Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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Experimental SetupHeadHip23.5 cm23 cmShoulder
Comparison <strong>of</strong> the doses in the pediatric CranioSpinal casetreated <strong>by</strong> 3D-conventional, tomotherapy, and proton therapyOrgan site3D 6 MV(cGy)TomoTherapy(cGy)Proton(120-180 MeV)(cSv)Thyroid 2797 (12) 362 (12) 22Lt. Breast Bud 152 (9) 437 (6)Heart center 2957 (41) 865 (16) 21.8Heart edge 2345 (18) 438 (16)Lt. Lung center 226 (13) 907 (43)Lt. Lung Edge 242 (33) 446 (9)Liver Center 2583 (18) 1107 (124)Liver edge 217 (14) 545 (16)Lt. Kidney 221 (6) 748 (83)Bladder 195 (11) 77 (2) 17.7Pelvic 86 (4) 528 (30)Lt. Ovary 322 (60) 135 (22)Data from S. Lazar and Z. Wang, MDACC
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 and 30: Dose Equivalent and Risk (%) perCom
Page 31: How significant can this be?Stray R
Page 35 and 36: Take Home Message• Biggest uncert

Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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