Imaging1. x-ray interactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| show | Reduction in the number of photon in the beam, and a subsequent loss of energy as the beam passes through matter.
-is the result of x-ray photons interacting with matter and losing energy from these interactions
🗑
|
||||
| In the diagnostic x-ray range, most commonly the interactions are with ? | show 🗑
|
||||
| show | higher
🗑
|
||||
| show | lowest energy, highest binding energy.
🗑
|
||||
| When a photon is absorbed, what happens to all of the energy of the photon? | show 🗑
|
||||
| show | Low
🗑
|
||||
| show | When an x-ray photon interacts with an inner-shell electron.
🗑
|
||||
| show | photoelectron
🗑
|
||||
| show | Ei= Eb+ Eke
Ei= energy of incident photon, Eb= binding energy of electron, Eke= kinetic energy of photoelectron
🗑
|
||||
| PE. unstable ionized atom fills the vacancy of its shell where the photoelectron was, the energy released from the electron transfer is in the form of a _______, known as _______. | show 🗑
|
||||
| Radiation created at the x-ray target is considered what kind of radiation? | show 🗑
|
||||
| show | Secondary radiation
🗑
|
||||
| What are the 3 basic rules that govern the possibility of a photoelectric interaction? | show 🗑
|
||||
| show | Incident x-ray photon energy must be greater than the binding energy of the inner-shell electron.
(30keV photon cannot remove K-shell e- that has a binding energy of 33keV..)
🗑
|
||||
| 2nd rule of a PE interaction? | show 🗑
|
||||
| show | decreases.
🗑
|
||||
| 3rd rule of a PE interaction? | show 🗑
|
||||
| show | increases.
(bone has a Z# higher than soft tissue, so PE interactions are more likely to occur in bone than soft tissue and that is why x-rays are great for demonstrating bones)
🗑
|
||||
| PE = Subject contrast | show 🗑
|
||||
| 10 keV or less results in what interaction | show 🗑
|
||||
| show | Classical or unmodified (because nothing changes.. leaves w/same energy as entering and no ionizing of atom)
🗑
|
||||
| Two types of coherent scatter? | show 🗑
|
||||
| Thomson scattering involves what? Rayleigh involves what? | show 🗑
|
||||
| How does coherent scatter produce scatter? | show 🗑
|
||||
| When does compton scatter occur? | show 🗑
|
||||
| show | compton or recoil electron
🗑
|
||||
| show | Compton scattered photon
🗑
|
||||
| show | posses less energy, lower frequency and longer wavelength (because part of the energy of the incident photon was used/lost to dislodge the e-)
🗑
|
||||
| Equation of Compton effect? | show 🗑
|
||||
| Compton. The amount of energy retained by the scattered photon (original incident photon) is dependent on what two things? | show 🗑
|
||||
| show | 0= no energy is transferred because the photon is proceeding in its original direction.
180= more energy is transferred to the recoil e- so less energy remains with the scattered photon
🗑
|
||||
| Unwanted exposures caused predominantly by scattered photons and less commonly by secondary photons, are called what? | show 🗑
|
||||
| In a pair production interaction the energy of the x-ray photon is…. | show 🗑
|
||||
| For a pair production interaction to occur, a very high photon with energy of at least _____ MeV is required. | show 🗑
|
||||
| show | Incident photon comes close to the nuclear field and loses all its energy, this energy is used to create the Negation and Positron.
🗑
|
||||
| show | Positron and electron combine, they disappear and give rise to two photons that move in opposite directions and each have energies of .51 MeV.
(matter is being converted back to energy)
🗑
|
||||
| Photodisintigration requires energy above approximately what? | show 🗑
|
||||
| what is Photodisinigration interaction? | show 🗑
|
||||
| In the diagnostic range, the majority of the x-ray beam is ______, and only a small percentage of photons exit to create the image. | show 🗑
|
||||
| As kVp increases, the total number of photons that are transmitted without interaction _____. | show 🗑
|
||||
| As kVp increases, the total number of photons that are transmitted without interaction increases. This means that the probability of photoelectric and compton interactions ________ with increasing kVp. | show 🗑
|
||||
| show | Decreases, increases.
( there is an increased % of scatter and a decreased % of absorption of the attenuated beam)
🗑
|
||||
| show | the REDUCTION in the total number of photons REMAINING IN the BEAM after passing through material.
(the thicker the body part, the greater the attenuation will be)
🗑
|
||||
| show | Compton scattering
🗑
|
||||
| In the human body diagnostic x--ray range, photoelectric interactions would predominate in what two circumstances? | show 🗑
|
||||
| show | high contrast. Because incident photons are absorbed and aren't added fog. PE increases patient dose.
🗑
|
||||
| show | High kVp and low mAs is less pt dose.
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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
Normal Size Small Size show me how
Created by:
Zoest35
Popular Radiology sets