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

Ch 16 RAD 170

Patient as a Beam Emitter

QuestionAnswer
_______ is the reduction in the total number of x-ray photons remaining in the beam after passing through a given thickness of material. Attenuation
X-rays are attenuated ________. exponentially
Higher atomic number materials attenuate a _____ percentage of the beam. higher/greater
What specifically causes a beam to be attenuated? the number of electrons (few or many)
_____ is the quantity of matter per unit of volume measured in KILOGRAMS per cubic meter. Density
The _____ is the radiographer's greatest variable. patient
At an atomic level, the body consist primarily of: hydrogen, carbon, nitrogen and oxygen
What are the atomic numbers of the substances that make up body? hydrogen(1), carbon(6), nitrogen(7), and oxygen(8)
Calcium found in concentrated amounts in bone has an atomic number of ___. 20
Four major substances account for variable attenuation: air, fat muscle and bone
Air has a higher atomic number than fat and muscle but less density and as a result, will absorb ____ photons. less
________ refers to the impact the subject has on the resultant radiographic density. Subject density
______ is the degree of differential absorption resulting from the differing absorption characteristics of the tissues in the body. Subject contrast
One of the primary factors that affects the sharpness or detail of an image is the ____. SID
Greater sharpness will result when the anatomical part is ____ to the IR. closer
_____ is the misrepresentation of the size or shape of the structure of interest. Distortion
Size distortion in the form of ______ occurs because various anatomical structures sit in the body at varying levels. magnification