FREE RADIOLOGY AND STUDY GAMES ABOUT SCREENS

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FREE RADIOLOGY AND STUDY GAMES ABOUT SCREENS

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -47 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: what size crysatls give more speed

Answer:

large

Question 2: phosphorescence

Answer:

emits light for short period after stimulation has ended

Question 3: what is spectral matching

Answer:

matching the color light given off by the screen to film that is sensitive to that color Question 4: what will happen if you use a high speed screen with a technique for a slow speed screen

Answer:

you will over expose the film(therefore you would underexpose film if you used a low speed screen with a high speed technique)

Question 5: what is the test used to detect poor film-screen contact

Answer:

wire mesh test

Question 6: what does poor film-screen contact look like on a film

Answer:

blurry spot

Question 7: what is the purpose fo the protective coat

Answer:

-protects from abrasions,stains,and scratches(white line artifact) -provides cleaning surface

Question 8: what is the disadvantage of a fast speed screen

Answer:

less spatial resolution

Question 9: how are screens constructed

Answer:

-base layer -reflective layer -phosphor/active layer -protectcive coat

Question 10: what is the modular transfer function to measure resolution

Answer:

measures information lost between subject an IR caused by light diffusion

Question 11: what is the purpose of intensifying screens

Answer:

converts small quantity of xrays to larger quantity of light photons

Question 12: clumping of crystal in film causes what

Answer:

film graininess

Question 13: what can cause poor film-screen contact

Answer:

-worn felt -broken hinges or latches -foreign matter -warped cassettes -bent frame -trapped air(transitory-comes and goes) Question 14: what is the primary difference between the imaging plate cassette and film cassette

Answer:

blocker Question 15: if you only cared about image quality or resolution what film/screen combo would you use

Answer:

slow/slow

Question 16: what is intensification factor

Answer:

exposure with a screen vs. exposure w/o a screen

Question 17: what is spatial resolution in film screens dependant upon

Answer:

-phosphor crystal size -phosphor layer thickness -phosphor concentration -type of phosphor -reflective layer -yellow light absorbing dye

Question 18: what is the test for resolution

Answer:

line pair test(line pair bar phantom)

Question 19: high DQE allows us to do what

Answer:

lower our mas

Question 20: what does excessive heat do to the speed of your screen

Answer:

slows it down

Question 21: functions to provide mechanical support for phosphor

Answer:

base layer

Question 22: photostimuable

Answer:

gives of luminescence twice

Question 23: what are the advantages of intensifying screens

Answer:

-less pt dose -less wear and tear on the euipment Question 24: -redirects isotropically emitted light to film -uses 2x light, so it decreases pt dose, but loses spatial resoltin -detail screens use yellowish/brown light absorbing dye to absorb spread of long wavelength light which improves spatial resolution

Answer:

reflective layer

Question 25: as screen speed increases, does it give off more or less light

Answer:

more Question 26: when rare earth phosphors are combined with additional elements what color do they give off

Answer:

blue violet Question 27: if you wanted a good balance between dose and resolution what are your film/screen options

Answer:

-fast/slow -medium/medium