Physics U6 &HW
Help!
|
|
||||
|---|---|---|---|---|---|
| show | bremsstrahlung
🗑
|
||||
| show | 5 keV
🗑
|
||||
| Which of the following interactions contributes to image noise? | show 🗑
|
||||
| Which of the following occurs in a Compton interaction? | show 🗑
|
||||
| show | E(i) = E(s)+ E(b)+ E(KE)
🗑
|
||||
| If Ei= incident x-ray energy, E(s)=scattered x-ray energy, E(b) =electron binding energy, and E(KE)= secondary electron kinetic energy, then which of the following is true? | show 🗑
|
||||
| During Compton effect, most of the incident x-ray energy is given to which of the following? | show 🗑
|
||||
| show | longer wavelength
🗑
|
||||
| show | Noise(fog)
🗑
|
||||
| The probability that an x-ray will interact with an outer shell electron is influence principally by | show 🗑
|
||||
| The compton effect is | show 🗑
|
||||
| show | image noise(fog)
🗑
|
||||
| If 45keV x-ray interacts with the K-shell electron in an atom of molybdenum(E(b)=20keV) and ejects it with 8keV energy what will be the enrgy of the scattered x-ray? | show 🗑
|
||||
| The probability that an x-ray will undergo Compton interaction decreases with | show 🗑
|
||||
| show | they have very low binding energy
🗑
|
||||
| Which of the following is the x-ray interaction that does NOT cause ionization? | show 🗑
|
||||
| show | lower energy than an incident x-ray
🗑
|
||||
| If Ei= incident x-ray energy, E(s)=scattered x-ray energy, E(b) =electron binding energy, and E(KE)= photoelectric kinetic energy, then which of the following is true? | show 🗑
|
||||
| show | E(KE)=E(i)-E(b)
🗑
|
||||
| The photoelectric effect is principally associated with which of the following | show 🗑
|
||||
| show | .021024576
🗑
|
||||
| show | fat
🗑
|
||||
| show | 0.3keV
🗑
|
||||
| during photoelectric interaction | show 🗑
|
||||
| show | 30keV x-ray and bone
🗑
|
||||
| show | photoelectric interaction
🗑
|
||||
| the probability of photoelectric effect varies as the function of x-ray energy(E)? | show 🗑
|
||||
| show | an electron leaves the atom
🗑
|
||||
| the photoelectric effect is | show 🗑
|
||||
| Lead has a K-shell electron binding energy of 88keV therefore an | show 🗑
|
||||
| show | the photoelectron will have 2 keV energy
🗑
|
||||
| show | Z(3)
🗑
|
||||
| Anatomic structures that readily transmit rays are called | show 🗑
|
||||
| differential absorption, although a complicated process, is basically the result of differences between | show 🗑
|
||||
| when a radiograph is taken | show 🗑
|
||||
| At what approximate x-ray energy is the probavility of a photoelectric interaction in soft tissue equal to the probability of compton interaction | show 🗑
|
||||
| show | bone
🗑
|
||||
| show | subject atomic number
🗑
|
||||
| show | there are differences in effective atomic number && in mass density
🗑
|
||||
| To optimize x-ray mammography | show 🗑
|
||||
| Differential absorption between bone and soft tissue occurs principally for which of the following reasons | show 🗑
|
||||
| Angiography with iodinated compounds | show 🗑
|
||||
| Differential absorption is | show 🗑
|
||||
| As kVp increases the relative number of x-rays | show 🗑
|
||||
| In which of the following tissue does differential absorption most depend on differences in mass density | show 🗑
|
||||
| show | it is proportional
🗑
|
||||
| show | tissue mass density
🗑
|
||||
| Differential absorption between lung and soft tissue occurs principally because of which of the following | show 🗑
|
||||
| The reduction in intensity of an x-ray beam after it passes through tissue is called | show 🗑
|
||||
| x-ray transmission decreases exponentially, which also means that | show 🗑
|
||||
| Which process contributes most to the radiographic image | show 🗑
|
||||
| High kVp in chest radiograph will | show 🗑
|
||||
| Increasing kVp in imaging will | show 🗑
|
||||
| In high kVp chest radiography contrast depends most upon | show 🗑
|
||||
| Microcalcifications are imaged on mammograms principally because of | show 🗑
|
||||
| More contrast is present froma barium examination than from an iodine examination because | show 🗑
|
||||
