Dosimetry for IMRT

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Examples of Small and Novel Fields • GammaKnife (1 (1.8 8 cm diameter collimator is the largest collimator – intrinsically composite field – not 100 cm SSD) • Linac SRS beams (extrapolate to small field conditions) • Accuray (6 cm diameter di collimator lli is i the h largest l collimator) • TomoTherapy (5 cm is the largest slice width – no field flattening filter) • <strong>IMRT</strong> (made up of numerous small fields)
Static Field Calibration Uses a machine-specific reference field, fmsr Q Co�60 w D,w Q Q D msr � M �N �k �k k (D/ M) Q � w Qmsr (D/ M) Q w msr D Q w msr msr fmsr Corrects <strong>for</strong> the differences between the conditions of field size, geometry, g y, and beam quality q y of the conventional reference field and the machine-specific reference field.
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 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 78 and 79: Monitor Units Calculations for MMod
Page 80 and 81: Monitor Backscatter for Square On O

Dosimetry for IMRT

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