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Radiotherapy
Goal Maximum dose to Tumor minimum dose to critical normal tissues
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Conventional Portal for T3 Supraglottic Cancer
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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)
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IMRT(Intensity Modulated Radiotherapy)
• Advanced form of 3DCRT
• High Degree of conformity and sparing of critical structures
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CRT VS IMRT8
Conformal: can’t avoid
some level of doses to the
normal tissues
IMRT: sculpt the doses
(isodoses) to the tumor,
avoiding the normal
tissues.
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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)
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• u
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