<div dir="ltr">Hello Khalid,<div><br></div><div>I am not sure why you set activity twice in both the .dat file and the macro. But from my experience, if you are using voxelized phantom for simulation and try to attach some specific activity value to voxels, you just need to set the activity in the .dat file ( need to notice that the default unit in the .dat file is Bq). </div><div><br></div><div>So, let me assume that you are attaching all your activity to voxels with label 7 as you showed in the image and all your phantom voxels are labeled as 7 (because you didn't mention the constitution). The total activity level of 32.928 mCi, which is ~ 1218 MBq will be attached to all voxels of your phantom matrix evenly. 1218 MBq/6388800 ~= 191 Bq/voxel. But for most scenarios, you do not want to just assign all voxels with single activity level. You need to reference some papers about some specific scenarios you would like to study and attach different activity levels to different tissues.</div><div><br></div><div>Hope this helps!</div><div><br></div><div>Best,</div><div>Xinjie</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Oct 10, 2021 at 4:30 AM Khalid Hussain <<a href="mailto:khalidhussain1134@gmail.com">khalidhussain1134@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Dear Gate Users,<div><br></div><div>I am using a voxel source and have defined the activity of each voxel in the activity.dat file.</div><div>Here I have a question about the total number of particles. If I look at the stat file, activity file, and source files, and cannot be sure how the activity is working on and being calculated.</div><div>My voxel image has dimensions of 220x220x132 with 0.5mm^3 voxel size and the total number of voxels is 6388800 and the volume is 411.601cm^3 and I want to assign 80nCi/cm^3 activity to my voxel source. Mathematically the total activity which should I give to the voxelized source is 32.928133 mCi but I need your guidance on how can I assign this activity to my voxelized source.</div><div><br></div><div>I checked by changing the source activity probably not influencing the total number of particles.</div><div><br></div><div>Please advise</div><div><br></div><div><img src="cid:ii_kukybpot3" alt="image.png" width="521" height="187"><br><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><img src="cid:ii_kukxpvuu1" alt="image.png" width="521" height="214"><br></div><div><br></div><div><img src="cid:ii_kuky7w6b2" alt="image.png" width="521" height="179"><br></div><div><br></div><div><br></div><div>Regards</div><div><br></div><div><div><font color="#666666"><b>KHALID HUSSAIN </b>|</font> <font color="#bf9000"><b>PhD Scholar</b></font></div><div><font color="#073763" face="times new roman, serif"><b>Universiti Putra Malaysia (UPM), Malaysia</b></font></div><div><font face="times new roman, serif">Email:<a href="mailto:hussain.khalid@student.upm.edu.my" target="_blank">hussain.khalid@student.upm.edu.my</a></font></div><div><font face="times new roman, serif">Cell: <font color="#0000ff"><u>+60-11-6455-2354</u></font></font></div></div></div></div></div></div></div></div></div></div>
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<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" rel="noreferrer" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><b><font color="#000000">....................................................</font></b><br></div><div><b><span style="color:rgb(153,0,0);font-family:"arial black",sans-serif;font-size:x-small">Xinjie Cao</span></b><br></div><div><b><font size="1" face="arial black, sans-serif">M.Eng. / Ph.D. Candidate</font></b></div><div><b><font size="1" face="arial black, sans-serif">Research Project Assistant</font></b></div><div><b><font size="1" face="arial black, sans-serif">Department of Electrical and Computer Engineering & Radiology </font></b></div><div><b><font size="1" face="arial black, sans-serif">Novel Medical Imaging Technologies Lab</font></b></div><div><b><font size="1" face="arial black, sans-serif">Health Science Center Level 8</font></b></div><div><b><font size="1" face="arial black, sans-serif">Stony Brook, NY 11794-8460 </font></b></div><div><b><font size="1" face="arial black, sans-serif">Tel: +1 (631)202-9445</font></b></div><div><a href="https://you.stonybrook.edu/goldan/people/" target="_blank">you.stonybrook.edu/goldan/people/</a><b><font size="1" face="arial black, sans-serif"><br></font></b></div><div><font size="1" face="arial black, sans-serif"><b>email: </b><a href="mailto:xinjie.cao@stonybrook.edu" target="_blank"><b>xinjie.cao@stonybroo</b>k.edu</a></font></div><div><font size="1" face="arial black, sans-serif"><br></font></div><div><font size="1" face="arial black, sans-serif"> </font><img src="https://docs.google.com/uc?export=download&id=12iMPAuaMtpKRdkcmBleVsP6iWiM4wlm_&revid=0B_TLWOu4jP1eWnFFRW9qQXlicTY3ZTVzWnR5QkRVY3RRT3JVPQ" width="200" height="28"> <img src="https://drive.google.com/a/stonybrook.edu/uc?id=17TB1Ha3enD8HC5e_Ez238vpeBF92aCgH&export=download" width="200" height="33"></div><div><div><b><font color="#000000">....................................................</font></b></div></div></div></div></div></div></div></div></div></div></div></div></div>