TPS modeling and Beam commissioning at UIHC Radiation Oncology
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Transcript of TPS modeling and Beam commissioning at UIHC Radiation Oncology
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ROTATION 5: TPS MODELING AND BEAM COMMISSIONING at UIHC Radia9on
Oncology Mentors: John Bayouth, Ph.D.
(04/23/09 – 06/11/09)
By Vibha Chaswal
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Goals
• Model 1 photon beam -‐ Know parameters and their effects
• Model 1 electron beam
-‐ Know parameters and their effect
• Model Wedges
• Validate the beams modeled
• Understand the nuances of TPS modeling
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Photon beams: data requirements
• Pdds • Profiles • Calibra9on output factor • Rela9ve output factors Data For Valida9on! -‐ A subset of above -‐ Sc and Sp -‐ Dosimetric tests, match computed and measured dose distribu9ons
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Data collected for assumed clinical applica9on
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TPS modeling: The Machine
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TPS Modeling: The machine
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TPS Modeling: The Radia9on Beam
• Fine tuning Profiles -‐ Effec9ve source size for Penumbra matching
-‐ Gaussian width and height of FF scacer source for tails
-‐ Transmission factors of Jaw and MLC for tails region
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Energy Spectrum
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Energy Spectrum: Build-‐up region
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In-‐field Region: FF acenua9on using cone model
With Off-‐axis Soeening factor
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In-‐field Region: FF acenua9on using arbitrary profile
With Off-‐axis Soeening factor
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Off-‐axis soeening
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Out-‐of field regions: Penumbra and tails
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Out-‐of field modeling parameters
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Beam Valida9on: PDDs
Result: All Pdds pass within 2% or 2mm
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Beam Valida9on: Profiles
Result: Within 3% or 3mm except outliers in tail regions
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Beam Valida9on tests: MU verifica9on
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Beam valida9on: R and V import
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Rela9ve Decision Maps: error Limit = 3 %, dta Limit = 3 mm
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TPS Modeling: The machine, Collimator rota9on incorrect
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Electron beams: Data required
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Electron Beam Parameters
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Two adjustable parameters
- Off-axis ratios, and
- The scatter correction factor (FMCS), dose spread out in media relative to air.
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Electron Beam modeling
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Electron PDD
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Thank you!!!!!