Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
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

img crit ch 30

image critique - recorded detail and spatial resolution

QuestionAnswer
What is the unit for screen film resolution? line pairs per mm
How is resolution determined with line pairs for screen film? more line pairs means better resolution
Term for recorded detail in digital imaging? spatial resolution
What determines spatial resolution? matrix size, pixel size, gray scale, bit depth
What is the Z-axis? gray scale, represents depth to the information in the image (bit depth)
X and Y grid matrix make up the spatial resolution because they represent points in space
High frequency is what kind of wavelength? short wavelength
Define gray scale as relating to spatial resolution the number of shades of gray that can be displayed by each pixel
High spatial resolution correlates with _____ object size? small
High spatial resolution correlates with _____ OID? small (close)
High spatial resolution correlates with _____ unit of measure? high Lp/mm
High spatial resolution correlates with _____ MTF? high
High spatial resolution correlates with _____ PSF? low
Low spatial resolution correlates with _____ object size? large
Low spatial resolution correlates with _____ OID? large (distant)
Low spatial resolution correlates with _____ unit of measure? low Lp/mm
Low spatial resolution correlates with _____ MTF? low
Low spatial resolution correlates with _____ PSF? high
Nyquest criterion samples the spatial resolution 2X per cycle and averages incoming data to insure no info is missed, overlapped or doubled.
Aliasing incoming data is samples less than 2X per cycle, images have more pattern
What factors affect recorded detail? FSS, OID, SID, IR, CR imaging plates, size of detector, image processing system, motion
Increasing the SID affects recorded detail how? increases
Decreasing OID affects recorded detail how? increases
Increasing patient thickness affects recorded detail how? decreases
Decreasing FSS affects recorded detail how? increases
Created by: annaluz87