Medical Physics

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