[Gate-users] Standard HU ranges for Abdomen and Brain CT images

[Atiq Ur Rahman]

Hi Maria Inês,
Thank you so much for your feedback.
 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.
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?
Regards
Atiq

On Thu, Apr 8, 2021 at 4:57 PM Maria Inês Ribeiro <
mid.ribeiro at campus.fct.unl.pt> wrote:

> Hi Atiq,
>
> I am doing something similar for dosimetry purposes.
> 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.
>
> I would let the experts add more to what I said.
>
> Best,
>
> Inês
>
> Atiq Ur Rahman <atiqchep at gmail.com> escreveu no dia quinta, 8/04/2021
> à(s) 08:47:
>
>> Dear  experts,
>> 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.
>> For example, I am using this file for Abdomen CT:
>> -1024  -600 Air
>> -600   -120   Adipose
>> -120   -90    TissueEquivalent
>> -90     1     Blood
>> 1      10     Mucus
>> 10     20     Intestine
>> 20     30     Kidney
>> 30    40      Pancreas
>> 40     50     Spleen
>> 50     200    Liver
>> 200    400    SpangyBone
>> 400   3072  SpineBone
>>  Can anyone point me to some standard material conversion files or
>> resources with HU ranges?
>> Looking forward to any feedback.
>> Regards
>> Atiq
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>
>
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