Dosimetric Characteristics of Clinical Photon Beams

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Sources of Direct and Indirect Radiation � A Monte Carlo study (Chaney et al., Med. Phys. 21,1994) � Siemens MD2, 6MV Direct Indirect
Characterizing Dosimetric Properties of Clinical Photon Beams � Beam penetration �� Normalized depth dose (NDD) or tissue phantom ratio (TPR). � Beam Output � Total output ratio: S c,p, in-air output ratio: S c, phantom scatter factor: S p. �� Cross Cross-beam beam profile � Isodose distribution. �� Attenuation factors for beam modifiers � hard wedges, compensators, trays, etc. With the ultimate goal of ensuring that computerized treatment With the ultimate goal of ensuring that computerized treatment plans accurately reflect the dose received by patients
Page 1 and 2: Dosimetric Characteristics of Clini
Page 3 and 4: Learning g Objectives j �Understa
Page 5: Sources of radiation that determine
Page 9 and 10: Normalized Depth Dose Data Energy D
Page 11 and 12: Normalized Depth Dose Data Wedge/Op
Page 13 and 14: Normalized Depth Dose Data Field si
Page 15 and 16: Monte Carlo Calculated Average Ener
Page 17 and 18: Equivalent square d Sterling g Form
Page 19 and 20: Measurement of Normalized Depth DDo
Page 21 and 22: S c c S p �� s � Beam Output
Page 23 and 24: Monte Carlo Calculations of In- Sim
Page 25 and 26: Energy spectrum of head scattered p
Page 27 and 28: Flattening Filter Beam Modifier (in
Page 29 and 30: Cross Beam Characteristics � Affe
Page 31 and 32: Cross Beam Profile 6 MV Photon Beam
Page 33 and 34: Effect of a Dipole p Magnet g on Ex
Page 35 and 36: Isodose Distribution 30 cm X 30 cm
Page 37 and 38: Isodose Distributions (20 X 20 Cm2
Page 39 and 40: Detector Size Effect on TPS Commiss
Page 41 and 42: IMRT QA results: DTA 2%/2 mm CC13 C
Page 43 and 44: Measurement of Wedge Factors � Th
Page 45 and 46: Approaches to Dose Computation Algo
Page 47 and 48: Accuracy Goal in Dose Calculations
Page 49 and 50: Characterizing Clinical Photon Cave
Page 51 and 52: Benchmark Dataset (D (Developed l d
Page 53: Summary �It is quite evident that

Dosimetric Characteristics of Clinical Photon Beams

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