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Electron Beams: Physical Principles and Dosimetry Kent A. Gifford, Ph.D. Department of Radiation Physics UT M.D. Anderson Cancer Center [email_address] Medical Physics III: Spring 2010
Physical aspects
Electron Interactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Electron Interactions ,[object Object],[object Object],[object Object],[object Object]
Electron Interactions ,[object Object],[object Object],[object Object]
Electron Interactions ,[object Object],[object Object],E  
Electron interactions Absorbed dose ,[object Object],[object Object]
Electron beam characteristics ,[object Object],[object Object],[object Object],[object Object],[object Object]
Electron Energy Specification ,[object Object],[object Object],[object Object]
Electron Energy Specification ,[object Object],[object Object],[object Object],From: Khan
Electron Energy Specification ,[object Object],[object Object],[object Object],MDACC 21EX AAPM TG-25  Med Phys 18(1), 73-109 (1991)
Determination of Absorbed Dose ,[object Object],[object Object],[object Object],[object Object],[object Object]
Depth-Dose Distribution ,[object Object],[object Object],[object Object],[object Object],[object Object]
Clinical aspects and dosimetry
Characteristics of clinical electron beams X-Ray Contamination Surface Dose Depth of 80% Dose Depth of 50 % dose Depth of  90% Dose
Characteristics of Clinical Electron Beams ,[object Object],[object Object],From: Khan
Characteristics of Clinical Electron Beams ,[object Object],[object Object],[object Object],MDACC 21EX
Characteristics of clinical electron beams ,[object Object],[object Object],[object Object],MDACC 21EX
Characteristics of clinical electron beams ,[object Object],[object Object],[object Object],[object Object],MDACC 21EX
Characteristics of clinical electron beams ,[object Object],[object Object],[object Object],From: Tapley
Characteristics of clinical electron beams ,[object Object],[object Object],[object Object]
Electron Beam Dosimetry Isodoses (6 MeV)
Electron Beam Dosimetry Isodoses (20 MeV)
Electron Beam Dosimetry PDD- effect of field size (6 MeV)
Electron Beam Dosimetry PDD- effect of field size (20 MeV)
Electron Beam Dosimetry Beam abutment
Electron Beam Dosimetry Beam abutment- electrons (6 & 20 MeV)
Electron Beam Dosimetry Beam abutment- electrons (6 & 12 MeV)
Electron Beam Dosimetry Beam abutment- electrons
Electron Beam Dosimetry Beam abutment- photon & electron (6 MeV & 6 MV)
Electron Beam Dosimetry Beam abutment- photon & electron (6 MeV & 18 MV)
Electron Beam Dosimetry Beam abutment- photon & electron (IMC & tangents)
Electron Beam Dosimetry ,[object Object],[object Object],From: Khan
Electron Beam Dosimetry Obliquity effects
Electron Beam Dosimetry ,[object Object],[object Object],[object Object],t  = mm Pb E 0  = Nom E (MeV)
Electron Beam Dosimetry ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],From: Khan
Electron Beam Dosimetry ,[object Object],[object Object],[object Object],From: Khan
Electron Beam Dosimetry ,[object Object],[object Object],1 cm For Lung: For Bone: 3 cm 
Electron Beam Dosimetry ,[object Object],[object Object],[object Object],From: Khan (Note E in  M eV) A dose enhancement of about 50% could be expected in a 6-MeV electron beam
Electron Beam Dosimetry ,[object Object],[object Object],Electron energy at the scatterer From: Khan
Electron Beam Monitor-Unit Calculations ,[object Object],[object Object]
Electron Beam Monitor-Unit Calculations ,[object Object],[object Object]
Electron Beam Monitor-Unit Calculations ,[object Object],Electron-beam output for a field size FS at a distance SSD Calibrated output for a 10X10 cm field at 100 cm SSD Output factor for field size FS relative to field size 10X10 Distance-correction factor for distance SSD relative to 100 cm   SSD
Monitor-Unit Calculations ,[object Object],[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object]
Monitor-Unit Calculations ,[object Object],[object Object],[object Object],[object Object]
Electron Monitor-Unit Calculations - Sample Problems
Electron Monitor-Unit Calculations - Sample Problems
Electron Monitor-Unit Calculations - Sample Problems
Electron Monitor-Unit Calculations - Sample Problems
Electron MU Sample Problems

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