| Photoelectric effect is proprtional to | show 🗑
|
||||
| what will increase the energy of bremsstrahlung radiation | show 🗑
|
||||
| Compton interaction occur with outer shell electrons and result in | show 🗑
|
||||
| show | compton scattering
🗑
|
||||
| show | the energy(kVp)& nature of the radiation photon; the atomic number(Z) of the subastance being irradiated
🗑
|
||||
| show | their origin is different x-ray comes from the shells and gamma comes from the nucleus; Their therapeutic effects are identical
🗑
|
||||
| show | secondary electrons
🗑
|
||||
| show | the energy absorbed from the liberation of the secondary electrons and their spatial distribution
🗑
|
||||
| show | secondary electrons
🗑
|
||||
| Name two different types of secondary electrons | show 🗑
|
||||
| Only what contributes to biologic effects | show 🗑
|
||||
| What are the 4 types of diagnostically significant interactions | show 🗑
|
||||
| show | pair production and photodiscentigration
🗑
|
||||
| What interaction cause the blackness(density) on the film | show 🗑
|
||||
| what are the two key factors that the interactions depend on? | show 🗑
|
||||
| show | empty space
🗑
|
||||
| show | 10(-12) or one-million-millionth
🗑
|
||||
| A number of photons in any given x-ray beam passes directly through the atom without encountering an electron is called what type of interaction | show 🗑
|
||||
| The bringing about of less orderly arrangement of photon's direction due to the deflection caused by charged particles(orbital electrons) interposed in the path of the beam is known as | show 🗑
|
||||
| Charged particles is also called | show 🗑
|
||||
| What is another name for unmodified scattering? | show 🗑
|
||||
| What are the two types of scattering | show 🗑
|
||||
| Unmodified scattering refers to the scattering of radiation by what | show 🗑
|
||||
| show | near an electron;sets the electron oscillating w/the same freq. of the incident electromagnetic waves;disappears in the electron;the electron then forces the radiation out & stops ocillating; photon is traveling in a differ direct but has the same energy
🗑
|
||||
| What is the new photon or scattered photon called and why | show 🗑
|
||||
| show | transfer; the direction of the Incident photon)(now called scattered)
🗑
|
||||
| When does classical scatter occur | show 🗑
|
||||
| Does unmodified scattering have practical use in the Diagnostic Radiology | show 🗑
|
||||
| Photoelectric interaction with true absorption creates | show 🗑
|
||||
| Where does photoelectric absorption take place aand how much energy does it have | show 🗑
|
||||
| show | equal or exceed the binding energy of the electron
🗑
|
||||
| show | to the dislodged electron
🗑
|
||||
| show | photoelectron
🗑
|
||||
| what is the process called when the electron is given kinetic energy | show 🗑
|
||||
| show | photoelectric interaction with true absorption
🗑
|
||||
| show | E(i)= E(b) + E(ke)
🗑
|
||||
| During the Photoelectric Interaction, the secondary radiation occurs when the atom _______ the now vacant hole left by the dislodged __________. | show 🗑
|
||||
| show | Radiation is created when the hole is filled and is characteristic of the shell that is now filled
🗑
|
||||
| show | The inner-shell (K) binding energy - the binding energy of the shell the electron was pulled from (usually L)
🗑
|
||||
| show | Weak and not of diagnostic importance
🗑
|
||||
| The probability of occurrence for Photoelectric Interaction with True Absorption is dependent upon what 2 things? | show 🗑
|
||||
| The probability of occurrence for Photoelectric Interaction is ______________ proportional to the _______ of kVp. | show 🗑
|
||||
| show | Directly Proportional; Cube of Z (Zᶾ)
(Atomic #)
🗑
|
||||
| show | decreases;increases;decreases;decreases;decreases
🗑
|
||||
| As the Atomic # of the irradiated substance increases the probability of occurrence for the Photoelectric Interaction ___________. | show 🗑
|
||||
| show | Probability = Zᶾ/kVpᶾ
🗑
|
||||
| show | Up to 50 kVp numbers
🗑
|
||||
| Photoelectric Interaction w/ True Absorption usually occurs with atoms of ________ atomic numbers. | show 🗑
