Comparative dosimetry report · Treatment Planning
Comparative plan report — re-irradiation IMPT vs IMRT
Sep 17, 2026 · K. Bhatt, CMD · 3 pages
G2 › Raman, Priya › Treatment Planning › Dosimetry › 2026-09-17 Comparative plan report
In packet · tab 6
COMPARATIVE PLAN REPORT — RE-IRRADIATION IMPT VS IMRT
Page 1 — Method: IMRT (VMAT) comparison plan generated on the same planning CT and CTV-recurrence as the IMPT plan; both prescribed 60 Gy(RBE) in 30 fractions.
Page 2 — Target coverage: CTV V95% 98.8% (IMPT) vs 98.5% (IMRT).
Page 3 — Organs at risk, this course only:
Spinal cord Dmax: 8.9 Gy(RBE) IMPT vs 21.7 Gy IMRT.
Brainstem Dmax: 6.2 Gy(RBE) vs 18.4 Gy.
Larynx mean: 18.9 Gy(RBE) vs 34.2 Gy. Mandible Dmax: 52.0 Gy(RBE) vs 60.8 Gy.
Summary: IMPT reduces dose to every previously irradiated organ at risk with equivalent target coverage.C-6