Dosimetry for IMRT

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QA Accuracy y for IMRT • Previous ICRU 5% point-dose accuracy specification ifi ti replaced l d bby a volumetric l t i ddose accuracy specification. • Proposed new ICRU volumetric dose accuracy specification: - High gradient (≥ 20%/cm): 85% of points within 5 mm (3.5 mm SD), - Low gradient (< 20%/cm): 85% of points within 5% of predicted dose normalized to the prescribed dose (3.5% SD).
Monitor Units Calculations for MModel-Based d l B d DDose CCalculation l l ti D � 0 D ( Ar , ) � ( Ar , ) ( Ar , )(1 �bA ( )) MU MU � d A P Beam Output 0 Computed Directly �1 Correction to Account for Backscatter Into Monitor Chamber
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Dosimetry for IMRT Thomas Rockwell
Page 4 and 5:
Outline • Dosimetry Issues Releva
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Non-Uniform Intensity Changes the E
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Signal (fC) 12000 10000 8000 6000 4
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Outpuut Factorr 0.9 0.8 00.7 0.6 05
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High Uncertainty in Output Factors
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Problems with Conventional Output F
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Animation of Scanning Path From the
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Animation of Scanning Path From the
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Dose D Ratio Dosse Impact of Source
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No Difference Between Water and Sol
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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 46 and 47: ICRU Committee on IMRT Sponsors •
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 78 and 79: Monitor Units Calculations for MMod
Page 80 and 81: Monitor Backscatter for Square On O
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Dosimetry for IMRT

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