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