Dosimetry for IMRT

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ICRU Committee on <strong>IMRT</strong> Sponsors • André Wambersie MD, PhD, Brussels, Belgium • Paul DeLuca PhD, Madison, USA • RReinhard i h d Gahbaue G hb MD, MD Ph.D, Ph D Cleveland, Cl l d USA • Gordon Whitmore Ph.D, Toronto, Canada Chairmen • Vi Vincent t Grégoire G é i MD PhD, PhD Brussels, B l Belgium B l i • T. Rock Mackie PhD, Madison, USA Members • Wilfried De Neve MD PhD PhD, Gent Gent, Belgium • Mary Gospodarowicz MD, Toronto, Canada • Andrzej Niemierko PhD, Boston, USA • James A. Purdy y PhD, Davis, USA • Marcel van Herk PhD, Amsterdam, The Netherla • Nilendu Gupta PhD, Colombus, USA Consultants • Anders Ahnesjö PhD, Uppsala, Sweden • Michael Goiten PhD, Windisch, Switzerland
Supplement to ICRU-50 and ICRU-62 • More emphasis on statistics. • Prescription and reporting with dose-volume specifications. p • No longer use ICRU-Reference Point. • Want median dose D50% reported. • Use model-based dose calculations. • Include the effect of tissue heterogeneities. R t d t ll f t t d • Report dose to small mass of water, not dose to tissue.
Page 1: Dosimetry for IMRT Thomas Rockwell
Page 4 and 5: Outline • Dosimetry Issues Releva
Page 6 and 7: Non-Uniform Intensity Changes the E
Page 8 and 9: Signal (fC) 12000 10000 8000 6000 4
Page 10 and 11: Outpuut Factorr 0.9 0.8 00.7 0.6 05
Page 12 and 13: High Uncertainty in Output Factors
Page 14 and 15: Problems with Conventional Output F
Page 16 and 17: Animation of Scanning Path From the
Page 18 and 19: Animation of Scanning Path From the
Page 20 and 21: Dose D Ratio Dosse Impact of Source
Page 22 and 23: No Difference Between Water and Sol
Page 24 and 25: Small Vs. Farmer Chambers A1SL: 0.0
Page 26 and 27: The Same Technique Could Be Applied
Page 28 and 29: Measurements Would Benchmark Source
Page 30 and 31: Audit for TRS 398 Reference Dosimet
Page 32 and 33: IMRT Is About Using Small Fields In
Page 34 and 35: Meeting for the Dosimetry Code of P
Page 38 and 39: Examples of Small and Novel Fields
Page 40 and 41: Calculate Using MC Using method of
Page 42 and 43: Dose Calibration Correction Factor
Page 44 and 45: “Effective kQ” for Tomo 1. Dete
Page 48 and 49: QA for IMRT • Appropriate QQA of
Page 50 and 51: 1 mm Bands Leaf Positioning Errors
Page 52 and 53: Radiation Field Edge Offset 0.7mm o
Page 54 and 55: Dynamic Multileaf Collimator MLC (D
Page 56 and 57: TomoTherapy py Leaf Latencyy • To
Page 58 and 59: End-to-End QA
Page 60 and 61: Dose (GGy) On and Off-Axis Results
Page 62 and 63: Delivery QA Panel
Page 64 and 65: NNote t th the High Gradients Compa
Page 66 and 67: Independent Calculation
Page 68 and 69: Gamma Function � ( r , r ) �{[
Page 70 and 71: Molineu et al IJROBP 2005 Ibott et
Page 72 and 73: Dm/Dc 1.2 1.15 1.1 1.05 1 0.95 0.9
Page 74 and 75: Frequency Inter-Institution Dose Ac
Page 76 and 77: QA Accuracy y for IMRT • Previous
Page 78 and 79: Monitor Units Calculations for MMod
Page 80 and 81: Monitor Backscatter for Square On O

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