fluoroscopy Test Questions with 100% Correct
Answers
Who invented fluoroscopy and when?
Thomas Edison in 1896
The cones are in charge of what type of vision?
Photopic/ day vision
Rods are in charge of?
Scotopic/ night vision
Where is the x-ray tube located?
Under the table
Diagnostic tube factors are?
20-1000mA range (15")
Fluoroscopic tube factors are?
0.5- 5.0 mA (12")
Why and when did the image intensification tube come about?
1948; 500-8000 times more bright to use cone vision
Visual acuity is controlled by and why is it important?
Cone vision used. Easier to see images with less radiation exposure
What is the input screen made of?
, Cesium iodide
What is the output screen made of?
Zinc cadium
Magnification tubes-what happens to the focal point, how it is determined, and what affect
it has on the patient and image quality?
Closer the focal spot to input= increased magnification
Smaller the input screen= increased magnification
Mag. mode= increased pt dose& increased resolution
What is total brightness gain and formula?
Brightness gain= minification X flux gain
Is a measurement of the increase in image intensity achieved by image intensification tube.
What is minification gain?
Occurs as a result of the same # of electrons that were produced at a large input screen being
compressed to small output screen
What does flux gain determine?
Measure of the increase in light photons due to conversion efficiency of output screen
Automatic Brightness control function and other names known?
ADC: Automatic Dose Control
ABS: Automatic Brightness Stabilization
like AEC
Answers
Who invented fluoroscopy and when?
Thomas Edison in 1896
The cones are in charge of what type of vision?
Photopic/ day vision
Rods are in charge of?
Scotopic/ night vision
Where is the x-ray tube located?
Under the table
Diagnostic tube factors are?
20-1000mA range (15")
Fluoroscopic tube factors are?
0.5- 5.0 mA (12")
Why and when did the image intensification tube come about?
1948; 500-8000 times more bright to use cone vision
Visual acuity is controlled by and why is it important?
Cone vision used. Easier to see images with less radiation exposure
What is the input screen made of?
, Cesium iodide
What is the output screen made of?
Zinc cadium
Magnification tubes-what happens to the focal point, how it is determined, and what affect
it has on the patient and image quality?
Closer the focal spot to input= increased magnification
Smaller the input screen= increased magnification
Mag. mode= increased pt dose& increased resolution
What is total brightness gain and formula?
Brightness gain= minification X flux gain
Is a measurement of the increase in image intensity achieved by image intensification tube.
What is minification gain?
Occurs as a result of the same # of electrons that were produced at a large input screen being
compressed to small output screen
What does flux gain determine?
Measure of the increase in light photons due to conversion efficiency of output screen
Automatic Brightness control function and other names known?
ADC: Automatic Dose Control
ABS: Automatic Brightness Stabilization
like AEC
