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 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
 Hsc 340 10 14
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Hsc 340 10 14

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  • 1. HSC 340 10-14-10 <ul><li>Photon Dose Distributions </li></ul><ul><ul><li>Single and multi-field distributions </li></ul></ul><ul><ul><li>Corrections </li></ul></ul><ul><ul><li>Tx plan essentials </li></ul></ul><ul><li>Electron Dose Distributions </li></ul><ul><ul><li>Physics </li></ul></ul><ul><ul><li>Characteristics </li></ul></ul><ul><ul><li>Treatment Planning </li></ul></ul>
  • 2. Photon Dose Distribution <ul><li>What are dose distributions? </li></ul><ul><ul><li>Pg. 528 PDD </li></ul></ul><ul><ul><li>Beam Profile </li></ul></ul><ul><ul><li>Flattening Filter </li></ul></ul><ul><li>What are isodose distributions? </li></ul>
  • 3. Isodose distributions <ul><li>Open fields </li></ul><ul><li>Wedged fields </li></ul><ul><li>Multiple fields </li></ul><ul><ul><li>POP </li></ul></ul><ul><ul><li>Wedged pair </li></ul></ul>
  • 4. Corrections <ul><li>Contour/Obliquity </li></ul><ul><ul><li>P’=P x {SSD+d m /SSD+d m +h} 2 </li></ul></ul><ul><li>Heterogeneity </li></ul><ul><ul><li>D actual= d 1 +d 2 +d 3 </li></ul></ul><ul><ul><li>d eff= p e d 1 +p e d 2 +p e d 3 </li></ul></ul><ul><li>Table 25-2 and table 25-3 </li></ul>
  • 5. Treatment Planning Essentials <ul><li>Rationale for 3-D conformal </li></ul><ul><ul><li>Overall goal to deliver 100% dose to tumor and deliver 0% to critical structures. </li></ul></ul><ul><ul><li>Figure 25-12 </li></ul></ul><ul><li>3-D treatment planning & delivery methods </li></ul><ul><ul><li>Need CT </li></ul></ul><ul><ul><li>IMRT & 3D CRT </li></ul></ul>
  • 6. Algorithms <ul><li>Dose calc process </li></ul><ul><li>Data driven </li></ul><ul><ul><li>Bentley-Milan (rarely used) </li></ul></ul><ul><li>Model driven </li></ul><ul><ul><li>ADAC Pinnacle </li></ul></ul><ul><li>2-D vs 3-D </li></ul><ul><ul><li>Pg. 25-4 </li></ul></ul>
  • 7. Algorithms cont. <ul><li>What should an algorithm be evaluated on? </li></ul><ul><li>Calculation Algorithms </li></ul><ul><ul><li>Scatter Integration </li></ul></ul><ul><ul><li>Convolution Algorithm </li></ul></ul>
  • 8. Treatment Planning Concepts <ul><li>Planning volumes </li></ul><ul><li>Read Box 25-2 on your own. </li></ul><ul><li>Prescriptions are often based on iso lines </li></ul><ul><li>DVH </li></ul>
  • 9. Treatment Planning Process <ul><li>Image </li></ul><ul><li>Contour </li></ul><ul><li>Delineate Treatment Fields </li></ul><ul><li>Evaluate and Implement </li></ul>
  • 10. Electron dose distributions <ul><li>Interactions are different from photon beam </li></ul><ul><li>Collisional and Radiation Interactions </li></ul><ul><li>Energy Dependence </li></ul><ul><li>Dependence of depth </li></ul><ul><li>Production of Clinically useful e- </li></ul><ul><li>Scattering foils vs. scanning beams </li></ul>
  • 11. Characteristics of e- beams <ul><li>Dose gradients of clinically useful e- beams </li></ul><ul><li>Shapes </li></ul>
  • 12. Treatment Planning <ul><li>Rules of thumb </li></ul><ul><li>Surface characteristics </li></ul><ul><li>Build-up region characteristics </li></ul><ul><li>Energy dependence </li></ul><ul><li>Distance correction factors </li></ul><ul><li>Effective point source </li></ul><ul><li>Virtual source </li></ul>
  • 13. Irregular fields and e- beams <ul><li>Shielding </li></ul><ul><li>Internal shielding </li></ul><ul><li>Effects on dose </li></ul><ul><li>Tissue heterogeneity and dose </li></ul><ul><li>Gaps </li></ul><ul><li>Read Clinical Cases pg.559 </li></ul>

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