Dosimetry for IMRT

More documents

Recommendations

Info

High Uncertainty in Output Factors EExample: l St Statistics ti ti of f 45 OOutput t t Factors F t <strong>for</strong> f 6 mm and d 18 mm square fi fields ld (Novalis, SSD = 1000 mm, depth = 50 mm, various detectors) Factor of Two in Beam Calibration! From Wolfgang Ullrich, BrainLab
Reasons <strong>for</strong> Drop in Output with Small Field Size • Backscatter into monitor unit from beam defining jaws • Reduced scatter (phantom and head) • Electronic disequilibrium • Obscuration of the source
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 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 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
show all

Dosimetry for IMRT

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?