<div dir="ltr">Hi Maria Inês,<div>Thank you so much for your feedback. </div><div> The purpose of using CT is to incorporate inhomogeneity in the human body and targets. In my opinion, setting long intervals may affect the actual motive. otherwise, the material may become a phantom of discrete materials (which also become in case of very small bins too) with sharp variations on interfaces of the HU which may take the whole practice of simulation very far from the real situations. </div><div>Secondly, I have a question about the HU unit ranges. By the way, from which resource do you use these range numbers for different organs. Do you have a standard list for that? Do you mind sharing this information or point to me! Because my background knowledge about CT and Human organs is really poor! How can I solve this problem? </div><div>Regards</div><div>Atiq</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 8, 2021 at 4:57 PM Maria Inês Ribeiro <<a href="mailto:mid.ribeiro@campus.fct.unl.pt">mid.ribeiro@campus.fct.unl.pt</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">Hi Atiq, <div><br></div><div>I am doing something similar for dosimetry purposes. </div><div>From what I have read, the HU depends on the CT scanner that acquired the images. For dosimetry, it is not necessary to produce such small bins (as in your example) because there is not a good relationship between CT unit and tissue composition in the range of soft tissues and dose does not differ much within them. </div><div><br></div><div>I would let the experts add more to what I said. </div><div><br></div><div>Best, </div><div><br></div><div>Inês</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Atiq Ur Rahman <<a href="mailto:atiqchep@gmail.com" target="_blank">atiqchep@gmail.com</a>> escreveu no dia quinta, 8/04/2021 à(s) 08:47:<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 experts,<div>I am trying to read the CT images in Gate. I am successful to read the CT Image but I am not sure about the precise organ density ranges in HU units for Abdomen and Brain CT images. Right now, I am trying to implement it from different online research papers and websites but that may not be a standard Benchmark.</div><div>For example, I am using this file for Abdomen CT:</div><div>-1024 -600 Air<br>-600 -120 Adipose<br>-120 -90 TissueEquivalent<br>-90 1 Blood<br>1 10 Mucus<br>10 20 Intestine<br>20 30 Kidney<br>30 40 Pancreas<br>40 50 Spleen<br>50 200 Liver<br>200 400 SpangyBone<br>400 3072 SpineBone<br></div><div> Can anyone point me to some standard material conversion files or resources with HU ranges? <br></div><div>Looking forward to any feedback.</div><div></div><div>Regards</div><div>Atiq </div></div>
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