Chapter 4 review

12345678910111213141516171819202122232425
Across
  1. 3. partial absorption of energy
  2. 6. is characterized by the energy contained in the photon. X-ray photon has more E than that of a light or RF photon.
  3. 7. Responsible for producing images.
  4. 12. Smallest bundle of energy traveling through space at the speed of light
  5. 13. in a straight line.
  6. 14. soft tissue ~allows transmission of x-rays with decreased intensity, some change in direction.
  7. 18. describes radio waves in terms of frequency, such as television or radio stations. RF has low energy and long wavelengths. Very short wavelength RF is microwave radiation
  8. 21. - Energy radiated through space accompanied by electrical and magnetic fields.
  9. 23. no mass.
  10. 24. and magnetic fields are 90-degrees to each other.
  11. 25. intensity is INVERSELY related to the square of the distance from the source
Down
  1. 1. Number of cycles passing any given point
  2. 2. half of the range from crest to valley
  3. 4. - The smallest amount of energy that can be emitted or absorbed in the from of electromagnetic radiation is known as quantum .
  4. 5. No light passes through
  5. 6. square law- Relates beam intensity to distance from the source (focal spot source of x-rays)
  6. 8. from one crest to another
  7. 9. ray- come from inside the nucleus of a radioactive atom, and they are emitted spontaneously from radioactive material.
  8. 10. -bone ~ absorbs x-rays.
  9. 11. Is a phenomenon when wavelength increases, energy behaves more wave like
  10. 15. energy of the radiation absorbed or emitted is directly proportional to the frequency of the radiation.
  11. 16. occupies the smallest segment of the electromagnetic spectrum, but the only portion we can sense directly
  12. 17. Smallest quantity of any type of electromagnetic radiation
  13. 19. photons, travel @ the speed of light and either exist with a velocity of speed of light or do not exist at all.
  14. 20. opposite is true for x-rays: behave more like particles than waves.
  15. 22. of varying degrees of absorption of the useful x-ray beam as it passes through the tissues of the body.