3
Radiography 141 with Cook at Tidewater Community College
About this deck
By: tyler wilson
Created: 2011-07-31
Size: 32 flashcards
Views: 2
Created: 2011-07-31
Size: 32 flashcards
Views: 2
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1. SIZE of phosphor crystals
2. THICKNESS of phosphor layer
3. TYPE of phosphor
4. Spectral matching
Name the 4 factors that affect the speed of intensifying screens.
spectral matching
What's the term for matching color emission spectrum of screen with proper film color?
screen emission spectrum with film color
Name the 2 factors that are involved with spectral matching.
LARGE crystals
THICKER layer
Give the appropriate SIZE of crystals & phosphor layer THICKNESS seen in Fast Speed Screens.
SMALL crystals
THINNER layer
What SIZE crystals & phosphor layer THICKNESS is typical in Slow Speed Screens?
FAST Speed Screen = less detail
______ Speed Screen creates less recorded detail & spatial resolution.
SLOW Speed Screen = more detail
What Speed Screen produces more detail & spatial resolution?
Quantum Mottle/Image Noise
Name the disadvantage seen in Fast Speed Screens.
increased Pt. dose
What's the disadvantage seen with Slow Speed Screens?
Slow Speed Screen
To reduce quantum mottle/spatial resolution, What speed screen would you choose?
less mAs = LESS Pt. radiation
With Fast Speed Screens, what level of mAs is required to produce density? Which leads to?
Slow Speed Screens
_________ Speed Screens require more mAs to produce proper density.
Slow Speed
Which Film Speed gives the Pt. more radiation?
1/2 or 50% LESS
A 200 Speed Screen would require _______ mAs than a 100 speed.
2x or 100% MORE
A 100 Speed Screen would require _______ mAs than a 200 speed.
FAST speed screens & LOW mAs
<also causes NOISE & STATIC>
Quantum Mottle is mainly due to _______ Speed Screens & ________.
recorded detail & spatial resolution
How does Quantum Mottle effect an image?
SLOW
Which Speed Screen improves Quantum Mottle, Noise & Static?
increase mAs
What should be done to mAs to resolve image noise/quantum mottle?
INCREASE # of xray photons to reduce image noise
How does increasing mAs reduce image noise/Quantum Mottle?
film
Which imaging method does speed determine proper exposure to I.R. to achieve density?
quantum mottle
What's the term for random, uneven distribution of photons across the screens surface?
speed
In film, _____ determines proper exposure to I.R. for optimal density.
DENSITY; by determine correct exposure
What does speed ultimately affect in the image? How?
Digital
Name the imaging method which receptor exposures (mAs & kV) determine Speed Class at which the system operates.
speed the system operates
In Digital Systems, what does mAs & kV determine?
FAST speed class = LESS mAs
Which digital speed class requires less exposure to CR plate? What mAs set to?
SLOW speed class = MORE mAs
Which digital speed class requires more exposure to CR plate? What mAs set to?
increase exposure to plate
What do exposure indicator values indictate?
Fuji system
_________ System has a higher than normal sensitivity (S) #.
kodak
________ System has a higher exposure index (EI)
Agfa/LgM
_________ System has a log value higher than 2.2.
About this deck
By: tyler wilson
Created: 2011-07-31
Size: 32 flashcards
Views: 2
Created: 2011-07-31
Size: 32 flashcards
Views: 2
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
Kathy