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

X-ray Emission

Kathy Class Test 3

QuestionAnswer
thickness of absorbing material necessary to reduce the x-ray intensity to half of its orignal value Half-value layer
increase beam quality by removing low energy x-rays from the beam Filtration
X-ray tube port and dielectric oil. 0.5mm Al equiv. Inherent filtration
sheet of aluminum and collimator mirror Added filtration
2 factors that contribute to x-ray beam quality kVp and Filtration
The process of eliminating undesirable low-energy x-ray photons by the insertion of absorbing materials into the primary beam X-ray Beam Filtration
The Purpose of X-ray Beam Filtration To absorb the long wavelength (low Energy) photons as they leave the x-ray tube and before theycan reach the patient
Total filtration is the combination of Inherent and Added filtering X-ray beam filters
Speacial type of filter used when the body part being examined changes in thickness or density from one are to another Compensating Filters
how is scatter radiation produced? Scatter radiation is primarily produced when x-ray interacts with an outer shell electron, loses energy, and is diverted in a different direction during a Compton Interaction.
What is the relationship of kVp to incidence of x-ray interaction? The type of interaction between x-ray and matter is determined by the energy of the incident x-ray. Since kVp controls the average energy of the x-ray beam, it will also determine the incidence of a particular interaction.
How does kVp affect the number of photoelectric versus Compton interaction? At low kVp, there are more incidents of photoelectric interactions (since these are more predominant at lower energies). At higher kVp‘s, PE interactions are reduced and there is a higher incidence of Compton interactions.
How does scatter radiation affect image contrast? Scatter radiation adversely decreases image contrast by adding fog or grayness to the image.
What is the predominant interaction in the diagnostic x-ray range? The photoelectric effect (PE) is the primary interaction due to its effect on the imaging process and patient dose considerations
Explain the process of coherent scattering? Coherent scatter results when very low energy x-ray produces a vibration in the atom with which it interacts. When the vibration stops, a new x-ray photon emerges with the same energy as the incident x-ray, but diverted in a different direction.
Discuss the role of coherent scattering in diagnostic imaging? Coherent scatter accounts for less than 5% of the scatter radiation produced.
Attenuation The reduction in the number of x-ray photons in the beam as it passes through matter
List 5 interactions that can occur when x-ray interacts with matter Coherent Scattering, Compton Scattering, Photoelectric Effect, Pair production, and photodisintegration
X-rays that are absorbed and/ or scattered are said to have been? Attenuated
As x-rays intersct with matter, they will either? Pass through unaltered(gray on IR), Be totally absorbed(white on IR),Be partially absorbed,lose energy and change direction(scattered)(this will degrade image)
What causes the reduction in the number of x-rays? the 5 interaction proceses.(they result in ABSORPTION or SCATTERING of the x-ray photons) (specific interaction dependent on ENERGY OF THE X-RAY)Kiloelectron volt=keV
Coherent Scattering(aka classical, unmodified) low energy x-ray(~10 to 20 keV) interacts with atom. causes EXCITATION(vibration) of atom at SAME FREQUENCY as x-ray. when vibration stops, a scattered x-ray given off at SAME ENERGY only CHANGED in DIRECTION. accounts for<5% of scatter in diagnostic xray
Created by: CifalaD
 

 



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