Rt

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Rt

  1. 1. Radiotherapy Goal Maximum dose to Tumor minimum dose to critical normal tissues
  2. 2. Conventional Portal for T3 Supraglottic Cancer
  3. 3. 3D Conformal Radiotherapy/IMRT Process • 3D CRT (developed in early 1990s)/IMRT (late 90s) • A CT data set of the ROI of the patient is obtained • Images Transferred to the contouring workstation (target volumes delineated along with OARs, dose prescription given) • Images transferred to TPS (Treatment planning) • Plan evaluation, Plan Approval, Plan implementation (sent to treatment unit)
  4. 4. IMRT (Intensity Modulated Radiotherapy) • Advanced form of 3DCRT • High Degree of conformity and sparing of critical structures
  5. 5. CRT VS IMRT 8 Conformal: can’t avoid some level of doses to the normal tissues IMRT: sculpt the doses (isodoses) to the tumor, avoiding the normal tissues.
  6. 6. IGRT (Image Guided Radio Therapy) • Verification of Treatment Set up with Image Guidance DRR from TPS is Matched with Treatment Port Film (From EPID). Any set-up errors are corrected before Start of Treatment Planning CT scan is matched with Cone Beam CT scan generated on the machine (Auto-corrected)
  7. 7. • u
  8. 8. THANK YOU

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