Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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• 5 proton centers inoperation• At least 5 moreunder constructionProton Treatments
How significant can this be?Stray Radiation Exposure from Different RT FacilitiesH/D (mSv/Gy)1000.00100.0010.001.000.100.010.000 50 100 150Distance from Field Edge (cm)Hall, Harvard, Passive,Normalized to 10x10 cm2Yan, Harvard, Passive, 8 cmSOBP, FS=5x5 cm2Zheng, PTCH, Passive, 8 cmSOBP, FS=10x10 cm2Hall, 4 Field CRT, 6 MVZheng, PTCH, Passive, PristinepeakHall, IMRT, 6 MVSchneider, PSI, Scanning,Pristine peakMesolaras, MRPI, PassivePolf, Harvard, Passive, LargeField, 8 cm SOBPTayama, PMRC, Passive, 10 cmSOBP, FS=11 cm2Fontenot, Harvard, Radiosurgery,pristine peakYan, Harvard, Passive,RadiosurgeryYan, Harvard, Ocular, 2.3 cmSOBPSlide Hall courtesy (2006) of J Fontenot
Page 1 and 2: Appropriate Planning inRadiation On
Page 3 and 4: Secondary Cancer Risk in Radiation
Page 5 and 6: Calculations of Risk withEarly IMRT
Page 7 and 8: Dose Levels in RT Patients (3D CRT
Page 9 and 10: Two Ways to Determine Absorbed Dose
Page 11 and 12: 3D VIP-Man Model fromthe Visible Hu
Page 13 and 14: Comparison of Calculated and Measur
Page 15 and 16: Results: Total (Photon + Neutron) O
Page 17 and 18: Monte-Carlo Calculations: Summary
Page 19 and 20: Most Recent Measurements• Anthrop
Page 21 and 22: Pediatric Procedures• Pediatric C
Page 23 and 24: Neutron Measurements• Neutron flu
Page 25 and 26: Neutron Measurement Cautions• Gol
Page 27 and 28: Risk (%) of Secondary Cancer perCom
Page 29: Dose Equivalent and Risk (%) perCom
Page 33 and 34: Comparison of the doses in the pedi
Page 35 and 36: Take Home Message• Biggest uncert

Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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