Lecture Notes of Dose distribution calculation inside phantom with ...
Lecture Notes of Dose distribution calculation inside phantom with ...
Lecture Notes of Dose distribution calculation inside phantom with ...
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1 Outlines <strong>of</strong> sample user code ucxyz <strong>phantom</strong>.fucxyz <strong>phantom</strong>.f is the egs5 user code to perform following <strong>calculation</strong>s.1. Geometry (Fig. 1) 3-dimensional volume element (voxel) geometry number <strong>of</strong> z-direction bin 22 number <strong>of</strong> y-direction bin 3 number <strong>of</strong> x-direction bin 3 <strong>phantom</strong> is modeled <strong>with</strong> water <strong>of</strong> 30cmx30cm area and 20cm depth. 5cm air region exits at before and after <strong>phantom</strong>.Phantom (water)AirZAirxbin 3xbin 247Xxbin 131069ybin 125Last zbin 22ybin 2ybin 38zbin 1zbin 2YFigure 1: geometry <strong>of</strong> ucxyz <strong>phantom</strong>.f.2. Source conditions Source photon energy is 1.253 MeV. A point isotropic source exits at sposi(=10cm) from a <strong>phantom</strong> surface. Half-beam size at the <strong>phantom</strong> surface for x-direction is xhbeam(=1cm) and y-direction is yhbeam(=1cm).3. Results obtained(a) Data <strong>of</strong> information <strong>of</strong> particle trajectories (egs5job.pic)(b) Calculated result (egs5job.out)27
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