Dear gate users,<br>I have questions about GATE voxel phantom dosimetry:<br><span style="background-color: rgb(255, 255, 0);">1-In GATE out put file for absorbed Dose, is it really in terms of cGy?</span><br><br>2-I defined a <span style="background-color: rgb(255, 255, 0);">Vacuum in phantom</span> but it has dose in output file, what is it's reason?<br>
<br>3-I used a simple spherical voxel phantom with <span style="background-color: rgb(102, 255, 255);">r=24.6 cm</span> filled with water and simulate it in <span style="background-color: rgb(102, 255, 255);">GATE4.0.0 in 1 Second. </span><br>
Then I defined a <span style="background-color: rgb(102, 255, 255);">50 MBq of 140 keV point source</span> in it's center. The sum of all voxel doses calculated in this sphere was <span style="background-color: rgb(51, 255, 255);">2.5718 cGy</span> (according to gate4.0.0 user's manual).<br>
<br>my calculation for <span style="background-color: rgb(255, 204, 0);">emitted energy was: (50e6)*(140e3*1.6e-19) Joule</span><br>and for absorbed energy: as D=E/m and water density is 1000 kg/m^3 then E=m*D. <br>so,<span style="background-color: rgb(255, 204, 0);"> E(absorbed energy)=(2.5718e-2)*(4/3*3.14*[r^3]*1000)</span><br>
Therefor absorbed Energy in voxel phantom is so larger than emitted energy from the point source in 1 second,whereas, absorbed energy is the part of emitted energy, is it true?<br>Help me to find out it's problem,please.<br>
<br><span style="background-color: rgb(255, 255, 0);">would any one send me a complete reliable macro for dosimetry with/without camera description?</span><br>-- <br>Ali Asghar Parach,Ph.D. student in Medical Physics,Tarbiat Modares University,Tehran,Iran<br>