[Rtk-users] Reconstructing DICOM data

[Sreejith P P]

Hi Simon,

Thank you very much for your quick response.
As suggested, I have refined the Ankle Dicom data so that everything
outside the leg part is at 0. I got a fine projection 'Ankle.mha' after
doing that.
However, I didn't get much effect when I reconstructed it using rtkfdk. I
understand that projecting and reconstructing a CT image will necessarily
result in a loss of quality due to the multiple interpolations. But I
doubt, maybe something I am missing here can make it better. Could you have
a look at it, please?

I used the following command for reconstruction.
*rtkfdk -g geometry.xml -o Output.mha -p . -r Ankle.mha --dimension
512,512,245 --hardware cuda --hann 0.4 --hannY 0.4*

 Ankle.mha
<https://drive.google.com/file/d/1M5hey85gQhh_gCC1dEvvr_EsXkRAOWm3/view?usp=drive_web>
 AnkleDICOM.mha
<https://drive.google.com/file/d/14qcXeN3IL_qHT3IbiJfMaQrTIPIPu81v/view?usp=drive_web>
 geoemtry.xml
<https://drive.google.com/file/d/105dwnd8dqgeE2d0qz9I9FPzH1t5b2gcc/view?usp=drive_web>
 output.mha
<https://drive.google.com/file/d/11COT9G6jzrHALPvUs8N4jnnZt9kuIMd3/view?usp=drive_web>

Regards,
Sreejith

On Tue, Sep 20, 2022 at 12:44 PM Simon Rit <simon.rit at creatis.insa-lyon.fr>
wrote:

> Hi,
> Your projections in Ankle.mha display a very large value in air. To start
> with, I would make sure that everything outside the leg is at about 0 in
> your original Ankle CT data.
> Note that projecting and reconstructing a CT image will necessarily result
> in a loss of quality due to the multiple interpolations (during projection
> and backprojection). I would suggest to use fine pixels in the projections
> (e.g. --spacing .25) which you can bin during reconstruction (--binning
> 4,4).
> Simon
>
> On Mon, Sep 19, 2022 at 6:06 PM Sreejith P P <sreejithputhettu at gmail.com>
> wrote:
>
>> Hi,
>>
>> I have created projections from 'Ankle' CT data using RTK (cuda
>> projection filter). It looks good to me.
>> After that, I tried rtkfdk application to reconstruct it.
>> I used the following command and got the attached output.
>>
>> *rtkfdk -g geometry.xml -o Output.mha -p . -r Ankle.mha --dimension
>> 512,512,245 --hardware cuda --pad 1.0 --hann 0.4 --hannY 0.4*
>>
>> Am I doing it correctly? If yes, I would like to know what I can do to
>> improve the result.
>>
>>  Ankle.mha
>> <https://drive.google.com/file/d/10ybESn9HoU9_LYDgaLUNYIf2BzTarQij/view?usp=drive_web>
>>  geometry.xml
>> <https://drive.google.com/file/d/1cTlvPld3iRNiRUW8HmnF29i_j6AmzaPW/view?usp=drive_web>
>>  Output.mha
>> <https://drive.google.com/file/d/1iI9V9TUIAKUMyfe-w6TTzFzS0DzvaGyn/view?usp=drive_web>
>>
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>
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