Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chapter 13
SWGTC-R/T-Chapter 13-Wallace-Intensifying Screens
| Question | Answer |
|---|---|
| Two parts of an intensifying screen. | base and an active layer |
| What is the base of an intensifying screen made of? | piece of cardboard or plastic |
| Why does the base have a white reflective surface? | to direct light given off by the intensifying screen back to the film. |
| Layers of an intensifying screen | base, reflecting layer, active layer |
| what is the active layer of an intensifying screen made of? | microscopic crystals of a phospor suspended in a matrix |
| What do the phospors do? | give off light when struck by the x-ray photons |
| In areas where not a lot of radiation got through the patient, the light from the phospors will ______________________. | not be very bright. |
| areas that are exposed by only a little light will develop as a ____________. | light grey tone or white. |
| isotropically | in all directions |
| ability of a material to giveoff light when struck by x-rays. | flourescence |
| _______________ is a problem that can occur in older intensifying screens. | phosphorescence |
| phosphorescence | continued light emission after the x-rays have been turn off |
| phosphorescence causes _____________ density | increased |
| Fast screens emit __________ than slower screens. | more light |
| The density is greater in _________ screens. | fast |
| ___________ screens decrease patient dose, but also cause a decrease in ______________. | fast, recorded detail |
| Poor screen contact _____________ recorded detail. | reduces |
| Why is the wire mesh test performed? | to check for areas of poor screen contact |
| Two types of intensifying screens used today. | calcium tungstate and rare earth |
| this screen's phospors emit a blue-violet light hen struck by x-ray photons | calcium tungstate |
| This type of intensifying screen emits a yellow light when struck by x-ray photons. | rare earth |
| This type of intensifying screen is able to produce about the same amount of recorded detail as the other, but does so with a reduced radiation dose to the patient. | rare earth |
| True/False: It is not neccesary to change exposure factors when changing screen speeds. | False: exposure factors must be changed to prevent the film from being too light or too dark. |
Created by:
kristinalyn
Popular Radiology sets