1110 2 Word Scramble
|
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
| Question | Answer |
| When filtration is increased, what must happen to the technical factors to maintain the same density | They must be increased |
| The half-value layer is typically expressed in | |
| What is the most common filter material used | tungsten |
| Patient’s absorb x-ray photons | primary |
| Problems of unequal subject density can be solved by using | filters |
| The thickest portion of the wedge filter is placed over | cathode |
| Define total filtration | Inherent plus added |
| Collimation devices are considered part of the filtration | added |
| Most of the inherent filtration of a typical x-ray equipment comes from the | tube |
| How does filtration affect patient dose | decreases |
| By inserting absorbing materials into the primary beam (filtration),undesirable is eliminated | Low energy |
| Can filtration remove a portion of the useful beam | yes |
| Filtration outside of the tube and housing is considered to be | added |
| Filtration is typically added between the and | tube and pt |
| Describe inherent filtration | Anything in the tube, makes up 1.5 |
| What is a compound filter | 2 or more materials added together. Highest atomic # closest to the tube and the lowest closest to the pt |
| Even when filtration is increased, the percentage of attenuated photons | |
| as photon energy ___ | Decreased |
| Half-value layer affects patient | dose |
| Define a half-value layer | Amount of filtration needed to reduce the beam ½ original value |
| Inherent filtration of a mammographic unit is than that of a regular diagnostic unit | Less |
| As the tube ages, the anode begins to pit and the glass envelope may gain a mild coating of vaporized metal. This causes a in inherent filtration | increased |
| What does filtration permit the radiographer to do to the photon emission spectrum | Remove low energy electrons and harden the beam |
| If the half-value layer of diagnostic radiographic equipment is too low, it may be corrected by | decrease filtration |
| When x-raying a thoracic spine, what compensating filter is most commonly used | wedge |
| filtration occurs as the primary beam passes through the glass window of the x-ray tube | Inherent |
| Al/Eq filter thickness would result in the lowest entrance skin dose to a patient | 3.0 |
| How many half-value layers must be added to the primary beam to reduce its intensity to less than 20% of its original value | 3 |
| What is the predominant interaction through most of the diagnostic x-ray range in the human body | compton |
| interactions with matter results in a radiograph with a long scale of contrast | compton |
| What is an annihilation reaction | Negatron is absorbed by another atom. Positron is crazy and comes to rest with another – electron. When they combine they make 2 new protons in diff directions |
| What is radiation fog | Any unwanted density form compton |
| At what energy level do electrons posses the highest total energy | K-shell |
| Scatter is when | |
| During photoelectric absorption, the ejected electron is called | photoelectron |
| What is attenuation | Loss of energy as beam passes through matter |
| Compton scattering occurs when an incident x-ray photon interacts with a | |
| electron | Outer shell |
| Secondary radiation energies are highest when using during fluoroscopic examinations | No skirt |
| What is a photoelectron | Ejected inner shell electron |
| A scattered photon possesses as the incident photon during coherent scattering | |
| The photon that exits the atom after a Compton scattering is called | Recoil electron |
| During the process of attenuation, the x-ray photon may interact with | |
| What happens if a photon interacts with matter and scatters | |
| What shell electron is ejected during photoelectric absorption | k |
| Some x-ray photons may pass through matter and not with that matter | interact |
| What happens to the x-ray photons in the beam during the process of attenuation | Some are absorbed and the others are scattered |
| Elements with Z numbers have inner shell electrons more tightly bound to the nucleus | high |
| What is Photoelectric Absorption | X-ray photon interaction with an inner shell electron |
| What happens as the angle of deflection is increased from 0 to 180 degrees | |
| As the angle increases the speed of the deflected e increases | |
| has a significant impact on the x-ray image | scatter |
| Photoelectric interaction with matter results in a radiograph with scale | |
| of contrast | High scale (extremities) |
| During the photoelectric interaction, as an electron transfers from an outer shell to a vacant inner shell, energy is released in the form of | photoelectron |
| What is the electron dislodged during Compton scattering called | recoil |
| An interaction which occurs between very low energy x-ray photons and matter is called | coherent |
| During Compton scattering, the incident photon energy is divided between the | ejected and the scattered |
| As the electrons shells move further from the nucleus, total electro energies | |
| and binding energies | increase, decrease |
| During Compton scattering, the incident photon energy is divided between what | Ejected electron and the scatter photon |
| What happens during pair production | Energy from the x-ray photon is converted to matter in the form of 2 electrons |
| What is photon absorption | |
| Energy released during the filling of the inner shell during photoelectric interaction is known as | |
| During photoelectric interaction, the incident x-ray photon must be than the binding energy of the inner-shell electron | greater |
| What happens during coherent scattering | Photons get excited and released energy into another photon with the same wavelength and frequency. |
| What is backscatter | Photon goes back in the direction it came from |
| What is the negatively charged electron termed during pair production | negatron |
| What happens as kVp increases, the total number of photons transmitted without interaction does what | increase |
| A photoelectric interaction is more likely to occur when the x-ray photon energy is slightly than the binding energy of the electrons | greater |
| A photoelectric interaction is more likely to occur with an electron which is bound in its orbit | loosely |
| As kVp , the percentage of Compton interactions | increase, increase |
| Photodisintegration is relevant in diagnostic imaging ranges. | NA |
Created by:
638323941
Popular Radiology sets