| A | B |
|---|
| This interaction does not ionize the atom. | Coherent scattering |
| This interaction is the main source of patient dose. | Photoelectric absorption |
| This interaction is the main source of occupational exposure. | Compton scattering |
| This interaction produces backscatter | Compton scattering |
| This interaction produces secondary radiation | Photoelectric absorption |
| This interaction results when the photon interacts with an inner-shell electron | Photoelectric absorption |
| This interaction occurs below the usual energy range for diagnostic imaging | Coherent scattering |
| This interaction occurs when a photon interacts with an outer-shell electron | Compton scattering |
| When this interaction is more prevalent, the resulting radiograph will posess low contrast | Compton scattering |
| When this interaction is more prevalent, the resulting radiograph will posess high contrast | Photoelectric absorption |
| This interaction increases with increases in kVp | Compton scattering |
| How does filtration affect patient dose? | It removes low-energy photons that cannot penetrate the patient |
| Secondary radiation energy will be highest with _______ atomic numbers. | Higher |
| What is the most common filter material? | Aluminum |
| What is inherent filtration? | Filtration that is part of the tube and housing. |
| What is added filtration? | Any filtration that occurs outside the tube and housing and before the IR. |
| What filter is designed to solve a problem with unequal subject densities? | Compensating filter |
| WHat filter uses two or mor materials that complement one another in their absorbing abilities? | Compound filter |
| What type of filters are the wedge and trough? | COmpensating filters |
| What minimum total filtration is recommended for maching operting between 50 to 70 kVp? | 1.5 mm aluminum |
| What minimum total filtration is required for machines operating above 70 kVp? | 2.5 mm aluminum |
| What is half-value layer? | The amount of absorbing material that will reduce the intensity of the primary beam to one-half its original value. |
| What minimum half-value layer is required above 70 kVp? | 2.1 mm aluminum |
| What minimum half-value layer is required at 90 kVp0? | 2.5 mm aluminum |
| What must you do with your technical factors when filtration is increased? | They must be increased to maintain the same image receptor exposure. |
| _________ is the reduction of the number of x-rays as the beam passes through matter | Attenuation |
| The ______ the atomic number, the more energy will be required to remove a k-shell electron from the atom. | Higher |
| The further an electron is from the nucleus, the _______ the total energy of the electron will be. | Higher |
| Total electron energies increase when binding energy _________. | Decreases |
| Ei+Eb + Eke | Photoelectric absorption equation |
| What is secondary radiation? | A characteristic photon created by electron transfer from one shell to another but occurring outside the x-ray target. |
| Interaction where the incident photon needs an energy which is slightly greater than the binding energy of the elctron for the interaction to occur. | Photoelectric absorption |
| In this interaction, the incident photon is total absorbed in the interaction | Photoelectric absorption |
| What is a photoelectron? | An electron ejected during the photoelectric interaction |
| In this interaction, the atom is not ionized. | C0herent scattering |
| Ei = Es + Eb + Eke | Equation for Compton scattering |
| What is a recoil electron? | A dislodged outer-shell electron from the Compton interaction |
| True or false, Most photons will scatter in a more forward direction, especially when the incident photon energy increases. | True |
| What is radiation fog? | The result of scattered photons striking the radiographic film and placing a density on the film that is unrelated to the patient's anatomy. |
| True or false, a photoelecton is also called a recoil electron. | False |
| As kVp increases, the total number of photons which are transmitted without interaction _________. | Increases |
| As kVp increases, the % of photoelectric interactions ________. | Decreases |
| As kVp increases, the % of Compton interactions ________. | Increases |
| What 2 interaction between x-ray and matter have a significant impact on the x-ray image? | Photoelectric absorption and Compton scattering |
| In the human body, which interaction is the predominant interaction through most of the diagnostic range? | Compton scattering |
| In the human body, in what 2 circumstances do photoelectric interaction predominate? | In lower-kVp ranges (25 to 45) and when high atomic number elements are introduced. |
