Dosimetry for IMRT

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Monitor Units Calculations <strong>for</strong> MModel-Based d l B d DDose CCalculation l l ti �� D �� ( Acal , dcal ) � � 0 M � Measured � � � (1 �bA ( cal )) dcal MUU �� D �� ( Acal , dcal ) � � � 0 �Calculated Ref Not including the effect of backscatter into the monitor it chamber h b will ill result lt in i about b t a 2% error at t worst. A
Backscatter into Monitor Chamber The effect is due to backscattered photons entering the monitor and resulting in feedback to the linac to lower its output Liu et al., Med. Phys 2000;27:737-744 Varian 2100 – 10 MV. Results with other jaw completely open
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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
Page 16 and 17:
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
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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 76 and 77: QA Accuracy y for IMRT • Previous
Page 80 and 81: Monitor Backscatter for Square On O
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Dosimetry for IMRT

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