Fluoroscopy Exam Questions With Complete Solutions
_________ is a variation in density resulting from the random
spatial distribution of quanta. Correct Answers Quantum sink
100erg/gram is equivalent to? Correct Answers 1 rad
A disadvantage of thermoluminescent dosimeters Correct
Answers No permanent record is provided
A material placed in the useful primary X-ray beam to absorb
preferentially the less penetrating radiations Correct Answers
Filter
Ability to distinguish separate objects in line pairs per mm
Correct Answers Resolving power
As spot film size increases, what happens to the patient dose?
Correct Answers Patient dose increases
At what stage of image intensified fluoroscopy is the number of
image forming photons lowest? Correct Answers Entering the
input phosphor
Brightness gain formula Correct Answers Minification gain
times Flux gain
Brightness ratio of the periphery to the center of the output
screen is termed: Correct Answers Contrast
,Caused by the repulsion of electrons from one another, and the
primary beam diverging from the focal spot. Correct Answers
Vignetting or pincushion distortion
CINE framing due to poor optical coupling Correct Answers
Underframing
Compared to the input phosphor, the image output phosphor is...
Correct Answers Smaller and brighter
Complex electronic device that receives the image-forming x-
ray beam and converts it into a visible-light image of high
intensity Correct Answers Image-Intensifier Tube
Contrast of the image intensifying tube is measured by Correct
Answers conversion factor
Conversion factor is calculated how Correct Answers Light
intensity at the output phosphor divided by the dose rate
Converts light image from the output phosphor to an electrical
signal that is sent to the tv monitor, where it can be
reconstructed as an image on the tv screen. Correct Answers
T.V. camera tube
cycles per time unit in a TV camera is known as... Correct
Answers bandwidth
Dark adaptation for the eye takes how long Correct Answers 30
minutes
, Device made up of different density filters Correct Answers
step-wedge
Doesn't occur during x-ray imaging. Needs 1.02 MeV to occur.
Affects nuclear electric field. X-ray disappears. 2 electrons
appear: a positively charged positron and a negatively charged
negatron. Correct Answers pair production.
Doesn't occur in diagnostic radiology. Needs 10 MeV to occur.
Nucleon is emitted from nucleus. Correct Answers
photodisintegration.
Dose effect curve that radiation protection guides are based on...
Correct Answers linear nonthreshold curve
Due to the phosphor aging, which should be measured
periodically to check the contrast Correct Answers conversion
During a fluoroscopic examination, what are static images
obtained on? Correct Answers Spot Film
Electron emission that follows heat stimulation Correct Answers
Thermionic Emission
Electron emission that follows light stimulation Correct
Answers Photoemission
Electronic intensification occurs when... Correct Answers
Electrons are moved at high speed from photocathode to output
phosphor
_________ is a variation in density resulting from the random
spatial distribution of quanta. Correct Answers Quantum sink
100erg/gram is equivalent to? Correct Answers 1 rad
A disadvantage of thermoluminescent dosimeters Correct
Answers No permanent record is provided
A material placed in the useful primary X-ray beam to absorb
preferentially the less penetrating radiations Correct Answers
Filter
Ability to distinguish separate objects in line pairs per mm
Correct Answers Resolving power
As spot film size increases, what happens to the patient dose?
Correct Answers Patient dose increases
At what stage of image intensified fluoroscopy is the number of
image forming photons lowest? Correct Answers Entering the
input phosphor
Brightness gain formula Correct Answers Minification gain
times Flux gain
Brightness ratio of the periphery to the center of the output
screen is termed: Correct Answers Contrast
,Caused by the repulsion of electrons from one another, and the
primary beam diverging from the focal spot. Correct Answers
Vignetting or pincushion distortion
CINE framing due to poor optical coupling Correct Answers
Underframing
Compared to the input phosphor, the image output phosphor is...
Correct Answers Smaller and brighter
Complex electronic device that receives the image-forming x-
ray beam and converts it into a visible-light image of high
intensity Correct Answers Image-Intensifier Tube
Contrast of the image intensifying tube is measured by Correct
Answers conversion factor
Conversion factor is calculated how Correct Answers Light
intensity at the output phosphor divided by the dose rate
Converts light image from the output phosphor to an electrical
signal that is sent to the tv monitor, where it can be
reconstructed as an image on the tv screen. Correct Answers
T.V. camera tube
cycles per time unit in a TV camera is known as... Correct
Answers bandwidth
Dark adaptation for the eye takes how long Correct Answers 30
minutes
, Device made up of different density filters Correct Answers
step-wedge
Doesn't occur during x-ray imaging. Needs 1.02 MeV to occur.
Affects nuclear electric field. X-ray disappears. 2 electrons
appear: a positively charged positron and a negatively charged
negatron. Correct Answers pair production.
Doesn't occur in diagnostic radiology. Needs 10 MeV to occur.
Nucleon is emitted from nucleus. Correct Answers
photodisintegration.
Dose effect curve that radiation protection guides are based on...
Correct Answers linear nonthreshold curve
Due to the phosphor aging, which should be measured
periodically to check the contrast Correct Answers conversion
During a fluoroscopic examination, what are static images
obtained on? Correct Answers Spot Film
Electron emission that follows heat stimulation Correct Answers
Thermionic Emission
Electron emission that follows light stimulation Correct
Answers Photoemission
Electronic intensification occurs when... Correct Answers
Electrons are moved at high speed from photocathode to output
phosphor
