Physics Equations and Constants - Part 1

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  1. Compton Equation (Energy)
    Image Upload 1
  2. Compton Equation (Wavelength)
    • Image Upload 2
    • Image Upload 3
  3. Capacitor
    • Q=CV
    • Image Upload 4
  4. Resistor
    V=IR
  5. Inductor
    Image Upload 5
  6. Resistance
    • Image Upload 6
    • R = resistance
    • Image Upload 7 = resistivity
    • L = length
    • A = cross-sectional area
  7. Doppler Shift
    • Image Upload 8
    • Image Upload 9
  8. T1/T2 images
    • T1 = fat bright
    • T2 = water/fluids bright
  9. Detector Dead Time Correction
    • Image Upload 10 (non-paralyzable)
    • Image Upload 11 (paralyzable)
  10. Exposure to Kerma
    • Image Upload 12
    • XImage Upload 13
    • Image Upload 14
  11. Avogadro's number
    Na = 6.02x1023 atoms/mol
  12. Roentgen to C/kg
    R = 2.58x10-4 C/kg
  13. Curie to Bq
    1 Ci = 3.7x1010 Bq
  14. Kerma from attenuation coefficient
    Image Upload 15
  15. Bits to Bytes
    8 bits = 1 byte
  16. Transmission, Attenuation
    • Image Upload 16
    • Image Upload 17
  17. kB, MB, GB, TB
    • kB = 210 bytes
    • MB = 220 bytes
    • GB = 230 bytes
    • TB = 240 bytes
  18. Radiation Protection Barrier Transmission
    • Image Upload 18
    • Image Upload 19
    • Image Upload 20
  19. Film Gamma or Average Gradient
    Image Upload 21
  20. Electric Field and Voltage
    Image Upload 22

    Image Upload 23
  21. Special Relativity
    • Image Upload 24
    • Image Upload 25
    • Image Upload 26
    • Image Upload 27
  22. decibels
    • Image Upload 28
    • Image Upload 29
  23. Radioactive Decay, Half Life
    • Image Upload 30
    • Image Upload 31
    • Image Upload 32
  24. Magnification
    Image Upload 33
  25. Dose Equivalent, Effective Dose
    • Image Upload 34
    • Image Upload 35
  26. Average energy of beta decay particle
    1/3 of the max energy
  27. Gyromagnetic Ratio and Larmor Frequency
    • Gyromagnetic ratio for protons (H in water): Image Upload 36
    • Larmor Frequency: Image Upload 37   or   Image Upload 38
  28. Survival Fraction (Single target, Single hit) (Multiple target, Single hit)
    Image Upload 39 (Single target)

    Image Upload 40  (Multiple Target)
  29. Ion Chamber Temperature and Pressure Correction
    Image Upload 41
  30. Transient Equilibrium Activity of Daughter
    • Image Upload 42
    • Note: after about 4 Half-lives, the daughter is approximately in equilibrium with the parent. If branching ratio is 1, then the daughter has a slightly higher activity than the parent.
  31. Neutron beam activation saturation activity
    • Image Upload 43
    • Image Upload 44
  32. Temperature Conversions (Celsius to Kelvin, Celsius to Fahrenheit)
    • T[K] = T[C] + 273.15
    • T[F] = 9/5 T[C] + 32
  33. MeV/c2 to amu conversion
    1amu = 931.5 MeV/c2
  34. Sensitivity and Specificity; ROC Curve
    • Sensitivity = TP/(TP+FN)
    • Specificity = TN/(TN+FP)
    • ROC Curve is Sensitivity vs (1-Specificity)
  35. Hounsfield Unit
    Image Upload 45
  36. Exposure from Gamma Constant
    Image Upload 46

    Image Upload 47
  37. Fetal Dose Effects
    • During pre-implantation (1st week), the most likely result is death
    • During organogenesis (2-8 weeks), the most likely result is growth development and malformations
    • During early fetal stage (8-15 weeks), the most likely result is mental retardation
    • During mid to late fetal stage (15+ weeks), the most likely result is leukemia and other cancers
    • Threshold dose is likely around 10 cGy – 50 cGy
  38. What process competes with gamma ray emission?
    Internal conversion
  39. Optical Density Equation
    Image Upload 48
  40. What's the phase difference between the two surfaces of a piezoelectric crystal used in US?
    • Quarter-wave matching Image Upload 49
    • 90-degree phase difference
  41. Snell's Law
    Image Upload 50
  42. Speed of sound in fat and soft tissue?
    • In fat: 1450 m/s
    • In soft tissue: 1540 m/s
  43. Specific heat equation
    • Specific heat transfer: Image Upload 51
    • Fusion (change in state of matter): Image Upload 52
  44. Effective half life
    Image Upload 53
  45. What standard controls patient demography and billing info?
    HL7 (Health Level 7)
  46. What regulation controls patient anonymization?
    HIPAA
  47. What is the lower limit for a fringe field for MRI?
    5 Gauss = 0.5 mT
  48. An emission has only neutrino and characteristic x-ray, what's the decay scheme?
    Electron Capture
  49. If a gamma emission from a metastable state to stable state is forbidden, what's the alternative decay?
    Internal Conversion
  50. Focal Spot Blur
    Blur = spotsize*OID/SOD
  51. Secular equilibrium ratio of daughter to parent
    F = 1-(1/2)n where n is number of half lives
  52. Relation between HVL and TVL?
    TVL = 3.32 HVL
  53. Standard deviation values of Gaussian Distribution
    • +/-1 sigma = 68%
    • +/-2 sigma = 95%
    • +/-3 sigma = 99.7%
  54. Electron mass and charge
    • Mass = 9.1E-31 kg = 0.511MeV/c2
    • Charge = 1.6E-19 C
  55. According to NCRP 116 and ICRP report, what is the fatal risk of cancer by radiation for whole population for low dose rate and low LET
    5% per Sv of whole body
  56. According to FDA, the collimator or jaw of linac is required to be how many HVL layer?
    0.5% = 0.005 ~ 8HVL
  57. An atom that decays by releasing a positron has an excess of .. (neutrons, protons, electrons)
    protons
  58. Radiation Dose Limits
    • Occupational: 50 mSv/year
    • Extremities: 500 mSv/year
    • Eyes: 150 mSv/year
    • Fetus: 5 mSv/year

    Population: 1mSv/year
  59. Planck's Constant
    h = 6.62E-34 m2kg/s
Author:
Anonymous
ID:
166432
Card Set:
Physics Equations and Constants - Part 1
Updated:
2012-08-20 02:26:16
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Physics Equations Constants Part
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Physics Equations and Constants - Part 1
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