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Equipment Op.
| Question | Answer |
|---|---|
| T/F: If we increase the kinetic energy of the incident electron, it increases quality & quantity of beam, but reduces # of anode target interactions. | False |
| Target interaction occurs within what distance from the target surface? | 0.25mm to 0.50 mm |
| T/F: 99% of kinetic incident photon is converted to heat. | False |
| Brems interaction accounts for what % of x-ray beam? | 80 to 90% |
| What happens when incident electrons get closer to the atoms nucleus? | Brems interaction occurs, because photon energy increases |
| T/F: The selected kVp will be the maximum kEv for any possible photon. | True |
| What is filtration? | The elimination of low energy undesirable x-ray photons by insertion of absorbing materials (aluminum) into primary beam |
| What is the result of hardening of the x-ray beam? | Removes low energy photons, improves image quality by increasing beam energy |
| What is the standard filtering material? How is filtration expressed? | Aluminum, half value layer |
| What contributes to inherent filtration? | Glass envelope, dilectric oil bath, glass window of the tube housing |
| T/F: Tube aging increases inherent filtration. | True |
| What is added filtration? | Any filtration outside the tube & tube housing |
| What type of filter is used when you have uneven densities in body? | Compensating filter |
| Total filtration is the sum of? | Inherent & added filtration |
| Explain the effect of filtration on tube output and how you compensate for it. | Increasing technique |
| What is attenuation? | The reduction in # of x-ray photons as a result of interacting with matter. |
| Low energy photons interact with what part of the atom. | Whole atom |
| Medium energy photons interact with what part of the atom. | Orbital electrons |
| High energy photons interact with what part of the atom. | Nucleus |
| What are the 5 basic interactions w/matter. | Coherent, compton, photoelectric absorption, pair production & photodesintegration |
| Name the 2 interactions responsible for making x-ray photons. | Brems, characteristic |
| T/F: As kVp increases, the # of photons transmitted without interaction increases. | True |
| Which factor contributes to compton scatter. | Low energy kVp & volume of irradiated material |
| T/F: An increase in kVp decreases patient dose & produces shorter scale of contrast. | False |
| What are the 4 benefits of using a beam restriction device. | Low patient exposure dose, decrease scatter, increases visibility of detail, shortens scale of contrast |
| Name 3 advantages of using a modern collimator. | Localizing light, 2 sets of shutters to limit width & length, PBL (positive beam lighting) cannot open collimator larger than field receptor |
| Which agency makes sure Health Care Providers adhere to quality standards & safety. | Joint Commission |
| T/F: Fluoroscopy is a dynamic radiographic exam with active diagnosis during examination? | True |
| Which molecule in the body does MRI use? | Hydrogen protons |
| What is precession & why is it important for MRI? | The process of realigning hydrogen atoms & giving off energy. It is the basis of MRI |
| A 3.0 Tesla MRI magnet has approximately how many times the gravitational pull of the earth? | 60,000 |
| What are the 4 most common sites tested for bone densitometry? | Lumbar spine, bi-lateral hip, wrist |
| In CT what does the hounsefield unit represent? | Measurement of attenuation of x-ray beam |
| Which piece of technology propelled CT scanners into the next generation of helical scanning? | Slip rings |
| The volume of irradiated material comprises which 2 components? | Field size & patient thickness |
Created by:
Marby
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