Fluoroscopy Exam Test Bank Questions with 100% Correct Answers
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Course
Fluoroscopy
Institution
Fluoroscopy
Fluoroscopy Exam Test Bank Questions with 100% Correct Answers
What activates the production of x-rays during fluoro? - Answer- Dead man switch (foot switch); NOT THE "FOOT PEDAL"!
How many light photons are emitted for each absorbed x-ray photon? - Answer- 5000 light photons.
What percen...
Fluoroscopy Exam Test
Bank Questions with 100%
Correct Answers
What activates the production of x-rays during fluoro? - Answer- Dead man switch (foot
switch); NOT THE "FOOT PEDAL"!
How many light photons are emitted for each absorbed x-ray photon? - Answer- 5000
light photons.
What percentage of light from an image intesifier's output screen is transmitted to the
cine camera when in use? - Answer- 85 - 95%.
Which type of timer accuracy test is performed for three phase x-ray units? - Answer-
Synchronous spinning top test which shows a solid arc exposure in portion of a circle
and measured in degrees.
What components are placed within a filament circuit in an x-ray tube? - Answer- Step-
down transformer which provides low voltage to heat up the filament(s) for thermionic
emission and rheostat to control the amount of mA to emit.
What is the 2-dimensional picture element in x-ray? - Answer- Pixel.
What is the 3-dimentional picture element in x-ray? - Answer- Voxel.
How much flux gain does a typical image intensifier have? - Answer- 50
What is used to synchronize x-ray exposure with proper film position/alignment? -
Answer- Grid controlled x-ray tubes.
What are the 2 principle components of a fluoroscope? - Answer- Tube and fluorescent
screen.
Why is patient dose much higher in fluoroscopic than radiographic procedures? -
Answer- Shortened SOD; entrance exposure is significantly greater than exit exposure
as a result of attenuation processes within the patient.
, State some radiation safety features of fluoroscopic equipment. - Answer- Bucky slot
cover, 5 minute timer, tabletop exposure, lead curtain, max of 10R per minute, deadman
switch, minimum of 12" SID, and max of 5 mA.
What are 3 variables that affect fluoroscopic patient dose? - Answer- 1.) Exposure rate,
2.) tissue thickness or density, and 3.) length of exposure.
What do phosphors emit - Answer- light photons after interacting with x-rays
Complex electronic device that receives the image-forming x-ray beam and converts it
into a visible-light image of high intensity - Answer- Image-Intensifier Tube
Electron emission that follows light stimulation - Answer- Photoemission
Electron emission that follows heat stimulation - Answer- Thermionic Emission
Usually located underneath and inside the table. - Answer- Fluoroscopy X-ray Tube
the anode of a Image-Intensifier tube is Positively charged and is normally supplied with
about how much k.V. - Answer- 25 kv
Brightness gain formula - Answer- Minification gain times Flux gain
The misrepresentation of object size and shape on a radiograph - Answer- Distortion
Caused by the repulsion of electrons from one another, and the primary beam diverging
from the focal spot. - Answer- Vignetting or pincushion distortion
Increased noise has an inverse relationship to - Answer- contrast
What is the function of an "image intensifier"? - Answer- It is designed to electronically
amplify the brightness of an image.
Which structures in the human eye are responsible for the sensation of vision? -
Answer- Rods and cones. Rods = night vision (scotopic); colorblind. Cones = daylight
vision (photopic); can perceive color.
When an x-ray interacts with the input phosphor, its energy is converted into what? -
Answer- Visible light.
What component of the image intensifier emits electrons when illuminated by the input
phosphor? - Answer- The photocathode.
What 3 things does magnification mode result in? - Answer- 1.) Better contrast
resolution, 2.) better spatial resolution, and 3.) higher pt dose.
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