clinical electron beam characteristics

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Information about clinical electron beam characteristics
Science-Technology

Published on November 22, 2008

Author: senthil1414

Source: authorstream.com

Clinical Electron beam characteristics : Clinical Electron beam characteristics p.Senthil kumar m.sc(medical physics)‏ Linear accelerator head : Linear accelerator head Electron source : Electron source Slide 4: Central axis depth dose Absorbed dose build-up : Absorbed dose build-up Slide 6: Absorbed dose at surface Depth in water in cm Slide 7: Isodose curves Range concept : Range concept Electron beam energy specification : Electron beam energy specification The most probable energy Ep,0 Ep,0 = 0.22 + 1.09Rp + 0.0025Rp ² The mean electron energy E0 E0¯ = CR50 where C = 2.33 MeV/cm for water. Ez, the mean energy at a depth z in a water phantom, is related to the practical range Rp by the Harder equation as follows Ez = E0 (1 – z/Rp)‏ Slide 10: TYPICAL DEPTH DOSE PARAMETERS OF ELECTRON BEAMS Energy R90 R80 R50 Rp E0 Surface dose (MeV) (cm) (cm) (cm) (cm) (MeV) (%)‏ 6 1.7 1.8 2.2 2.9 5.6 81 8 2.4 2.6 3.0 4.0 7.2 83 10 3.1 3.3 3.9 4.8 9.2 86 12 3.7 4.1 4.8 6.0 11.3 90 15 4.7 5.2 6.1 7.5 14.0 92 18 5.5 5.9 7.3 9.1 17.4 96 Field size dependence : Field size dependence Back scattering of electrons : Back scattering of electrons Field shaping : Field shaping Electron beam applicators Shielding and cut-outs Electron applicators : Electron applicators Slide 15: Shielding and cut-outs LEAD THICKNESS (mm) REQUIRED FOR VARIOUS TRANSMISSION LEVELS FOR A 12.5 × 12.5 cm2 ELECTRON FIELD Energy (MeV)‏ Transmission (%) 6 8 10 12 14 17 20 50 1.2 1.8 2.2 2.6 2.9 3.8 4.4 10 2.1 2.8 3.5 4.1 5.0 7.0 9.0 5 3.0 3.7 4.5 5.6 7.0 8.0 10.0 Clinical applications of electron beam therapy : Clinical applications of electron beam therapy Slide 17: Thank you

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