Sonography Physics I Keywords

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Across
  1. 3. Any mechanical system produces heat, as the wave propagates it loses energy to the surrounding medium
  2. 4. Interference if two or more in phase waves are created in the same physical region, the energy of the waves combines to construct one larger wave.
  3. 9. A concentration of force, or force per area, in the compression phase of propagation the pressure increase, in rarefaction the pressure decreases.
  4. 10. Tool that converts one form of energy into another
  5. 13. Particles move back and forth about their original location locally, allowing the concentration of the energy to propagate along the wave path.
  6. 16. Waves that propagate by particle motion that is perpendicular or “transverse” to the wave propagation direction.
  7. 18. Type of wave that doesn't need a medium to travel.
  8. 19. During compression density (more/higher particle density) increases, during rarefaction density decreases (less/lower particle density.
  9. 21. Echoes sent from the transducer reflect back from interfaces and produce a dot.
  10. 22. Sounds that are over 20,000 mhz.
  11. 24. Type of wave that needs a medium to travel.
  12. 25. The physical distance from one compression to the next compression.
  13. 26. Converted from electricity into sound
  14. 27. Array where pulses originate from different starting points (as in a linear image), but each pulse (and scan line) travels in a slightly different direction from that of the previous one (as in sector image).
Down
  1. 1. A measure of how “big” or “strong”. Formally defined as the maximum variation of a variable from its mean value.
  2. 2. Drawing where the measurement of time and of distance appear as the same characteristic in the drawing.
  3. 5. Type of ultrasound that can detect and measure blood flow
  4. 6. The distance sound can travel per unit of time.
  5. 7. When two waves are not purely in phase or out of phase. The waves add up only partially building a “bigger” wave, but not completely as the sum of the two waves.
  6. 8. Determined by the source of the wave. If the source creates many compressions per second, then the wave will have a higher of this characteristic.
  7. 11. The principle of converting energy by applying pressure to a crystal.
  8. 12. Pie-shaped array that emits a pulse from one starting point.
  9. 14. Type of array that yields a rectangular image and has multiple starting points
  10. 15. Mechanical energy that is transmitted through a medium by forces acting on molecules.
  11. 17. Converted from sound to electricity
  12. 20. Propagation that by particle compression and rarefaction results in particle motion that is “along” or in the same direction as the wave propagation direction.
  13. 23. Interference when two waves are completely out of phase. The result is wave cancellation.