[Rtk-users] How to make the comparison?

[Guangming Zang]

Hi Chao,

Thanks for your help.

Yes, it works. But I am still a little confused.

 In the example in wiki,
<http://wiki.openrtk.org/index.php/RTK/Examples/ADMMTVReconstruction>the
only input for  command rtkdrawgeometricphantom  is SheppLogan.txt, in
which , after I checked, the geometry information is not included. So I
thought I can generated any size of volume as I want. (for example, 64^3
volume dimension with spacing 1 or 1024^3 volume dimension with spacing 10)
why should  the   dimension *spacing (1*512=2*256=512)   should be fixed as
a  constant???


Briefly speaking,my question is , by using command rtkadmmtotalvariation or
rtkdrawgeometricphantom,
how can i generated a 128^3 dimension SheppLogan volume with spacing as 1
.  Is it possible for the SheppLogan.txt provided by this example  to make
it  ???

So could you help me to find the solution??

Thanks for your help, Chao.

With my best regards

Guangming

*Guangming Zang (Alex)*
*King Abdullah University of Science and Technology(KAUST)*
*University of Chinese Academy of Sciences(UCAS)*




2015-05-11 11:06 GMT+03:00 Chao Wu <wuchao04 at gmail.com>:

> Hi Guangming,
>
> If you half the spacing you need twice the dimension (in length, or 8
> times in volume) to cover the same area, i.e. --spacing 1 --dimension 512.
> Is this what you want?
>
> Regards,
> Chao
>
> 2015-05-10 22:50 GMT+02:00 Guangming Zang <guangming.zang at kaust.edu.sa>:
>
>> Hi all.
>> I have implemented SART algorithm with some optimizations.and i wanna to
>> make a comparison with the implementations in our RTK.
>> My questions are:
>> 1. how to use RTK to  generate the initial  volume(i.e., ground Truth )to
>> make the comparison?
>> 2. My answer to the question 1 is that maybe i can use rtkdrawgeometricphantom
>> to generate a reference volume. However,
>> I noticed that in  the ADMMTV example in RTK wiki page,
>> <http://wiki.openrtk.org/index.php/RTK/Examples/ADMMTVReconstruction>
>> when i use the default demand, it works well (both for rtkadmmtotalvariation
>> and rtkdrawgeometricphantom)
>> . But when i change the spacing from 2 to 1, and dimension as 128.
>> i.e. the commands
>> from
>> rtkdrawgeometricphantom --spacing 2 --dimension 256--phantomfile
>> SheppLogan.txt -o ref.mha
>> to
>>
>> rtkdrawgeometricphantom --spacing 1 --dimension 128 --phantomfile SheppLogan.txt -o ref.mha
>>
>> the volume's visualization(ref.mha) is wired .
>>
>> So can you help me to find what's going on or tell me a better way to make the comparison between RTK method and my implementations.
>>
>>
>> Thanks in advance and with my best regards
>>
>> Guangming
>>
>>
>> *Guangming Zang (Alex)*
>> *King Abdullah University of Science and Technology(KAUST)*
>> *University of Chinese Academy of Sciences(UCAS)*
>>
>>
>>
>>
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