|
||||
| show | The Density of the substances
🗑
|
||||
| The greater the density of a substance being irradiated means the ___________ the probability of Photoelectric Interaction. | show 🗑
|
||||
| show | Compton Effect
🗑
|
||||
| show | Loosely bound outer-shell electron
🗑
|
||||
| The Compton Effect occurs at photon energies up to _______ kVp. | show 🗑
|
||||
| show | Recoil or (AKA) Compton Electron
🗑
|
||||
| show | Angle
🗑
|
||||
| show | Some is used dislodging the electron and the remainder is divided between the recoil
🗑
|
||||
| show | More; Recoil
🗑
|
||||
| During Modified Scattering, the less direct the hit of the photon on the electron, the _________ energy will remain with the _________ photon. | show 🗑
|
||||
| During the Compton Effect, how is the scattered photon different from the incident photon? | show 🗑
|
||||
| show | E(i)= E(s) + E(b) + E(ke)
🗑
|
||||
| Give the subscripts for the Compton Effect formula: 1)i, 2)s, 3)b, 4)ke | show 🗑
|
||||
| This is radiation that is scattered 180° from the direction of travel of the incident photon: | show 🗑
|
||||
| show | fog; gray
🗑
|
||||
| show | 1)Up to 50 kVp 2)Up to 100 kVp 3)Below 10 keV
🗑
|
||||
| What interactions occur with INNERSHELL electrons? | show 🗑
|
||||
| What interactions occur with OUTERSHELL electrons? | show 🗑
|
||||
| Which interaction is responsible for Fog? | show 🗑
|
||||
| What interaction does not involve an electron? | show 🗑
|
||||
| Which interactions eject orbital electrons? | show 🗑
|
||||
| show | Backscatter from Modified Scattering
🗑
|
||||
| Which interaction increases the scale of contrast and actually "degrades" contrast? | show 🗑
|
||||
| What devices are available to reduce the negative effects of Compton Scattering? | show 🗑
|
||||
| Increasing the hardness (quality) of the beam and Increasing kVp will have what effect on the probability of Compton Scattering? | show 🗑
|
||||
| show | Decreases; Increases
🗑
|
||||
| show | The scattered photons produced from the interaction will be strong enough to (1) continue traveling in a straight line to the film & (2) are stronger when they reach the film
🗑
|
||||
| show | Because the number of interactions will decrease as the photon's energy increases (it will not interact with an electron and go straight through the patient to the film)
🗑
|
||||
| What are some cassettes designed with to prevent backscatter | show 🗑
|
||||
| show | At least 1.02 MeV
🗑
|
||||
| show | The Nucleus
🗑
|
||||
| During Pair Production, a photon disappears into a ___________ of an atom and ejects 1 _____________ electron and 1 ____________ electron. | show 🗑
|
||||
| What is the name of and what becomes of the ejected negative electron during Pair Production? | show 🗑
|
||||
| show | Slows by interacting with other atoms and combines with an electron
🗑
|
||||
| Why would a Positron combine with an electron from another atom? | show 🗑
|
||||
| show | Positronium
🗑
|
||||
| A Positronium is an _________ atom which is very ___________. The subatomic particles that created to form a Positronium _____________ eachother. | show 🗑
|
||||
| When the Positronium explodes it creates _______ Photons of ___________ energies | show 🗑
|
||||
| show | 0.51 MeV Each; Travel in opposite directions
🗑
|
||||
| During Pair Production the first conversion is from energy to ______. The Second conversion is from ____________ to __________. | show 🗑
|
||||
| The reaction that causes the Positronium to produce 2 photons is called the _____________ Reaction. | show 🗑
|
||||
| Pair Production occurs with photon energies from _________ to __________. | show 🗑
|
||||
| What is differential absorption? | show 🗑
|
||||
| Differential Absorption increases as kVp is | show 🗑
|
||||
| show | radiopaque
🗑
|
||||
| Allows radiation to pass through and appears black | show 🗑
|
||||
| show | mass density
🗑
|
||||
| if mass density is doubled then what happens to the photoelectric interaction | show 🗑
|
||||
| show | exponential attenuation
🗑
|
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:
atesta0824
Popular Physics sets