Medical Physics

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Across
  1. 5. decrease in intensity of radiation passing through matter
  2. 8. process producing photons in a PET scan
  3. 9. effect of a frequency change of a wave from a moving object
  4. 10. computerised ___ ____ uses X-rays for 3-D imaging
  5. 14. electrons emitted by photon absorption
  6. 15. improves visibility of X-rays
  7. 16. radioisotope combined with other elements
  8. 19. detects radiation from injected radioisotopes
  9. 20. converts a photon into an electrical pulse
  10. 22. reversible effect in crystals converting strain into an emf
  11. 23. needed to 'see' X-rays
Down
  1. 1. converts gamma photons into light photons
  2. 2. describes a temporary high energy state radioisotope
  3. 3. Technetium-99m and Fluorine-18 are one of these
  4. 4. absorbs X-rays
  5. 6. when 2 materials have similar impedance values
  6. 7. product of density times speed of sound in a material
  7. 11. a cathode producing electrons
  8. 12. you are put in this for a CAT scan
  9. 13. Compton scattering is one of these
  10. 17. emits pulses of high frequency sound
  11. 18. sound above 20 kHz
  12. 21. doesn't absorb X-rays much