Types of interactions and Photoelectric Effect Compton and Thompson Effects Thompson Effect and other interactions Types of Radiation and Subject Contrast Subject contrast cont.

100

Photoelectric effect, Compton effect, and Thompson effect
What are the three main types of x-ray interactions that occur within the patient?

100

Modified scattering and incoherent scatters
What are two other names for the Compton Effect?

100

1%
The Thompson effect is responsible for what percentage of scatter?

100

Any radiation resulting from interactions within the body
Define secondary radiation

100

Increase in scatter, longer gray scale, less blacks and whites
If you increase tissue thickness, tissue density, and/or tissue atomic number, what will happen?

200

The photoelectric effect produces the contrast on the images
What is the photoelectric effect responsible for?

200

99%
The Compton Effect is responsible for what percentage of the scatter?

200

70 kVp and above
At what kVp does the Thompson effect occur at?

200

Radiation emitted in the direction of the primary beam
Define remnant radiation

200

decreased contrast long gray scale shorter wavelength greater penetration
What happens to contrast, gray scale, wavelength, and penetration when kVp is increased?

300

All blacks and whites
The photoelectric effect is responsible for what colors on the image?

300

70 kVp and above
What kVp does the Compton Effect occur at?

300

The photon has less energy than the electron it interacts with, hence increasing the energy of the electron, which is released as a scatter photon
Describe the Thompson effect

300

Radiation emitted in a direction that differs from its' original direction
Define scatter radiation

300

Compton Effect is increased and Photoelectric effect is decreased
What effect does increasing the x-ray beam energy (kvp) have on the proportion of Compton scatter interactions compared to photoelectric interactions?

400

<70 kVp
What must the kVp be for photoelectric effect to occur?

400

Produces a recoil electron and a Compton photon when the incoming photon has more energy than the electron in an outer shell
Describe the Compton Effect

400

Can produce characteristic interactions similar to that which occurs in the anode
What is a vague description of the other interactions?

400

Absorption
What has the greatest influence over "overall contrast"

400

Decreases
What effect does increasing the x-ray beam energy (kVp) have on the total number of all interactions within the patient?

500

When the photon is absorbed by an inner-shell electron, which then increases it's energy to the point the electron is ejected out as a photoelectron. The photoelectron then collides with another atom and never leaves the body.
Describe the photoelectric effect

500

unmodified scattering, coherent scattering, and classical scattering.
What are 3 other names for the Thompson effect?

500

Pair production and photodisinegration
What are two examples of other interactions?

500

Tissue thickness, tissue density, tissue atomic number
What are the three factors in subject contrast?

500

Compton
A photon with much more energy than the electron binding energies of the tissue through which it passes is most likely to undergo what type of interaction?

Principles Ch. 4

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