Fluoro
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| Formula for magnification | input diameter/output diameter
input # is always larger
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| How do you get brightness gain? | minification x flux.
it accelerates and focuses the electron beam on the II
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| Never use fluoro for? | positioning
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| Visually acuity is controlled by? | cones, phontonic
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| What lies between the input screen and the photocathode? | thin protective coating
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| Describe the function of the photocathode | absorbs light and emit e
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| what foes the output screen do? | Absorbs e and emit green light
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| Why is the input screen concave? | maintain same distance (input/output) and decrease vinetting?
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| What happens when greater voltage is applies to the electrostatic lens? | focal point moves closer to the input
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| What angles have the highest energy scatter? | greater than 90
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| What does photoemmissive material do? | absorb light and emit e
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| Name the most common viewing system? | video
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| what did rads become martyrs? | wore the beam on their head, lack rad protection
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| what causes fluoroscopic resolution to vary? | minification gain
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| Fluoro contrast is affected by what | scatter, penumbra light, light scatter in the II tube
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| define vinetting? | decrease in resolution and contrast at image periphery
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| Why is fluoro the domain of the rad? | because it's dynamic
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| What invention enabled brightness to be enhanced? | II
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| What does flux gain do to image quality? | decrease image
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| What is a CCD | charged coupling device, stores image
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| what is the min source to skin distance for mobile fluoro? | 12 inch
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| What is the min source to skin distance of stationary fluoro | 15
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| what is the dose to pt for cassettes | 30mR
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| what is the does for 105 mm film? | 10 mR
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| What is done to the output screen to produce high resolutions | thin screen and small phosphors
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| what is the diff from fluoro tube and dx tube? | SOD less than 15
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| After x-ray photons leave the pt, what does it strike next? | input screen
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| what is the purpose of electrostatic lens? | to accelerate and focus e
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| what is abc and how does it function | maintain brightness, change the flow of e between input and output
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| ?what is in the input screen | CsI sodium activated cesium iodide
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| 1 incident photon = how many light photons? | 1500
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| what is the Pb/eg for gloves and aprons in fluoro? | 0.25 mm
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| Name advantages a rad tech has over rad during fluoro? | not in the primary beam, and use rad as a shield
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| what reduced quantum mottle? | increase mA
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| define total brightness gain | minification x flux, measure the brightness intensity
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| Every year brightness gain deteriorates by? | 10%
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| Name the geometrical factor that alters recorded detail in fluoro? | mini gain, focal point, input screen, resolution, OID, size and phosphor thickness
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| what is the most common viewing system? | video/real time
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| Identify the rad tech responsibility during fluoro | assist rad, run post films (static)
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| Identify the steps in the process of an II tube | x-ray to light, light to e, e to green light
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| what does the math formula for minification gain | input diameter2/output diameter 2
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| Describe how the video raster scanning pattern affects video viewing? | decrease resolution
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| what are the advantages for CCD? | eliminate lag
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| identify the minimum over the table exposure rates and what is the advantage range | 10R/min
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| how do you reduce pt dose when using mag? | collimate the shutters
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