave the output phosphor to the number of Xray photons that
strike the input phosphor Answer ✓✓ Flux gain
Half value layer determines which characteristic of the Xray Answer ✓✓ Xray quality Ability to distinguish separate objects in line pairs per mm Answer ✓✓ Resolving power
The portion of the image intensifier responsible for magnification Answer ✓✓ electrostatic lenses
resolution of a 9 inch image intensifier tube Answer ✓✓ 3.5 line pairs per millimeter
light photons intercepting when electrons strike a fluorescent screen forms a... Answer✓✓ Real image
Fluoro with a grid in place affects exposure rates how Answer ✓✓ 1.5-2 x higher
Greatest radiosensitivity of fetus occurs when Answer ✓✓ 2-8 weeks gestation
The quantity of the beam is controlled by which unit of measurement Answer ✓✓ miliamperage
Which fluoroscopic method gives patient dose reduction of up to to 95%? Answer✓✓ video disc recorder
100erg/gram is equivalent to? Answer ✓✓ 1 rad
Fluoro units with AECs or CINE cameras must have physicist calibration how often Answer✓✓ every year
