[Rtk-users] Isocenter question

[Simon Rit]

Hi,
No idea. I would try to pop the question on the itk mailing list, I believe
that someone defined this file format.
Thanks for reporting that this solved this issue,
Simon

On Thu, Feb 4, 2016 at 7:06 PM, Solomon Tang <solomoncztang at gmail.com>
wrote:

> Hi Simon,
>
> Thanks for the quick reply. This solved the issue I was having. I simply
> changed the offset value in the mhd file, created the projection and moved
> the offset value of the final reconstruction back to its original value so
> the world coordinates would be the same.
>
> Just as a side question, do you know what the center of rotation values
> are used for in mhd files? They're all 0 0 0 and I am not noticing any
> differences when I change the values.
>
> On Wed, Feb 3, 2016 at 10:14 PM, Simon Rit <simon.rit at creatis.insa-lyon.fr
> > wrote:
>
>> Hi,
>> If you want to move a volume around space and keep the same geometry for
>> the source and detector positions, the best is to modify the origin of your
>> itk image. I don't know what is the original file format but with mhd
>> files, you simply have to change the Offset value in the mhd file.
>> Good luck,
>> Simon
>>
>>
>> On 04/02/2016 00:25, Solomon Tang wrote:
>>
>> Dear rtk-users,
>>
>> I am having success with forward projection and reconstruction of
>> complete cases much like in the example from the wiki. However, I am
>> interested in creating projections of cropped images. I took the 00.mha
>> from the example and cropped it. When I create the projection, using
>> rtkforwardprojections, the cropped projection rotates around the isocenter
>> of the original uncropped file around the AP axis as expected.
>>
>> Is there a way to create a projection of a cropped image such that the
>> cropped projection rotates around a newly centered AP axis?
>>
>> I am certain that the origin and spacing values of the geometry are
>> correct. I have tried messing with the sid and the sdd values but they do
>> not influence the distance between the isocenter and the cropped object.
>>
>> Thanks
>>
>>
>> _______________________________________________
>> Rtk-users mailing listRtk-users at public.kitware.comhttp://public.kitware.com/mailman/listinfo/rtk-users
>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/rtk-users/attachments/20160204/13d95112/attachment-0010.html>