IRiM: equations

42 flashcards · Physics · by Kristóf Nagy

  1. E and momentum relation

  2. Compton scatter: photon E

  3. photon momentum pγp_\gammapγ​

    just add /c to the energy

  4. transmission in terms of attenuation

  5. E transmission in terms of energy absorbtion

  6. ratio from all transmitted energy of by photons

  7. (mass) attenuation coefficient

  8. (mass) energy absorbtion coefficient

  9. (mass) energy-transfer coefficient

  10. bremsstrahlung yield

  11. linear attenuation coefficient, mean free path

    mean free path = 1 / linear attenuation coefficient

  12. combine mass attenutation coefficients

  13. water density

  14. Becquerel (Bq)

    decay per second (A)

  15. N_0 and A_0

  16. total number of decays, N_t

  17. decay N, activity A

  18. half life

  19. effective (bio and phys)

  20. sin cos tan

  21. small angle approximation

  22. (collimator thickness)

  23. collimator spatial resolution

    b = distance form collimator

  24. leffl_{eff}leff​

  25. contrast.

    (in counts)

  26. (CNR, contrast to noise ratio)

  27. PET sensitivity

  28. PET geometric efficency, gACDg_{ACD}gACD​

  29. sphere surface A

  30. PET spatial resolution

  31. PET detector resolution contribution RdR_dRd​

  32. PET non-collinearity resolution contribution RNC,R180°R_{NC}, R_{180°}RNC​,R180°​

  33. PET geometric efficency, source at center, gtotg_{tot}gtot​

  34. PET, s both

  35. PET, s single

  36. PET, s none

  37. PET, attenuation correction factor

  38. equal fractions

    only works if same big time D=d*n

  39. LQ model, cell survival, S(D)

  40. RBE

  41. OER

  42. pinhole collimator magnification

    The equation for magnification (M) of a pinhole collimator is: M=IO=fbM = \frac{I}{O}=\frac{f}{b}M=OI​=bf​