Electron Beams: Physical and Clinical Aspects

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Link to IAEA Radiation Oncology Physics: A Handbook for Teachers and Students
Slides: Chapter 8. ELECTRON BEAMS: PHYSICAL AND CLINICAL ASPECTS
Text: Chapter 8. ELECTRON BEAMS: PHYSICAL AND CLINICAL ASPECTS

Contents

[edit] CENTRAL AXIS DEPTH DOSE DISTRIBUTIONS IN WATER

Megavoltage electron beams represent an important treatment modality in modern radiotherapy, often providing a unique option in the treatment of superficial tumours (less than 5 cm deep). Electrons have been used in radio- therapy since the early 1950s, first produced by betatrons and then by microtrons and linacs. Modern high energy linacs typically provide, in addition to two megavoltage photon energies, several electron beam energies in the range from 4 to 22 MeV.

  1. General shape of depth dose curve
  2. Electron interactions with absorbing medium
  3. Inverse square law (virtual source position)
  4. Range concept (csda)
  5. Buildup region (depths between surface and zmax)
  6. Dose distribution beyond zmax

[edit] DOSIMETRIC PARAMETERS OF ELECTRON BEAMS

  1. Electron beam energy specification
  2. Typical depth dose parameters as a function of energy
  3. Percentage depth dose
  4. Output factors
  5. Therapeutic range
  6. Profiles and off-axis ratios
  7. Flatness and symmetry

[edit] CLINICAL CONSIDERATIONS IN ELECTRON BEAM THERAPY

  1. Dose specification and reporting
  2. Small field sizes
  3. Isodose distributions
  4. Field shaping
  5. Irregular surface correction
  6. Bolus
  7. Inhomogeneity corrections
  8. Electron beam combinations
  9. Electron arc therapy
  10. Electron therapy treatment planning

[edit] BIBLIOGRAPHY

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