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RADT 334 PROJECT
Interactions W/ Matter
| Question | Answer |
|---|---|
| List the 5 interactions of matter? | Coherent Scatter, Compton Scatter, Photoelectric, Pair Production, and Photodisintegration |
| This interaction has energies below 10 keV? | Coherent Scatter |
| Classical is another name for which interaction? | Coherent Scatter |
| What are the other names for Coherent Scatter? | Thompson, Rayleigh, and Classical |
| No ionization occurs during this interaction? | Coherent |
| Has little importance to diagnostic radiology? | Coherent Scatter |
| Incident x-ray interacts with outer shell electrons? | Compton Scatter |
| Ionization occurs during this interaction? | Compton Scatter |
| What is it called when an electron gets ejected from the atom? | Compton Electron |
| True/False: Compton scatter reduces image contrast? | False |
| This interaction can happen in any direction or any x-ray. | Compton Scatter |
| True/False: As mass density of the absorbed increases, Compton scatter will increase? | True |
| Compton Scatter causes what on an image? | Fog/Scatter |
| Which interactions occur in the diagnostic energy range? | Compton Scatter and Photoelectric Effect |
| This interaction is responsible for occupational exposure? | Compton Scatter |
| Lead aprons are a _____ barrier? | Secondary |
| Ionizing interactions with inner shell electrons? | Photoelectric Effect |
| Which interaction is TOTALLY absorbed? | Photolectric |
| True/False: The photoelectric effect will occur when the incident x-ray has energy lower than the electron binding energy. | False |
| More likely to occur with high Z- atoms? | Photoelectric Effect |
| During Compton Scatter, a full 180 degrees of it's rotation is ___ of it's energy? | 2/3 |
| Does NOT depend on an atomic number? | Compton Scatter |
| True/False: Compton scatter will increase as x-ray energy increases? | False |
| Which shells will the photoelectric effect most likely occur in? | K,L,M |
| This interaction is responsible for patient exposure? | Photoelectric Effect |
| Characteristic radiation occurs as a result of which interaction? | Photoelectric Effect |
| X-ray energy escapes interactions with electrons and comes close enough to the nucleus of the atom to be influenced by a strong nuclear field? | Pair Production |
| Two electrons appear: 1 being positive and the other being negative. Which interaction does this occur in? | Pair Production |
| This interaction is most likely to occur when photons are binded tightly together? | Pair Production |
| MeV stands for? | Mega Electron Volts |
| This interaction must have an incident photon that is atleast 1.02 MeV? | Pair Production |
| True/False: X-rays with less than 1.02 MeV cannot undergo pair production. | True |
| When a positron unites with a free electron it is called? | Annihilation Radiation |
| These interactions occur outside of the diagnostic energy range? | Pair Production and Photodisintegration |
| High energy photon is absorbed by the nucleus? | Photodisintegration |
| This interaction must have an energy level above 10 MeV? | Photodisintegration |
| Photodisintegration could emit two kinds of particles? What are those particles? | Alpha and beta particles |
| During this process, the nucleus throws off a piece of itself? | Photodisintegration |
| This interaction is used in PET scans and Radiation Therapy? | Pair Production |
| Photodisintegration is used in which modalities? | Only- radiation therapy |
| This interaction causes noise to images? | Compton Scatter |
| This interaction provides diagnostic information to the image receptor? | Photoelectric Effect |
| Only ___% of x-rays reach the image receptor? | 1% |
| Only ___% of the image results from x-rays emitted from the tube? | 5% |
| Which two interactions occur with energy levels between 20-150? | Compton Scatter and Photoelectric Effect |
| This interaction is responsible for bones to appear white on a film? | Photoelectric Effect |
| What is one way to get rid of Compton scatter? | A grid |
| What is the formula for the Theory of Relativity? | E-mc^2 |
| If you increase your kVp, you do what to patient dose? | Increase |
| This interaction can have any angle? | Compton Scatter |
| Three factors that affect differential absorption? | Higher atomic number, increased kVp, and increased mass density |
| As the atomic number increases, what happens to absorption? | Increases |
| Refers to how tightly the atom is compacted together? | Mass Density |
| The electron being removed from the atom is called? | Photoelectron |
| Bone has a higher number of _____ _____, which gives it the white appearance? | Mass Density |
| What is created during Pair Production? | Antimatter |
| Reduction in the radiation intensity that results from absorption and scattering? | Attenuation |
| Different degrees of absorption in different tissues that result in image contrast and reformation of the x-ray image? | Differential Absorption |
| How can you make a tissue or object has a higher atomic number? | Add contrast |
| If you have a high atomic number, it ______ photoelectric absorption? | Increases |
| If you have a high kVp, it _____ photoelectric absorption? | Decreases |
| If you have a high mass density, it ______ photoelectric absorption? | Increases |
| If you have a high atomic number, how does that affect Compton Scatter? | Unaffected |
| If you have a high kVp, it will ______ Compton Scatter? | Decrease |
| If you have a high mass density, it will ______ Compton Scatter? | Increase |
| A high atomic number will ______ transmitted x-rays? | Decrease |
| A high kVp will _____ transmitted x-rays? | Increase |
| A high mass density will ______ transmitted x-rays? | Decrease |
Created by:
bspayne