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MIT 211 -Week 5
Image Quality
| Question | Answer |
|---|---|
| What is the essential outcome of the Compton effect? | Scatter radiation |
| What effect increases as radiation increases? | Compton scatter |
| What interaction occurs when the photon is absorbed by the atom? | Photoelectric effect |
| What tool is used in radiographic exams of high kVp to avoid compton scatter? | Grid |
| What interaction happens in the tube vs body? | Electron interaction in the tube; Photon interaction in the body |
| What is the definition of transmission? | Photon reaches the Ir without interaction in the body due to the intensity of the energy |
| What is the definition of attenuation? | the reduction in the intensity or number of X-ray photons as they pass through a material, like the human body; how much a material "stops" or weakens the X-ray beam. |
| Increased kVp increases what other effect? | Compton Scatter and transmission |
| Decreased kVp decreases what other effect? | Photoelectric effect |
| What is the main technical factor that controls contrast (gray scale)? | kVp |
| What is the primary controlling factor of quantity of x-ray to hit the IR? | mAs |
| How does the increase of kVp effect mAs? | Increasing kVp by 15% increases mAs (quantity) of x-rays by 50% |
| What adjustments need to be made to kVp when using a higher level of grid ratio ? | Increase in kVp |
| What is the purpose of tube filtration? | Filter out low level (non-useful) x-rays |
| What is spatial resolution? | Details of the image (blurring or unsharpness of quality of image) |
| What is always minimized but never decreased in terms of spatial resolution and distortion? | OID |
| What controls optical Density or Receptor Exposure? | Main Controlling Factor is mAs |
| Which technical factor is adjusted to push x-ray beams through tissue to image receptor? | kVp |
| What is bit depth? | the amount of different types of grays that can be displayed; which increases contrast resolution |
| What 2 things produce noise? | Quantum mottling (grainy)(too few xrays hitting receptor),, Scatter (adding unwanted exposure |
| What are the two factors that affect magnification/ | SID and OID, making images look longer/shorter (distortion) |
| What is the relationship between kVP and contrast scales ? | Increased kVP gives you long scale (low contrast) , Decreased kVP gives you low scale (high contrast) |
| How does pixel size effect resolution? | Smaller the pixels ,the more detail and greater scale |
| How does bit depth effect resolution? | The increase in bit depth, the better the image |
| What is the definition of brightness? | the measurement of the luminance of an area in a radiographic image displayed on a monitor. |
Created by:
kdabney22
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