Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

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.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
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

Imaging Ch.6

Scatter Control

How is scatter radiation most easily controlled? Collimation and grids
What is not a way to reduce the production of scatter radiation? Increasing grid ratio
What influences the amount of scatter radiation striking the IR but not the production of scatter radiation? Increasing the grid ratio
What is the best beam limiting decivce for limiting unsharpness surrounding the radiographic image? Variable aperture collimator
What purpose does positive beam limitation serve? To reduce pt exposure to limiting the exposure field to the same size as the image recepor in the bucky tray
What occurs when scatter radiation strikes the film? Radiographic contrast decreases
The height of the lead strips relative to the distance b/t the lead strips is the measure of the Grid ratio
T/F A grid decreases scatter production F
T/F A high ratio grid removes little scatter F
If the height of the lead strip DECREASES and the spcae between the grid strips INCREASES the grid will be MORE effective at removing scatter radiation T/F F
T/F If the height of the lead strips INCREASES and the space between the grid strips DECREASES the grid will be MORE effective at scatter removal T
The # of lead strips per inch in a grid is a meause of the grid frequency
What would be the most difficult grid to use Cross hatched grid
A radiograph that has a goffed appearance has most likley been exposed to what? Scatter radiation
Which beam restriction device can be cut to the size needed? An aperture diaphragm
What is the result of imaging a thicker part or patient? More compton interactions
As grid ratio ____ the removal of scatter ____ Increases, increases
The amount of MAS required with a grid divided by the amount of mas needed w/o a grid is the calucation that determines the Grid conversion factor and bucky factor
Which grid design is manufactured to match the divergence of the xray beam? The focused grid
What occurs when the xray beam is not properly aligned with the grid strips? grid cut off
In genergal, when should a grid be used When part thickness exceeds 10cm
When a grid is needed but not available what may be used for certain exams? Air grap technique
What type of grid error is seen as acceptable density in the middle of the film and with decreasing density bilaterally as you move away from the center? upside down focused grid
What type of grid error is seen as a loss of density at the periphery of the image? off focus
why does the air gap technique work? the scatter photons are more likley to miss the IR
The results of the collimator alignment QC test should demonstrate that the alignment is withing 5% of the SID used T/F False
Also called lateral decentering the ___ grid error results when the CR is not aligned to the middle of a focused grid off center
Changing from an 8:1 grid to a 12:1 grid along with making the appropriate adjustments, will result in: Decreased Pt dose and an image with a shorter scale of contrast
Created by: rachelbeatty4
Popular Physics sets




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:
restart all cards