Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Digital Radiography.

Bushong ch 26

QuestionAnswer
DR is More efficient in 3 time, space and personnel than screen-film radiography
CR uses photostimulable phosphor
SPR uses photodiode (not used)
Indirect DR uses 2 TFT and charge couple devices
Direct DR uses TFT
The 3 c's in IDing DR Systems Capture element Coupling element Collection element
In CR, image is captured where Photostimulable phosphor
In DR, image is captured where, 3 Cesium iodide (CsI) Gadolinium oxysulfide (GdOS) Amorphous selenium (a-Se)
Coupling element does what and with what3 Couples x-ray signal to the collector Lens Fiber optic assembly Contact layer a-Se
Collection element collects electrons
3 things that collect electrons Photodiode, CCD, TFT
Photodiode and CCD is a light sensative device
TFT does what charge sensative device collects electrons
Advantages of CCD 3 Sensativity, Dynamic Range, Size
Sensativity 2 Can detect and respond to very low levels of light Ideal for low patient dose
Dynamic range Responds to a wide range of light
Size Very small and highly adaptable to DR Measures approx. 1-2cm and the pixel size is 100 x 100µm
CCD/CsI 2 Used in indirect DR Converts x-rays to light then to electric signals
CsI works how 2 Scintillation light from the CsI phosphor is efficiently transmitted through fiber optic bundles to the CCD array Results in high x-ray capture efficiency and good spatial resolultion – up to 5 lp/mm
What kind of element is used in indirect DR Cesium Iodide/Amorphous Silicon Collection
Cesium Iodide/Amorphous Silicon Collection Element Captures x-ray and transmits the collected light to element (CsI a-Se) CsI a-Se is a liquid that is painted onto a support surface
Low pt dose b/c of High photoelectric capture
Fill factor Due to the other components on the face of the pixel, the fill factor is approx. 80%
As a result of the small pixel size spatial resolution is increased but patient dose is increased
Whats Similar to CeI a-Si Gadolinium Oxysulfide Collection Element
Unlike screen film.... increasing the amount (thickness) of Gd OS increases the speed of the system but without a loss of spatial resolution.
Whats used for direct DR Amorphous Selenium; No scintillation phosphor
The imaging forming x-ray beam interacts directly w/ the a-Se, producing a charged pair
The a-Se is 2 both the capture and coupling elements
The IR for a direct dr is an active matrix array of TFT
Created by: rachelbeatty4
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards